strapi/docs/v3.x/getting-started/next-js.md

Getting Started with Next.js

This integration guide is following the Getting started guide. We assume that you have completed Step 8 and therefore can consume the API by browsing this url.

If you haven't gone through the getting started guide, the way you request a Strapi API with Next.js remains the same except that you will not fetch the same content.

Create a Next.js app

Create a basic Next.js application.

:::: tabs

::: tab yarn

yarn create next-app nextjs-app

:::

::: tab npx

npx create-next-app nextjs-app

:::

::::

Use an HTTP client

Many HTTP clients are available but in this documentation we'll use Axios and Fetch

:::: tabs

::: tab axios

yarn add axios

:::

::: tab fetch

No installation needed

:::

::::

GET Request your collection type

Execute a GET request on the restaurant Collection Type in order to fetch all your restaurants.

Be sure that you activated the find permission for the restaurant Collection Type.

:::: tabs

::: tab axios

Request

import axios from 'axios'

axios.get('http://localhost:1337/restaurants')
  .then(response => {
    console.log(response);
  })

:::

::: tab fetch

Request

fetch("http://localhost:1337/restaurants", {
  method: "GET",
  headers: {
     'Content-Type': 'application/json'
  },
}).then(response => response.json())
  .then(data => console.log(data));

:::

Response

[{
  "id": 1,
  "name": "Biscotte Restaurant",
  "description": "Welcome to Biscotte restaurant! Restaurant Biscotte offers a cuisine based on fresh, quality products, often local, organic when possible, and always produced by passionate producers.",
  "created_by": {
    "id": 1,
    "firstname": "Paul",
    "lastname": "Bocuse",
    "username": null
  },
  "updated_by": {
    "id": 1,
    "firstname": "Paul",
    "lastname": "Bocuse",
    "username": null
  },
  "created_at": "2020-07-31T11:37:16.964Z",
  "updated_at": "2020-07-31T11:37:16.975Z",
  "categories": [{
    "id": 2,
    "name": "French Food",
    "created_by": 1,
    "updated_by": 1,
    "created_at": "2020-07-31T11:36:23.164Z",
    "updated_at": "2020-07-31T11:36:23.172Z"
  }]
}]

::::

Example

:::: tabs

::: tab axios

./pages/index.js

import axios from 'axios'

const Home = ({ restaurants, error }) => {
  if (error) {
    return <div>An error occured: {error.message}</div>
  }
  return (
    <ul>
      {restaurants.map(restaurant => <li key={restaurant.id}>{restaurant.name}</li>)}
    </ul>
  )
}

Home.getInitialProps = async (ctx) => {
  try {
    const res = await axios.get('http://localhost:1337/restaurants')
    const restaurants = res.data
    return { restaurants }
  } catch (error) {
    return { error }
  }
}

export default Home;

:::

::: tab fetch

./pages/index.js

const Home = ({ restaurants, error }) => {
  if (error) {
    return <div>An error occured: {error.message}</div>;
  }
  return (
    <ul>
      {restaurants.map((restaurant) => (
        <li key={restaurant.id}>{restaurant.name}</li>
      ))}
    </ul>
  );
};
Home.getInitialProps = async (ctx) => {
  try {
    // Parses the JSON returned by a network request
    const parseJSON = (resp) => (resp.json ? resp.json() : resp);
    // Checks if a network request came back fine, and throws an error if not
    const checkStatus = (resp) => {
      if (resp.status >= 200 && resp.status < 300) {
        return resp;
      }

      return parseJSON(resp).then((resp) => {
        throw resp;
      });
    };

    const headers = {
      'Content-Type': 'application/json',
    };

    const restaurants = await fetch('http://localhost:1337/restaurants', {
      method: 'GET',
      headers,
    })
      .then(checkStatus)
      .then(parseJSON);

    return { restaurants };
  } catch (error) {
    return { error };
  }
};

export default Home;

:::

::::

POST Request your collection type

Execute a POST request on the restaurant Collection Type in order to create a restaurant.

Be sure that you activated the create permission for the restaurant Collection Type and the find permission for the category Collection type.

