diff --git a/packages/core/utils/src/content-types.ts b/packages/core/utils/src/content-types.ts
index 8be72b317a..b00fd577f4 100644
--- a/packages/core/utils/src/content-types.ts
+++ b/packages/core/utils/src/content-types.ts
@@ -1,6 +1,13 @@
 import _ from 'lodash';
 import { has } from 'lodash/fp';
-import type { Model, Kind, Attribute, RelationalAttribute } from './types';
+import type {
+  Model,
+  Kind,
+  Attribute,
+  RelationalAttribute,
+  ComponentAttribute,
+  DynamicZoneAttribute,
+} from './types';
 
 const SINGLE_TYPE = 'singleType';
 const COLLECTION_TYPE = 'collectionType';
@@ -113,10 +120,11 @@ const isMediaAttribute = (attribute: Attribute) => attribute?.type === 'media';
 const isRelationalAttribute = (attribute: Attribute): attribute is RelationalAttribute =>
   attribute?.type === 'relation';
 
-const isComponentAttribute = (attribute: Attribute) =>
+const isComponentAttribute = (attribute: Attribute): attribute is ComponentAttribute =>
   ['component', 'dynamiczone'].includes(attribute?.type);
 
-const isDynamicZoneAttribute = (attribute: Attribute) => attribute?.type === 'dynamiczone';
+const isDynamicZoneAttribute = (attribute: Attribute): attribute is DynamicZoneAttribute =>
+  attribute?.type === 'dynamiczone';
 const isMorphToRelationalAttribute = (attribute: Attribute) => {
   return isRelationalAttribute(attribute) && attribute?.relation?.startsWith?.('morphTo');
 };
diff --git a/packages/core/utils/src/convert-query-params.js b/packages/core/utils/src/convert-query-params.ts
similarity index 76%
rename from packages/core/utils/src/convert-query-params.js
rename to packages/core/utils/src/convert-query-params.ts
index efc279535e..2486eb3fea 100644
--- a/packages/core/utils/src/convert-query-params.js
+++ b/packages/core/utils/src/convert-query-params.ts
@@ -1,36 +1,88 @@
+/* eslint-disable @typescript-eslint/naming-convention */
 /* eslint-disable max-classes-per-file */
 
-'use strict';
-
 /**
  * Converts the standard Strapi REST query params to a more usable format for querying
  * You can read more here: https://docs.strapi.io/developer-docs/latest/developer-resources/database-apis-reference/rest-api.html#filters
  */
 
-const {
+import {
   isNil,
   toNumber,
   isInteger,
   has,
   isEmpty,
   isObject,
-  isPlainObject,
   cloneDeep,
   get,
   mergeAll,
-} = require('lodash/fp');
-const _ = require('lodash');
-const parseType = require('./parse-type');
-const contentTypesUtils = require('./content-types');
-const { PaginationError } = require('./errors');
-const {
+  isArray,
+  isString,
+} from 'lodash/fp';
+import _ from 'lodash';
+import parseType from './parse-type';
+import * as contentTypesUtils from './content-types';
+import { PaginationError } from './errors';
+import {
   isMediaAttribute,
   isDynamicZoneAttribute,
   isMorphToRelationalAttribute,
-} = require('./content-types');
+} from './content-types';
+import { Model } from './types';
 
 const { PUBLISHED_AT_ATTRIBUTE } = contentTypesUtils.constants;
 
+type SortOrder = 'asc' | 'desc';
+
+interface SortMap {
+  [key: string]: SortOrder | SortMap;
+}
+
+type SortQuery = string | string[] | object;
+
+type FieldsQuery = string | string[];
+interface FiltersQuery {}
+
+type PopulateParams = {
+  sort?: SortQuery;
+  fields?: FieldsQuery;
+  filters?: FiltersQuery;
+  populate?: PopulateQuery;
+  on: {
+    [key: string]: PopulateParams;
+  };
+};
+
+type PopulateQuery = string | string[] | PopulateParams;
+
+interface Query {
+  sort?: SortQuery;
+  fields?: FieldsQuery;
+  filters?: FiltersQuery;
+  populate?: PopulateQuery;
+  count: boolean;
+  ordering: unknown;
+  _q?: string;
+  limit?: number | string;
+  start?: number | string;
+  page?: number | string;
+  pageSize?: number | string;
+}
+
+interface ConvertedQuery {
+  orderBy?: SortQuery;
+  select?: FieldsQuery;
+  where?: FiltersQuery;
+  populate?: PopulateQuery;
+  count: boolean;
+  ordering: unknown;
+  _q?: string;
+  limit?: number;
+  offset?: number;
+  page?: number;
+  pageSize?: number;
+}
+
 class InvalidOrderError extends Error {
   constructor() {
     super();
@@ -45,41 +97,47 @@ class InvalidSortError extends Error {
   }
 }
 
-const validateOrder = (order) => {
+function validateOrder(order: string): asserts order is SortOrder {
   if (!['asc', 'desc'].includes(order.toLocaleLowerCase())) {
     throw new InvalidOrderError();
   }
-};
+}
 
-const convertCountQueryParams = (countQuery) => {
+const convertCountQueryParams = (countQuery: unknown): boolean => {
   return parseType({ type: 'boolean', value: countQuery });
 };
 
-const convertOrderingQueryParams = (ordering) => {
+const convertOrderingQueryParams = (ordering: unknown) => {
   return ordering;
 };
 
