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# finalhandler [![NPM Version][npm-image]][npm-url] [![NPM Downloads][downloads-image]][downloads-url] [![Node.js Version][node-image]][node-url] [![Build Status][travis-image]][travis-url] [![Test Coverage][coveralls-image]][coveralls-url] Node.js function to invoke as the final step to respond to HTTP request. ## Installation This is a [Node.js](https://nodejs.org/en/) module available through the [npm registry](https://www.npmjs.com/). Installation is done using the [`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally): ```sh $ npm install finalhandler ``` ## API <!-- eslint-disable no-unused-vars --> ```js var finalhandler = require('finalhandler') ``` ### finalhandler(req, res, [options]) Returns function to be invoked as the final step for the given `req` and `res`. This function is to be invoked as `fn(err)`. If `err` is falsy, the handler will write out a 404 response to the `res`. If it is truthy, an error response will be written out to the `res`. When an error is written, the following information is added to the response: * The `res.statusCode` is set from `err.status` (or `err.statusCode`). If this value is outside the 4xx or 5xx range, it will be set to 500. * The `res.statusMessage` is set according to the status code. * The body will be the HTML of the status code message if `env` is `'production'`, otherwise will be `err.stack`. * Any headers specified in an `err.headers` object. The final handler will also unpipe anything from `req` when it is invoked. #### options.env By default, the environment is determined by `NODE_ENV` variable, but it can be overridden by this option. #### options.onerror Provide a function to be called with the `err` when it exists. Can be used for writing errors to a central location without excessive function generation. Called as `onerror(err, req, res)`. ## Examples ### always 404 ```js var finalhandler = require('finalhandler') var http = require('http') var server = http.createServer(function (req, res) { var done = finalhandler(req, res) done() }) server.listen(3000) ``` ### perform simple action ```js var finalhandler = require('finalhandler') var fs = require('fs') var http = require('http') var server = http.createServer(function (req, res) { var done = finalhandler(req, res) fs.readFile('index.html', function (err, buf) { if (err) return done(err) res.setHeader('Content-Type', 'text/html') res.end(buf) }) }) server.listen(3000) ``` ### use with middleware-style functions ```js var finalhandler = require('finalhandler') var http = require('http') var serveStatic = require('serve-static') var serve = serveStatic('public') var server = http.createServer(function (req, res) { var done = finalhandler(req, res) serve(req, res, done) }) server.listen(3000) ``` ### keep log of all errors ```js var finalhandler = require('finalhandler') var fs = require('fs') var http = require('http') var server = http.createServer(function (req, res) { var done = finalhandler(req, res, { onerror: logerror }) fs.readFile('index.html', function (err, buf) { if (err) return done(err) res.setHeader('Content-Type', 'text/html') res.end(buf) }) }) server.listen(3000) function logerror (err) { console.error(err.stack || err.toString()) } ``` ## License [MIT](LICENSE) [npm-image]: https://img.shields.io/npm/v/finalhandler.svg [npm-url]: https://npmjs.org/package/finalhandler [node-image]: https://img.shields.io/node/v/finalhandler.svg [node-url]: https://nodejs.org/en/download [travis-image]: https://img.shields.io/travis/pillarjs/finalhandler.svg [travis-url]: https://travis-ci.org/pillarjs/finalhandler [coveralls-image]: https://img.shields.io/coveralls/pillarjs/finalhandler.svg [coveralls-url]: https://coveralls.io/r/pillarjs/finalhandler?branch=master [downloads-image]: https://img.shields.io/npm/dm/finalhandler.svg [downloads-url]: https://npmjs.org/package/finalhandler