nodeJs--mime module

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1. What is the mime module

mime is an Internet standard that lets you set how files are opened in browsers.
It is a third-party module and needs to be downloaded manually.

Second, how to install the mime module

Use npm to install the module
npm -i mime //To download to the global, add -g


installationAfter completion, the node_modules and json files will appear in the project, indicating that the installation is successful; then you can use require to import it

Three, mime module method

1.mime.getType(url)

The resource type can be returned through the path
You can add a content-type to the resource (html, css, etc.) requested by the website
No content-type is added to use advanced browsers without error, but low-level browsers mayerror

var http = require('http')var url = require('url')var mime = require('mime')var fs = require('fs')http.createServer((req, res) => {let pathname = url.parse(req.url).pathnamelet type = mime.getType(req.url)console.log(type)fs.readFile(__dirname + pathname, (err, data) => {if (!err) {res.setHeader("content-Type", type)res.end(data)}})}).listen(8081)

When I visit the test.txt document

2.mime.getExtension(type)

The query file name can be used with getType, and the MIME type is passed in

var mime = require('mime')var type=mime.getType("./img/test.txt")let type2=mime.getExtension(type)console.log(type,type2)

3.mime.define

mime custom type, when the mime-db library that comes with the mime module does not exist or cannot meet the MIME type we need, you can also customize the MIME type

var mime = require('mime')mime.define({'text/mytext': ['t-txt', 't-ext', 't-xt'],});type=mime.getExtension('text/mytext')console.log(type)