+const isPlainObject = (value: unknown): value is Record<string, unknown> => _.isPlainObject(value);
+const isStringArray = (value: unknown): value is string[] =>
+  isArray(value) && value.every(isString);
+
 /**
  * Sort query parser
- * @param {string} sortQuery - ex: id:asc,price:desc
  */
-const convertSortQueryParams = (sortQuery) => {
+const convertSortQueryParams = (sortQuery: SortQuery): SortMap | SortMap[] => {
   if (typeof sortQuery === 'string') {
-    return sortQuery.split(',').map((value) => convertSingleSortQueryParam(value));
+    return convertStringSortQueryParam(sortQuery);
+  }
+  if (isStringArray(sortQuery)) {
+    return sortQuery.flatMap((sortValue: string) => convertStringSortQueryParam(sortValue));
   }
 
-  if (Array.isArray(sortQuery)) {
-    return sortQuery.flatMap((sortValue) => convertSortQueryParams(sortValue));
-  }
-
-  if (_.isPlainObject(sortQuery)) {
+  if (isPlainObject(sortQuery)) {
     return convertNestedSortQueryParam(sortQuery);
   }
 
   throw new InvalidSortError();
 };
 
-const convertSingleSortQueryParam = (sortQuery) => {
+const convertStringSortQueryParam = (sortQuery: string): SortMap[] => {
+  return sortQuery.split(',').map((value) => convertSingleSortQueryParam(value));
+};
+
+const convertSingleSortQueryParam = (sortQuery: string): SortMap => {
   // split field and order param with default order to ascending
   const [field, order = 'asc'] = sortQuery.split(':');
 
@@ -92,17 +150,19 @@ const convertSingleSortQueryParam = (sortQuery) => {
   return _.set({}, field, order);
 };
 
-const convertNestedSortQueryParam = (sortQuery) => {
-  const transformedSort = {};
+const convertNestedSortQueryParam = (sortQuery: Record<string, unknown>): SortMap => {
+  const transformedSort: SortMap = {};
   for (const field of Object.keys(sortQuery)) {
     const order = sortQuery[field];
 
     // this is a deep sort
-    if (_.isPlainObject(order)) {
+    if (isPlainObject(order)) {
       transformedSort[field] = convertNestedSortQueryParam(order);
-    } else {
+    } else if (typeof order === 'string') {
       validateOrder(order);
       transformedSort[field] = order;
+    } else {
+      throw Error(`Invalid sort type expected object or string got ${typeof order}`);
     }
   }
 
@@ -111,9 +171,8 @@ const convertNestedSortQueryParam = (sortQuery) => {
 
 /**
  * Start query parser
- * @param {string} startQuery
  */
-const convertStartQueryParams = (startQuery) => {
+const convertStartQueryParams = (startQuery: unknown): number => {
   const startAsANumber = _.toNumber(startQuery);
 
   if (!_.isInteger(startAsANumber) || startAsANumber < 0) {
@@ -125,21 +184,22 @@ const convertStartQueryParams = (startQuery) => {
 
 /**
  * Limit query parser
- * @param {string} limitQuery
  */
-const convertLimitQueryParams = (limitQuery) => {
+const convertLimitQueryParams = (limitQuery: unknown): number | undefined => {
   const limitAsANumber = _.toNumber(limitQuery);
 
   if (!_.isInteger(limitAsANumber) || (limitAsANumber !== -1 && limitAsANumber < 0)) {
     throw new Error(`convertLimitQueryParams expected a positive integer got ${limitAsANumber}`);
   }
 
-  if (limitAsANumber === -1) return null;
+  if (limitAsANumber === -1) {
+    return undefined;
+  }
 
   return limitAsANumber;
 };
 
-const convertPageQueryParams = (page) => {
+const convertPageQueryParams = (page: unknown): number => {
   const pageVal = toNumber(page);
 
   if (!isInteger(pageVal) || pageVal <= 0) {
@@ -151,7 +211,7 @@ const convertPageQueryParams = (page) => {
   return pageVal;
 };
 
-const convertPageSizeQueryParams = (pageSize, page) => {
+const convertPageSizeQueryParams = (pageSize: unknown, page: unknown): number => {
   const pageSizeVal = toNumber(pageSize);
 
   if (!isInteger(pageSizeVal) || pageSizeVal <= 0) {
@@ -163,7 +223,12 @@ const convertPageSizeQueryParams = (pageSize, page) => {
   return pageSizeVal;
 };
 
-const validatePaginationParams = (page, pageSize, start, limit) => {
+const validatePaginationParams = (
+  page: unknown,
+  pageSize: unknown,
+  start: unknown,
+  limit: unknown
+) => {
   const isPagePagination = !isNil(page) || !isNil(pageSize);
   const isOffsetPagination = !isNil(start) || !isNil(limit);
 
@@ -183,7 +248,7 @@ class InvalidPopulateError extends Error {
 }
 
 // NOTE: we could support foo.* or foo.bar.* etc later on
-const convertPopulateQueryParams = (populate, schema, depth = 0) => {
+const convertPopulateQueryParams = (populate: PopulateQuery, schema: Model, depth = 0) => {
   if (depth === 0 && populate === '*') {
     return true;
   }
@@ -212,7 +277,7 @@ const convertPopulateQueryParams = (populate, schema, depth = 0) => {
   throw new InvalidPopulateError();
 };
 
-const convertPopulateObject = (populate, schema) => {
+const convertPopulateObject = (populate: PopulateParams, schema: Model) => {
   if (!schema) {
     return {};
   }
@@ -252,7 +317,7 @@ const convertPopulateObject = (populate, schema) => {
 
