PayloadTooLargeError: request entity too large

To handle the "PayloadTooLargeError: request entity too large" error in an Express application, you can follow these steps:

  1. Install the express and body-parser packages if you haven't already done so. You can install them using npm (Node Package Manager) by running the following command in your terminal:
npm install express body-parser
  1. Require the necessary modules in your Express application file. Typically, this file is named app.js or index.js. Add the following lines of code at the top of your file:
const express = require('express');
const bodyParser = require('body-parser');
  1. Configure the body-parser middleware to handle the request payload. Body-parser is used to parse the incoming request body and make it available in the req.body property. Add the following line of code after creating the Express app instance:
app.use(bodyParser.urlencoded({ extended: true }));
  1. Increase the limit option of body-parser to allow larger request payloads. By default, body-parser limits the request payload size to 100kb. You can increase this limit by adding the following line of code after the app.use() line:
app.use(bodyParser.json({ limit: '10mb' }));

In this example, the limit is set to 10mb (megabytes), but you can adjust it according to your needs.

  1. Handle the error in your Express error-handling middleware. When the request payload exceeds the specified limit, Express will throw the PayloadTooLargeError. To handle this error and send an appropriate response to the client, add the following code after all your other routes and middleware:
app.use(function (err, req, res, next) {
  if (err instanceof bodyParser.JsonPayloadTooLargeError) {
    res.status(413).send('Request entity too large');
  } else {
    next(err);
  }
});

That's it! With these steps, you have configured your Express application to handle the "PayloadTooLargeError: request entity too large" error and provide a suitable response to the client when the request payload exceeds the specified limit.