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https://github.com/pillarjs/finalhandler
Node.js final http responder
https://github.com/pillarjs/finalhandler
404 500 javascript nodejs
Last synced: 5 days ago
JSON representation
Node.js final http responder
- Host: GitHub
- URL: https://github.com/pillarjs/finalhandler
- Owner: pillarjs
- License: mit
- Created: 2014-06-06T01:27:19.000Z (over 10 years ago)
- Default Branch: master
- Last Pushed: 2024-10-22T19:23:57.000Z (3 months ago)
- Last Synced: 2024-10-29T13:08:21.061Z (3 months ago)
- Topics: 404, 500, javascript, nodejs
- Language: JavaScript
- Size: 181 KB
- Stars: 217
- Watchers: 19
- Forks: 54
- Open Issues: 11
-
Metadata Files:
- Readme: README.md
- Changelog: HISTORY.md
- License: LICENSE
- Security: SECURITY.md
Awesome Lists containing this project
- awesome-npm - finalhandler - Node.js final http responder (1. 后端开发 / 1.1 HTTP)
README
# finalhandler
[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Node.js Version][node-image]][node-url]
[![Build Status][github-actions-ci-image]][github-actions-ci-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
```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` or `res` will be terminated if a response has already
started.
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
[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
[github-actions-ci-image]: https://github.com/pillarjs/finalhandler/actions/workflows/ci.yml/badge.svg
[github-actions-ci-url]: https://github.com/pillarjs/finalhandler/actions/workflows/ci.yml