     // TODO: This is a query's populate fallback for DynamicZone and is kept for legacy purpose.
     //       Removing it could break existing user queries but it should be removed in V5.
-    if (attribute.type === 'dynamiczone') {
+    if (isDynamicZoneAttribute(attribute)) {
       const populates = attribute.components
         .map((uid) => strapi.getModel(uid))
         .map((schema) => convertNestedPopulate(subPopulate, schema))
@@ -303,7 +368,7 @@ const convertPopulateObject = (populate, schema) => {
   }, {});
 };
 
-const convertNestedPopulate = (subPopulate, schema) => {
+const convertNestedPopulate = (subPopulate: PopulateQuery, schema: Model) => {
   if (_.isString(subPopulate)) {
     return parseType({ type: 'boolean', value: subPopulate, forceCast: true });
   }
@@ -319,7 +384,7 @@ const convertNestedPopulate = (subPopulate, schema) => {
   const { sort, filters, fields, populate, count, ordering, page, pageSize, start, limit } =
     subPopulate;
 
-  const query = {};
+  const query: ConvertedQuery = {};
 
   if (sort) {
     query.orderBy = convertSortQueryParams(sort);
@@ -368,7 +433,7 @@ const convertNestedPopulate = (subPopulate, schema) => {
   return query;
 };
 
-const convertFieldsQueryParams = (fields, depth = 0) => {
+const convertFieldsQueryParams = (fields: FieldsQuery, depth = 0): string[] | undefined => {
   if (depth === 0 && fields === '*') {
     return undefined;
   }
@@ -378,16 +443,19 @@ const convertFieldsQueryParams = (fields, depth = 0) => {
     return _.uniq(['id', ...fieldsValues]);
   }
 
-  if (Array.isArray(fields)) {
+  if (isStringArray(fields)) {
     // map convert
-    const fieldsValues = fields.flatMap((value) => convertFieldsQueryParams(value, depth + 1));
+    const fieldsValues = fields
+      .flatMap((value) => convertFieldsQueryParams(value, depth + 1))
+      .filter((v) => !isNil(v)) as string[];
+
     return _.uniq(['id', ...fieldsValues]);
   }
 
   throw new Error('Invalid fields parameter. Expected a string or an array of strings');
 };
 
-const convertFiltersQueryParams = (filters, schema) => {
+const convertFiltersQueryParams = (filters: FiltersQuery, schema: Model) => {
   // Filters need to be either an array or an object
   // Here we're only checking for 'object' type since typeof [] => object and typeof {} => object
   if (!isObject(filters)) {
@@ -400,7 +468,7 @@ const convertFiltersQueryParams = (filters, schema) => {
   return convertAndSanitizeFilters(filtersCopy, schema);
 };
 
-const convertAndSanitizeFilters = (filters, schema) => {
+const convertAndSanitizeFilters = (filters: FiltersQuery, schema: Model) => {
   if (!isPlainObject(filters)) {
     return filters;
   }
@@ -415,7 +483,7 @@ const convertAndSanitizeFilters = (filters, schema) => {
     );
   }
 
-  const removeOperator = (operator) => delete filters[operator];
+  const removeOperator = (operator: string) => delete filters[operator];
 
   // Here, `key` can either be an operator or an attribute name
   for (const [key, value] of Object.entries(filters)) {
@@ -494,11 +562,11 @@ const convertPublicationStateParams = (type, params = {}, query = {}) => {
   }
 };
 
-const transformParamsToQuery = (uid, params) => {
+const transformParamsToQuery = (uid: string, params: Query) => {
   // NOTE: can be a CT, a Compo or nothing in the case of polymorphism (DZ & morph relations)
   const schema = strapi.getModel(uid);
 
-  const query = {};
+  const query: ConvertedQuery = {};
 
   const { _q, sort, filters, fields, populate, page, pageSize, start, limit } = params;
 
@@ -545,7 +613,7 @@ const transformParamsToQuery = (uid, params) => {
   return query;
 };
 
-module.exports = {
+export = {
   convertSortQueryParams,
   convertStartQueryParams,
   convertLimitQueryParams,
diff --git a/packages/core/utils/src/parse-type.ts b/packages/core/utils/src/parse-type.ts
index 53f2cdd45b..68d8dbabcf 100644
--- a/packages/core/utils/src/parse-type.ts
+++ b/packages/core/utils/src/parse-type.ts
@@ -7,7 +7,7 @@ const isDate = (v: unknown): v is Date => {
   return dates.isDate(v);
 };
 
-const parseTime = (value: string | Date) => {
+const parseTime = (value: string | Date): string => {
   if (isDate(value)) {
     return dates.format(value, 'HH:mm:ss.SSS');
   }
@@ -61,8 +61,20 @@ const parseDateTimeOrTimestamp = (value: string | Date) => {
   }
 };
 
+type TypeMap = {
+  boolean: boolean;
+  integer: number;
+  biginteger: number;
+  float: number;
+  decimal: number;
+  time: string;
+  date: string;
+  timestamp: Date;
+  datetime: Date;
+};
+
 interface ParseTypeOptions {
-  type: string;
+  type: keyof TypeMap;
   value: any;
   forceCast?: boolean;
 }
@@ -70,10 +82,14 @@ interface ParseTypeOptions {
 /**
  * Cast basic values based on attribute type
  */
-const parseType = ({ type, value, forceCast = false }: ParseTypeOptions) => {
+const parseType = (options: ParseTypeOptions) => {
+  const { type, value, forceCast = false } = options;
+
   switch (type) {
     case 'boolean': {
-      if (typeof value === 'boolean') return value;
+      if (typeof value === 'boolean') {
+        return value;
+      }
 
       if (['true', 't', '1', 1].includes(value)) {
         return true;
@@ -110,4 +126,4 @@ const parseType = ({ type, value, forceCast = false }: ParseTypeOptions) => {
   }
 };
 
