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finalhandler

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finalhandler

Node.js final http responder


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Weekly downloads
38M
increased by5.29%
Maintainers
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What is finalhandler?

The finalhandler npm package is a Node.js module designed to ensure that the final response is sent to the client. It acts as a final step in the request-response cycle, handling any remaining tasks such as sending a 404 response if no middleware has handled the request, or handling errors that may have occurred during the request processing.

What are finalhandler's main functionalities?

Error Handling

This code demonstrates how finalhandler can be used to handle errors that occur during the request processing. If an error is thrown, finalhandler will ensure that an appropriate HTTP error response is sent to the client.

const finalhandler = require('finalhandler');
const http = require('http');

http.createServer(function (req, res) {
  const done = finalhandler(req, res);
  throw new Error('Something went wrong!');
}).listen(3000);

Uncaught Exception Handling

This code sample shows how finalhandler can handle exceptions that are not caught within the context of the request. It ensures that the server remains operational and sends an error response to the client.

const finalhandler = require('finalhandler');
const http = require('http');

http.createServer(function (req, res) {
  const done = finalhandler(req, res);
  process.nextTick(function () {
    throw new Error('Async error!');
  });
  done();
}).listen(3000);

404 Not Found Response

This example illustrates how finalhandler can be used to send a 404 Not Found response when no middleware or routes have handled the request.

const finalhandler = require('finalhandler');
const http = require('http');

http.createServer(function (req, res) {
  const done = finalhandler(req, res);
  // No routes or middleware respond
  done();
}).listen(3000);

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Package last updated on 23 Mar 2022

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