Detailed explanation of routing rules in express and how to obtain request parameters

This article mainly shares with you a method based on routing rules and obtaining request parameters in express. It has a good reference value and I hope it can help everyone.

Common routing rules in express

The main routing rules used are get and post, namely

var express = require('express');
var app = express();
app.get();  // get和post两种请求方式
app.post();

The first parameter of app.get() and app.post() is the request path, and the second parameter is the callback function that handles the request; the callback function has two parameters, Req and res, respectively, represent request information and response information.

Get the request path and various parameters in the request body

The path request and the corresponding form of getting the request path are as follows:

(1) req.query (query the parameters in the get request)

GET ／shoes?order=desc&shoe[type]=converse&shoe[color]=blue
req.query.order
// =>'desc'
req,query.shoe.type
// =>'converse'

(2) req.body (query request body)

##

// POST user[name]=dby&user[email]=bing@163.com
req.body.user.name
// =>'dby'

(3) req.params

// GET /file/javascript/jquery.js
req.params[0]
// => 'javascript/jquery.js'

(4) req.params(name)

// ?name=tobi
req.params(name)
// => 'tobi'
// POST name=tobi
req.param('name')
// => 'tobi'

From the above code, we can clearly see the meaning of various acquisition paths:

req.query: Process the get request and obtain the request parameters of the get request

req.params: Process /: For get or post requests in the form of xxx, get the request parameters

req.body: Process the post request, get the request body of the posted request

req.param(): Process the get and post requests, But the search priority from high to low is req.params->req.body->req.query

Note: Path rules support regular expressions.

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