-module.exports = parseType;
+export default parseType;
diff --git a/packages/core/utils/src/sanitize/index.ts b/packages/core/utils/src/sanitize/index.ts
index ab8a6ef36a..5f9021605b 100644
--- a/packages/core/utils/src/sanitize/index.ts
+++ b/packages/core/utils/src/sanitize/index.ts
@@ -1,3 +1,4 @@
+import { CurriedFunction1 } from 'lodash';
 import { isArray, cloneDeep } from 'lodash/fp';
 
 import { getNonWritableAttributes } from '../content-types';
@@ -5,13 +6,24 @@ import { pipeAsync } from '../async';
 
 import * as visitors from './visitors';
 import * as sanitizers from './sanitizers';
-import traverseEntity from '../traverse-entity';
+import traverseEntity, { Data } from '../traverse-entity';
 
 import { traverseQueryFilters, traverseQuerySort, traverseQueryPopulate } from '../traverse';
 import { Model } from '../types';
 
+interface Options {
+  auth?: unknown;
+}
+
+interface Sanitizer {
+  (schema: Model): CurriedFunction1<Data, Promise<Data>>;
+}
+export interface SanitizeFunc {
+  (data: unknown, schema: Model, options?: Options): Promise<unknown>;
+}
+
 const createContentAPISanitizers = () => {
-  const sanitizeInput = (data, schema: Model, { auth } = {}) => {
+  const sanitizeInput: SanitizeFunc = (data: unknown, schema: Model, { auth } = {}) => {
     if (isArray(data)) {
       return Promise.all(data.map((entry) => sanitizeInput(entry, schema, { auth })));
     }
@@ -31,12 +43,12 @@ const createContentAPISanitizers = () => {
     // Apply sanitizers from registry if exists
     strapi.sanitizers
       .get('content-api.input')
-      .forEach((sanitizer) => transforms.push(sanitizer(schema)));
+      .forEach((sanitizer: Sanitizer) => transforms.push(sanitizer(schema)));
 
     return pipeAsync(...transforms)(data);
   };
 
-  const sanitizeOutput = async (data, schema: Model, { auth } = {}) => {
+  const sanitizeOutput: SanitizeFunc = async (data, schema: Model, { auth } = {}) => {
     if (isArray(data)) {
       const res = new Array(data.length);
       for (let i = 0; i < data.length; i += 1) {
@@ -45,7 +57,7 @@ const createContentAPISanitizers = () => {
       return res;
     }
 
-    const transforms = [(data) => sanitizers.defaultSanitizeOutput(schema, data)];
+    const transforms = [(data: Data) => sanitizers.defaultSanitizeOutput(schema, data)];
 
     if (auth) {
       transforms.push(traverseEntity(visitors.removeRestrictedRelations(auth), { schema }));
@@ -54,12 +66,16 @@ const createContentAPISanitizers = () => {
     // Apply sanitizers from registry if exists
     strapi.sanitizers
       .get('content-api.output')
-      .forEach((sanitizer) => transforms.push(sanitizer(schema)));
+      .forEach((sanitizer: Sanitizer) => transforms.push(sanitizer(schema)));
 
     return pipeAsync(...transforms)(data);
   };
 
-  const sanitizeQuery = async (query, schema, { auth } = {}) => {
+  const sanitizeQuery = async (
+    query: Record<string, unknown>,
+    schema: Model,
+    { auth }: Options = {}
+  ) => {
     const { filters, sort, fields, populate } = query;
 
     const sanitizedQuery = cloneDeep(query);
@@ -83,7 +99,7 @@ const createContentAPISanitizers = () => {
     return sanitizedQuery;
   };
 
-  const sanitizeFilters = (filters, schema: Model, { auth } = {}) => {
+  const sanitizeFilters: SanitizeFunc = (filters, schema: Model, { auth } = {}) => {
     if (isArray(filters)) {
       return Promise.all(filters.map((filter) => sanitizeFilters(filter, schema, { auth })));
     }
@@ -97,7 +113,7 @@ const createContentAPISanitizers = () => {
     return pipeAsync(...transforms)(filters);
   };
 
-  const sanitizeSort = (sort, schema: Model, { auth } = {}) => {
+  const sanitizeSort: SanitizeFunc = (sort, schema: Model, { auth } = {}) => {
     const transforms = [sanitizers.defaultSanitizeSort(schema)];
 
     if (auth) {
@@ -107,13 +123,13 @@ const createContentAPISanitizers = () => {
     return pipeAsync(...transforms)(sort);
   };
 
-  const sanitizeFields = (fields, schema: Model) => {
+  const sanitizeFields: SanitizeFunc = (fields, schema: Model) => {
     const transforms = [sanitizers.defaultSanitizeFields(schema)];
 
     return pipeAsync(...transforms)(fields);
   };
 
-  const sanitizePopulate = (populate, schema: Model, { auth } = {}) => {
+  const sanitizePopulate: SanitizeFunc = (populate, schema: Model, { auth } = {}) => {
     const transforms = [sanitizers.defaultSanitizePopulate(schema)];
 
     if (auth) {
diff --git a/packages/core/utils/src/sanitize/sanitizers.ts b/packages/core/utils/src/sanitize/sanitizers.ts
index a38a09e622..4fd9368a21 100644
--- a/packages/core/utils/src/sanitize/sanitizers.ts
+++ b/packages/core/utils/src/sanitize/sanitizers.ts
@@ -35,7 +35,7 @@ const defaultSanitizeOutput = async (schema: Model, entity: Data) => {
   );
 };
 