:::: tabs

::: tab axios

Request

import axios from 'axios'

axios.post('http://localhost:1337/restaurants', {
    name: 'Dolemon Sushi',
    description: 'Unmissable Japanese Sushi restaurant. The cheese and salmon makis are delicious',
    categories: [
      3
    ]
  })
  .then(response => {
    console.log(response);
  })

:::

::: tab fetch

Request

fetch('http://localhost:1337/restaurants', {
   method: 'POST',
   headers: {
      'Content-Type': 'application/json'
   },
   body: JSON.stringify({
     name: 'Dolemon Sushi',
     description: 'Unmissable Japanese Sushi restaurant. The cheese and salmon makis are delicious',
     categories: [
       3
     ]
   })
 }).then(response => response.json())
   .then(data => console.log(data));

:::

Response

{
    "id": 2,
    "name": "Dolemon Sushi",
    "description": "Unmissable Japanese Sushi restaurant. The cheese and salmon makis are delicious",
    "created_by": null,
    "updated_by": null,
    "created_at": "2020-08-04T09:57:11.669Z",
    "updated_at": "2020-08-04T09:57:11.669Z",
    "categories": [{
      "id": 3,
      "name": "Japanese",
      "created_by": 1,
      "updated_by": 1,
      "created_at": "2020-07-31T11:36:23.164Z",
      "updated_at": "2020-07-31T11:36:23.172Z"
    }]
}

::::

Example

:::: tabs

::: tab axios

./pages/index.js

import { useState } from 'react';
import axios from 'axios';

const Home = ({ allCategories, errorCategories }) => {
  const [modifiedData, setModifiedData] = useState({
    name: '',
    description: '',
    categories: [],
  });
  const [errorRestaurants, setErrorRestaurants] = useState(null)

  const handleChange = ({ target: { name, value } }) => {
    setModifiedData((prev) => ({
      ...prev,
      [name]: value,
    }));
  };

  const handleSubmit = async (e) => {
    e.preventDefault();

    try {
      const response = await axios.post('http://localhost:1337/restaurants', modifiedData);
      console.log(response);
    } catch (error) {
      setErrorRestaurants(error)
    }
  };

  const renderCheckbox = (category) => {
    const { categories } = modifiedData;
    const isChecked = categories.includes(category.id);
    const handleCheckboxChange = () => {
      if (!categories.includes(category.id)) {
        handleChange({ target: { name: 'categories', value: categories.concat(category.id) } });
      } else {
        handleChange({
          target: { name: 'categories', value: categories.filter((v) => v !== category.id) },
        });
      }
    };
    return (
      <div key={category.id}>
        <label htmlFor={category.id}>{category.name}</label>
        <input
          type="checkbox"
          checked={isChecked}
          onChange={handleCheckboxChange}
          name="categories"
          id={category.id}
        />
      </div>
    );
  };
  if (errorCategories) {
    return <div>An error occured (categories): {errorCategories.message}</div>;
  }
  if (errorRestaurants) {
    return <div>An error occured (restaurants): {errorRestaurants.message}</div>;
  }
  return (
    <div>
      <form onSubmit={handleSubmit}>
        <h3>Restaurants</h3>
        <br />
        <label>
          Name:
          <input type="text" name="name" value={modifiedData.name} onChange={handleChange} />
        </label>
        <label>
          Description:
          <input
            type="text"
            name="description"
            value={modifiedData.description}
            onChange={handleChange}
          />
        </label>
        <div>
          <br />
          <b>Select categories</b>
          <br />
          {allCategories.map(renderCheckbox)}
        </div>
        <br />
        <button type="submit">Submit</button>
      </form>
    </div>
  );
};

Home.getInitialProps = async (ctx) => {
  try {
    const res = await axios.get('http://localhost:1337/categories');
    const allCategories = res.data
    return { allCategories };
  } catch (errorCategories) {
    return { errorCategories };
  }
};

export default Home;

:::

::: tab fetch

./pages/index.js

import { useState } from 'react';

