In this guide we will see how you can catch errors and send them to the Application Monitoring / Error Tracking Software you want.
::: tip
In this example we will use [Sentry](https://sentry.io).
:::
## Create a middleware
A [middleware](../concepts/middlewares.md) will be used in order to catch the errors which will then be sent to Sentry.
- Create a `./middlewares/sentry/index.js` file.
**Path —** `./middlewares/sentry/index.js`
```js
module.exports = strapi => {
return {
initialize() {
strapi.app.use(async (ctx, next) => {
await next();
});
},
};
};
```
## Handle errors
Here is the [Node.js client documentation](https://docs.sentry.io/platforms/node/).
Install it with `yarn add @sentry/node` or `npm install @sentry/node --save`.
- Now add the logic that will catch errors.
**Path —** `./middlewares/sentry/index.js`
```js
const Sentry = require('@sentry/node');
Sentry.init({
dsn: 'https://<key>@sentry.io/<project>',
environment: strapi.config.environment,
});
module.exports = strapi => {
return {
initialize() {
strapi.app.use(async (ctx, next) => {
try {
await next();
} catch (error) {
Sentry.captureException(error);
throw error;
}
});
},
};
};
```
::: warning
It's important to call `throw(error);` to avoid stopping the middleware stack. If you don't re-throw the error, it won't be handled by the Strapi's error formatter and the api will never respond to the client.