-const defaultSanitizeFilters = curry((schema: Model, filters) => {
+const defaultSanitizeFilters = curry((schema: Model, filters: unknown) => {
   return pipeAsync(
     // Remove dynamic zones from filters
     traverseQueryFilters(removeDynamicZones, { schema }),
@@ -57,7 +57,7 @@ const defaultSanitizeFilters = curry((schema: Model, filters) => {
   )(filters);
 });
 
-const defaultSanitizeSort = curry((schema: Model, sort) => {
+const defaultSanitizeSort = curry((schema: Model, sort: unknown) => {
   return pipeAsync(
     // Remove non attribute keys
     traverseQuerySort(
@@ -94,11 +94,11 @@ const defaultSanitizeSort = curry((schema: Model, sort) => {
   )(sort);
 });
 
-const defaultSanitizeFields = curry((schema: Model, fields) => {
+const defaultSanitizeFields = curry((schema: Model, fields: unknown) => {
   return pipeAsync(
     // Only keep scalar attributes
     traverseQueryFields(
-      ({ key, attribute }: , { remove }) => {
+      ({ key, attribute }, { remove }) => {
         if (isNil(attribute) || !isScalarAttribute(attribute)) {
           remove(key);
         }
@@ -114,7 +114,7 @@ const defaultSanitizeFields = curry((schema: Model, fields) => {
   )(fields);
 });
 
-const defaultSanitizePopulate = curry((schema: Model, populate) => {
+const defaultSanitizePopulate = curry((schema: Model, populate: unknown) => {
   return pipeAsync(
     traverseQueryPopulate(
       async ({ key, value, schema, attribute }, { set }) => {
diff --git a/packages/core/utils/src/sanitize/visitors/allowed-fields.ts b/packages/core/utils/src/sanitize/visitors/allowed-fields.ts
index 85254aa541..3f6f865349 100644
--- a/packages/core/utils/src/sanitize/visitors/allowed-fields.ts
+++ b/packages/core/utils/src/sanitize/visitors/allowed-fields.ts
@@ -1,5 +1,5 @@
 import { isArray, isNil, toPath } from 'lodash/fp';
-import { Visitor } from '../../traverse-entity';
+import type { Visitor } from '../../traverse/factory';
 
 export default (allowedFields: string[] | null = null): Visitor =>
   ({ key, path: { attribute: path } }, { remove }) => {
diff --git a/packages/core/utils/src/sanitize/visitors/remove-dynamic-zones.ts b/packages/core/utils/src/sanitize/visitors/remove-dynamic-zones.ts
index 50ff254140..97a7e28b62 100644
--- a/packages/core/utils/src/sanitize/visitors/remove-dynamic-zones.ts
+++ b/packages/core/utils/src/sanitize/visitors/remove-dynamic-zones.ts
@@ -1,5 +1,5 @@
 import { isDynamicZoneAttribute } from '../../content-types';
-import type { Visitor } from '../../traverse-entity';
+import type { Visitor } from '../../traverse/factory';
 
 const visitor: Visitor = ({ key, attribute }, { remove }) => {
   if (isDynamicZoneAttribute(attribute)) {
diff --git a/packages/core/utils/src/sanitize/visitors/remove-morph-to-relations.ts b/packages/core/utils/src/sanitize/visitors/remove-morph-to-relations.ts
index 08619e79bb..9b80ee06b0 100644
--- a/packages/core/utils/src/sanitize/visitors/remove-morph-to-relations.ts
+++ b/packages/core/utils/src/sanitize/visitors/remove-morph-to-relations.ts
@@ -1,5 +1,5 @@
 import { isMorphToRelationalAttribute } from '../../content-types';
-import type { Visitor } from '../../traverse-entity';
+import type { Visitor } from '../../traverse/factory';
 
 const visitor: Visitor = ({ key, attribute }, { remove }) => {
   if (isMorphToRelationalAttribute(attribute)) {
diff --git a/packages/core/utils/src/sanitize/visitors/remove-password.ts b/packages/core/utils/src/sanitize/visitors/remove-password.ts
index aeac896cfa..87f6280154 100644
--- a/packages/core/utils/src/sanitize/visitors/remove-password.ts
+++ b/packages/core/utils/src/sanitize/visitors/remove-password.ts
@@ -1,4 +1,4 @@
-import type { Visitor } from '../../traverse-entity';
+import type { Visitor } from '../../traverse/factory';
 
 const visitor: Visitor = ({ key, attribute }, { remove }) => {
   if (attribute?.type === 'password') {
diff --git a/packages/core/utils/src/sanitize/visitors/remove-private.ts b/packages/core/utils/src/sanitize/visitors/remove-private.ts
index eb55de187f..f545e06686 100644
--- a/packages/core/utils/src/sanitize/visitors/remove-private.ts
+++ b/packages/core/utils/src/sanitize/visitors/remove-private.ts
@@ -1,5 +1,5 @@
 import { isPrivateAttribute } from '../../content-types';
-import type { Visitor } from '../../traverse-entity';
+import type { Visitor } from '../../traverse/factory';
 
 const visitor: Visitor = ({ schema, key, attribute }, { remove }) => {
   if (!attribute) {
diff --git a/packages/core/utils/src/sanitize/visitors/remove-restricted-relations.ts b/packages/core/utils/src/sanitize/visitors/remove-restricted-relations.ts
index d7c64f6bee..706e0395f8 100644
--- a/packages/core/utils/src/sanitize/visitors/remove-restricted-relations.ts
+++ b/packages/core/utils/src/sanitize/visitors/remove-restricted-relations.ts
@@ -1,9 +1,11 @@
 import * as contentTypeUtils from '../../content-types';
-import type { Visitor } from '../../traverse-entity';
+import type { Visitor } from '../../traverse/factory';
 
 const ACTIONS_TO_VERIFY = ['find'];
 const { CREATED_BY_ATTRIBUTE, UPDATED_BY_ATTRIBUTE } = contentTypeUtils.constants;
 
