ExpressJS Error handling - ExpressJS

How to handle errors in Express

It is done using middleware. The error handling middleware are Defined in the same way as other middleware functions, except that the error-handling functions MUST have four arguments instead of three: (err, req, res, next).
For example, to send a response on any error, we can use:
Till now we were handling errors in the routes itself. These error handling middleware allow us to seperate out our error logic and send responses accordingly.
A call to the functionnext(err)skips all middleware and matches us to the next error handler for that route. For example,
These error handling middleware can be strategically placed after routes or contain conditions to detect error types and respond to the clients accordingly. An example of the above is:
Error handling

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