// Parses the JSON returned by a network request
const parseJSON = (resp) => (resp.json ? resp.json() : resp);
// Checks if a network request came back fine, and throws an error if not
const checkStatus = (resp) => {
  if (resp.status >= 200 && resp.status < 300) {
    return resp;
  }
  return parseJSON(resp).then((resp) => {
    throw resp;
  });
};
const headers = {
  'Content-Type': 'application/json',
};

const Home = ({ allCategories, errorCategories }) => {
  const [modifiedData, setModifiedData] = useState({
    name: '',
    description: '',
    categories: [],
  });
  const [errorRestaurants, setErrorRestaurants] = useState(null)

  const handleChange = ({ target: { name, value } }) => {
    setModifiedData((prev) => ({
      ...prev,
      [name]: value,
    }));
  };

  const handleSubmit = async (e) => {
    e.preventDefault();

    try {
      const response = await fetch('http://localhost:1337/restaurants', {
        method: 'POST',
        headers,
        body: JSON.stringify(modifiedData),
      })
        .then(checkStatus)
        .then(parseJSON);
    } catch (error) {
      setErrorRestaurants(error)
    }
  };

  const renderCheckbox = (category) => {
    const { categories } = modifiedData;
    const isChecked = categories.includes(category.id);
    const handleCheckboxChange = () => {
      if (!categories.includes(category.id)) {
        handleChange({ target: { name: 'categories', value: categories.concat(category.id) } });
      } else {
        handleChange({
          target: { name: 'categories', value: categories.filter((v) => v !== category.id) },
        });
      }
    };
    return (
      <div key={category.id}>
        <label htmlFor={category.id}>{category.name}</label>
        <input
          type="checkbox"
          checked={isChecked}
          onChange={handleCheckboxChange}
          name="categories"
          id={category.id}
        />
      </div>
    );
  };

  if (errorCategories) {
    return <div>An error occured (categories): {errorCategories.message}</div>;
  }
  if (errorRestaurants) {
    return <div>An error occured (restaurants): {errorRestaurants.message}</div>;
  }

  return (
    <div>
      <form onSubmit={handleSubmit}>
        <h3>Restaurants</h3>
        <br />
        <label>
          Name:
          <input type="text" name="name" value={modifiedData.name} onChange={handleChange} />
        </label>
        <label>
          Description:
          <input
            type="text"
            name="description"
            value={modifiedData.description}
            onChange={handleChange}
          />
        </label>
        <div>
          <br />
          <b>Select categories</b>
          <br />
          {allCategories.map(renderCheckbox)}
        </div>
        <br />
        <button type="submit">Submit</button>
      </form>
    </div>
  );
};

Home.getInitialProps = async (ctx) => {
  try {
    const allCategories = await fetch('http://localhost:1337/categories', { method: 'GET', headers })
      .then(checkStatus)
      .then(parseJSON);
    return { allCategories };
  } catch (errorCategories) {
    return { errorCategories };
  }
};
export default Home;

:::

::::

PUT Request your collection type

Execute a PUT request on the restaurant Collection Type in order to update the category of a restaurant.

Be sure that you activated the put permission for the restaurant Collection Type.

:::: tabs

We consider that the id of your restaurant is 2 and the id of your category is 3

::: tab axios

Request

import axios from 'axios'

axios.put('http://localhost:1337/restaurants/2', {
  categories: [
    3
  ]
})
.then(response => {
  console.log(response);
})

:::

::: tab fetch

Request

fetch('http://localhost:1337/restaurants/2', {
  method: "PUT",
  headers: {
     'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    categories: [
      3
    ]
  })
})
.then(response => response.json())
.then(data => {
  console.log(data);
})

:::

Response

{
  "id": 2,
  "name": "Dolemon Sushi",
  "description": "Unmissable Japanese Sushi restaurant. The cheese and salmon makis are delicious",
  "created_by": null,
  "updated_by": null,
  "created_at": "2020-08-04T10:21:30.219Z",
  "updated_at": "2020-08-04T10:21:30.219Z",
  "categories": [{
    "id": 3,
    "name": "Japanese",
    "created_by": 1,
    "updated_by": 1,
    "created_at": "2020-08-04T10:24:26.901Z",
    "updated_at": "2020-08-04T10:24:26.911Z"
  }]
}

::::

Conclusion

Here is how to request your Collection Types in Strapi using Next.js. When you create a Collection Type or a Single Type you will have a certain number of REST API endpoints available to interact with.

We just used the GET, POST and PUT methods here but you can get one entry, get how much entry you have and delete an entry too. Learn more about API Endpoints