+type MorphArray = Array<{ __type: string }>;
+
 export default (auth: unknown): Visitor =>
   async ({ data, key, attribute, schema }, { remove, set }) => {
     if (!attribute) {
@@ -19,7 +21,7 @@ export default (auth: unknown): Visitor =>
     const handleMorphRelation = async () => {
       const newMorphValue: Record<string, unknown>[] = [];
 
-      for (const element of data[key]) {
+      for (const element of (data as Record<string, MorphArray>)[key]) {
         const scopes = ACTIONS_TO_VERIFY.map((action) => `${element.__type}.${action}`);
         const isAllowed = await hasAccessToSomeScopes(scopes, auth);
 
diff --git a/packages/core/utils/src/sanitize/visitors/restricted-fields.ts b/packages/core/utils/src/sanitize/visitors/restricted-fields.ts
index 4ba95cc567..280adc8a6a 100644
--- a/packages/core/utils/src/sanitize/visitors/restricted-fields.ts
+++ b/packages/core/utils/src/sanitize/visitors/restricted-fields.ts
@@ -1,5 +1,5 @@
 import { isArray } from 'lodash/fp';
-import type { Visitor } from '../../traverse-entity';
+import type { Visitor } from '../../traverse/factory';
 
 export default (restrictedFields: string[] | null = null): Visitor =>
   ({ key, path: { attribute: path } }, { remove }) => {
diff --git a/packages/core/utils/src/traverse-entity.ts b/packages/core/utils/src/traverse-entity.ts
index 0dbd735dfc..8202b40fa7 100644
--- a/packages/core/utils/src/traverse-entity.ts
+++ b/packages/core/utils/src/traverse-entity.ts
@@ -1,6 +1,6 @@
 import { clone, isObject, isArray, isNil, curry } from 'lodash/fp';
 import { Attribute, Model } from './types';
-import { isRelationalAttribute, isMediaAttribute } from './content-types';
+import { isRelationalAttribute, isMediaAttribute, isComponentAttribute } from './content-types';
 
 export type VisitorUtils = ReturnType<typeof createVisitorUtils>;
 
@@ -154,7 +154,7 @@ const traverseEntity = async (visitor: Visitor, options: TraverseOptions, entity
       continue;
     }
 
-    if (attribute.type === 'component') {
+    if (isComponentAttribute(attribute)) {
       const targetSchema = strapi.getModel(attribute.component);
 
       if (isArray(value)) {
diff --git a/packages/core/utils/src/traverse/factory.ts b/packages/core/utils/src/traverse/factory.ts
index 8acb564eb6..d696cad90e 100644
--- a/packages/core/utils/src/traverse/factory.ts
+++ b/packages/core/utils/src/traverse/factory.ts
@@ -1,6 +1,12 @@
 /* eslint-disable @typescript-eslint/no-loop-func */
 import { isNil, pick } from 'lodash/fp';
-import { Attribute, Model, RelationalAttribute } from '../types';
+import {
+  Attribute,
+  ComponentAttribute,
+  DynamicZoneAttribute,
+  Model,
+  RelationalAttribute,
+} from '../types';
 
 export interface Path {
   raw: string | null;
@@ -89,6 +95,8 @@ interface State {
   };
 }
 
+const DEFAULT_PATH = { raw: null, attribute: null };
+
 export default () => {
   const state: State = {
     parsers: [],
@@ -100,8 +108,8 @@ export default () => {
     },
   };
 
-  const traverse: Traverse = async (visitor, options: TraverseOptions, data) => {
-    const { path = { raw: null, attribute: null }, schema } = options ?? {};
+  const traverse: Traverse = async (visitor, options, data) => {
+    const { path = DEFAULT_PATH, schema } = options ?? {};
 
     // interceptors
     for (const { predicate, handler } of state.interceptors) {
@@ -233,11 +241,11 @@ export default () => {
       return this.onAttribute(({ attribute }) => attribute?.type === 'media', handler);
     },
 
-    onComponent(handler: AttributeHandler<RelationalAttribute>['handler']) {
+    onComponent(handler: AttributeHandler<ComponentAttribute>['handler']) {
       return this.onAttribute(({ attribute }) => attribute?.type === 'component', handler);
     },
 
-    onDynamicZone(handler: AttributeHandler<RelationalAttribute>['handler']) {
+    onDynamicZone(handler: AttributeHandler<DynamicZoneAttribute>['handler']) {
       return this.onAttribute(({ attribute }) => attribute?.type === 'dynamiczone', handler);
     },
   };
diff --git a/packages/core/utils/src/traverse/query-filters.ts b/packages/core/utils/src/traverse/query-filters.ts
index c4ee44d948..e76df03d8f 100644
--- a/packages/core/utils/src/traverse/query-filters.ts
+++ b/packages/core/utils/src/traverse/query-filters.ts
@@ -1,8 +1,8 @@
-import { curry, isObject, isEmpty, isArray, isNil, cloneDeep, omit, prop } from 'lodash/fp';
+import { curry, isObject, isEmpty, isArray, isNil, cloneDeep, omit } from 'lodash/fp';
 
 import traverseFactory from './factory';
 
-import { VisitorOptions } from '../../traverse-entity';
+const isObj = (value: unknown): value is Record<string, unknown> => isObject(value);
 
 const filters = traverseFactory()
   .intercept(
@@ -13,7 +13,9 @@ const filters = traverseFactory()
         filters.map((filter, i) => {
           // In filters, only operators such as $and, $in, $notIn or $or and implicit operators like [...]
           // can have a value array, thus we can update the raw path but not the attribute one
-          const newPath = { ...options.path, raw: `${options.path.raw}[${i}]` };
+          const newPath = options.path
+            ? { ...options.path, raw: `${options.path.raw}[${i}]` }
+            : options.path;
 
           return recurse(visitor, { ...options, path: newPath }, filter);
         })
@@ -23,34 +25,31 @@ const filters = traverseFactory()
   )
   .intercept(
     // Ignore non object filters and return the value as-is
-    (filters) => !isObject(filters),
+    (filters): filters is unknown => !isObject(filters),
     (_, __, filters) => {
       return filters;
     }
   )
   // Parse object values
-  .parse(
-    (value) => typeof value === 'object',
-    () => ({
-      transform: cloneDeep,
+  .parse(isObj, () => ({
+    transform: cloneDeep,
 
-      remove(key, data) {
-        return omit(key, data);
-      },
+    remove(key, data) {
+      return omit(key, data);
+    },
 
-      set(key, value, data) {
-        return { ...data, [key]: value };
-      },
+    set(key, value, data) {
+      return { ...data, [key]: value };
+    },
 
-      keys(data) {
-        return Object.keys(data);
-      },
+    keys(data) {
+      return Object.keys(data);
+    },
 
-      get(key, data) {
-        return prop(key, data);
-      },
-    })
-  )
+    get(key, data) {
+      return data[key];
+    },
+  }))
   // Ignore null or undefined values
   .ignore(({ value }) => isNil(value))
   // Recursion on operators (non attributes)
diff --git a/packages/core/utils/src/traverse/query-populate.ts b/packages/core/utils/src/traverse/query-populate.ts
index f4faaab221..489b2a0e20 100644
--- a/packages/core/utils/src/traverse/query-populate.ts
+++ b/packages/core/utils/src/traverse/query-populate.ts
@@ -11,10 +11,12 @@ import {
   cloneDeep,
   join,
   first,
+  omit,
 } from 'lodash/fp';
 
 import traverseFactory from './factory';
 import { Attribute } from '../types';
+import { isMorphToRelationalAttribute } from '../content-types';
 
 const isKeyword = (keyword: string) => {
   return ({ key, attribute }: { key: string; attribute: Attribute }) => {
@@ -25,6 +27,8 @@ const isKeyword = (keyword: string) => {
 const isStringArray = (value: unknown): value is string[] =>
   isArray(value) && value.every(isString);
 
+const isObj = (value: unknown): value is Record<string, unknown> => isObject(value);
+
 const populate = traverseFactory()
   // Array of strings ['foo', 'foo.bar'] => map(recurse), then filter out empty items
   .intercept(isStringArray, async (visitor, options, populate, { recurse }) => {
@@ -57,7 +61,8 @@ const populate = traverseFactory()
       },
 
       keys(data) {
-        return [first(tokenize(data))];
+        const v = first(tokenize(data));
+        return v ? [v] : [];
       },
 
       get(key, data) {
@@ -68,7 +73,7 @@ const populate = traverseFactory()
     };
   })
   // Parse object values
-  .parse(isObject, () => ({
+  .parse(isObj, () => ({
     transform: cloneDeep,
 
     remove(key, data) {
@@ -102,7 +107,11 @@ const populate = traverseFactory()
     }
   )
   .on(isKeyword('on'), async ({ key, visitor, path, value }, { set, recurse }) => {
-    const newOn = {};
+    const newOn: Record<string, unknown> = {};
+
+    if (!isObj(value)) {
+      return;
+    }
 
     for (const [uid, subPopulate] of Object.entries(value)) {
       const model = strapi.getModel(uid);
@@ -117,16 +126,14 @@ const populate = traverseFactory()
   })
   // Handle populate on relation
   .onRelation(async ({ key, value, attribute, visitor, path, schema }, { set, recurse }) => {
-    const isMorphRelation = attribute.relation.toLowerCase().startsWith('morph');
-
-    if (isMorphRelation) {
+    if (isMorphToRelationalAttribute(attribute)) {
       // Don't traverse values that cannot be parsed
-      if (!isObject(value) || !isObject(value?.on)) {
+      if (!isObject(value) || !('on' in value && isObject(value?.on))) {
         return;
       }
 
       // If there is a populate fragment defined, traverse it
-      const newValue = await recurse(visitor, { schema, path }, { on: value.on });
+      const newValue = await recurse(visitor, { schema, path }, { on: value?.on });
 
       set(key, { on: newValue });
     }
@@ -159,12 +166,11 @@ const populate = traverseFactory()
   .onDynamicZone(async ({ key, value, attribute, schema, visitor, path }, { set, recurse }) => {
     if (isObject(value)) {
       const { components } = attribute;
-      const { on, ...properties } = value;
 
       const newValue = {};
 
       // Handle legacy DZ params
-      let newProperties = properties;
+      let newProperties: unknown = omit('on', value);
 
       for (const componentUID of components) {
         const componentSchema = strapi.getModel(componentUID);
@@ -174,8 +180,8 @@ const populate = traverseFactory()
       Object.assign(newValue, newProperties);
 
       // Handle new morph fragment syntax
-      if (on) {
-        const newOn = await recurse(visitor, { schema, path }, { on });
+      if ('on' in value && value.on) {
+        const newOn = await recurse(visitor, { schema, path }, { on: value.on });
 
         // Recompose both syntaxes
         Object.assign(newValue, newOn);
diff --git a/packages/core/utils/src/traverse/query-sort.ts b/packages/core/utils/src/traverse/query-sort.ts
index 4dba6391aa..f95a3f6832 100644
--- a/packages/core/utils/src/traverse/query-sort.ts
+++ b/packages/core/utils/src/traverse/query-sort.ts
@@ -26,6 +26,8 @@ const isObjectArray = (value: unknown): value is object[] =>
 const isNestedSorts = (value: unknown): value is string =>
   isString(value) && value.split(',').length > 1;
 
+const isObj = (value: unknown): value is Record<string, unknown> => isObject(value);
+
 const sort = traverseFactory()
   .intercept(
     // String with chained sorts (foo,bar,foobar) => split, map(recurse), then recompose
@@ -98,7 +100,8 @@ const sort = traverseFactory()
       },
 
       keys(data) {
-        return [first(tokenize(data))];
+        const v = first(tokenize(data));
+        return v ? [v] : [];
       },
 
       get(key, data) {
@@ -109,7 +112,7 @@ const sort = traverseFactory()
     };
   })
   // Parse object values
-  .parse(isObject, () => ({
+  .parse(isObj, () => ({
     transform: cloneDeep,
 
     remove(key, data) {
diff --git a/packages/core/utils/src/types.ts b/packages/core/utils/src/types.ts
index f7bdf3fb35..e093a71ff8 100644
--- a/packages/core/utils/src/types.ts
+++ b/packages/core/utils/src/types.ts
@@ -14,6 +14,14 @@ export interface Attribute {
 
 export interface RelationalAttribute extends Attribute {
   relation: string;
+  target: string;
+}
+export interface ComponentAttribute extends Attribute {
+  component: string;
+  repeatable?: boolean;
+}
+export interface DynamicZoneAttribute extends Attribute {
+  components: string[];
 }
 
 export type Kind = 'singleType' | 'collectionType';
diff --git a/packages/core/utils/src/validators.ts b/packages/core/utils/src/validators.ts
index 1b67445a42..d1e3d270a2 100644
--- a/packages/core/utils/src/validators.ts
+++ b/packages/core/utils/src/validators.ts
@@ -1,7 +1,7 @@
 /* eslint-disable no-template-curly-in-string */
 import * as yup from 'yup';
 import _ from 'lodash';
-import { defaults } from 'lodash/fp';
+import { defaults, isNumber, isInteger } from 'lodash/fp';
 import * as utils from './string-formatting';
 import { YupValidationError } from './errors';
 import printValue from './print-value';
@@ -65,46 +65,64 @@ class StrapiIDSchema extends MixedSchemaType {
     super({ type: 'strapiID' });
   }
 
-  _typeCheck(value) {
-    return typeof value === 'string' || (Number.isInteger(value) && value >= 0);
+  _typeCheck(value: unknown): value is string | number {
+    return typeof value === 'string' || (isNumber(value) && isInteger(value) && value >= 0);
   }
 }
 
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore
 yup.strapiID = () => new StrapiIDSchema();
 
-const handleYupError = (error, errorMessage) => {
+const handleYupError = (error: yup.ValidationError, errorMessage: string) => {
   throw new YupValidationError(error, errorMessage);
 };
 
 const defaultValidationParam = { strict: true, abortEarly: false };
 
 const validateYupSchema =
-  (schema, options = {}) =>
-  async (body, errorMessage) => {
+  (schema: yup.AnySchema, options = {}) =>
+  async (body: unknown, errorMessage: string) => {
     try {
       const optionsWithDefaults = defaults(defaultValidationParam, options);
       const result = await schema.validate(body, optionsWithDefaults);
       return result;
     } catch (e) {
-      handleYupError(e, errorMessage);
+      if (e instanceof yup.ValidationError) {
+        handleYupError(e, errorMessage);
+      }
+
+      throw e;
     }
   };
 
 const validateYupSchemaSync =
-  (schema, options = {}) =>
-  (body, errorMessage) => {
+  (schema: yup.AnySchema, options = {}) =>
+  (body: unknown, errorMessage: string) => {
     try {
       const optionsWithDefaults = defaults(defaultValidationParam, options);
       return schema.validateSync(body, optionsWithDefaults);
     } catch (e) {
-      handleYupError(e, errorMessage);
+      if (e instanceof yup.ValidationError) {
+        handleYupError(e, errorMessage);
+      }
+
+      throw e;
     }
   };
 
+interface NoTypeOptions {
+  path: string;
+  type: string;
+  value: unknown;
+  originalValue: unknown;
+}
+
 // Temporary fix of this issue : https://github.com/jquense/yup/issues/616
 yup.setLocale({
   mixed: {
-    notType({ path, type, value, originalValue }) {
+    notType(options: NoTypeOptions) {
+      const { path, type, value, originalValue } = options;
       const isCast = originalValue != null && originalValue !== value;
       const msg =
         `${path} must be a \`${type}\` type, ` +