//get query&params in express

//etc. example.com/user/000000?sex=female

app.get('/user/:id', function(req, res) {

  const query = req.query;// query = {sex:"female"}

  const params = req.params; //params = {id:"000000"}

})

//get query&params in express

//etc. example.com/user/000000?sex=female

app.get('/user/:id', function(req, res) {

  const query = req.query;// query = {sex:"female"}

  const params = req.params; //params = {id:"000000"}

})

2014年5月4日更新

此处保留旧答案：https://gist.github.com/stefek99/b10ed037d2a4a323d638

1） 安装express：npm安装express

应用程序.js

var express = require('express');
var app = express();

app.get('/endpoint', function(request, response) {
    var id = request.query.id;
    response.end("I have received the ID: " + id);
});

app.listen(3000);
console.log("node express app started at http://localhost:3000");

2） 运行app:node app.js

3） 在浏览器中访问：http://localhost:3000/endpoint?id=something

我收到了ID：某物

（自从我的回答以来，很多事情都发生了变化，我相信这是值得的，让事情保持最新）

如果您需要向IP和域发送GET请求（其他答案没有提到您可以指定端口变量），您可以使用此函数：

function getCode(host, port, path, queryString) {
    console.log("(" + host + ":" + port + path + ")" + "Running httpHelper.getCode()")

    // Construct url and query string
    const requestUrl = url.parse(url.format({
        protocol: 'http',
        hostname: host,
        pathname: path,
        port: port,
        query: queryString
    }));

    console.log("(" + host + path + ")" + "Sending GET request")
    // Send request
    console.log(url.format(requestUrl))
    http.get(url.format(requestUrl), (resp) => {
        let data = '';

        // A chunk of data has been received.
        resp.on('data', (chunk) => {
            console.log("GET chunk: " + chunk);
            data += chunk;
        });

        // The whole response has been received. Print out the result.
        resp.on('end', () => {
            console.log("GET end of response: " + data);
        });

    }).on("error", (err) => {
        console.log("GET Error: " + err);
    });
}

不要错过文件顶部的所需模块：

http = require("http");
url = require('url')

还要记住，您可以使用https模块通过安全域和ssl进行通信。因此这两条线将改变：

https = require("https");
...
https.get(url.format(requestUrl), (resp) => { ......

这里有很多关于使用request.query访问查询的答案，但是没有人提到它的类型怪癖。查询字符串类型可以是字符串或数组，此类型由用户控制。

例如，使用以下代码：

const express = require("express");
const app = express();

app.get("/", function (req, res) {
  res.send(`Your name is ${(req.query.name || "").length} characters long`);
});

app.listen(3000);

请求/？name=bob将返回您的姓名长3个字符，但请求/？name＝bob&name＝jane将返回您的名字有2个字符长，因为参数现在是一个数组['bob'，'jane']。

Express提供了两个查询解析器：简单的和扩展的，它们都将为您提供字符串或数组。我个人认为，应该重写解析器，使其具有一致的类型：所有数组或所有字符串，而不是检查方法的可能副作用或验证类型。

const express = require("express");
const app = express();

const querystring = require("querystring");

// if asArray=false only the first item with the same name will be returned
// if asArray=true all items will be returned as an array (even if they are a single item)
const asArray = false;
app.set("query parser", (qs) => {
  const parsed = querystring.parse(qs);
  return Object.entries(parsed).reduce((previous, [key, value]) => {
    const isArray = Array.isArray(value);
    if (!asArray && isArray) {
      value = value[0];
    } else if (asArray && !isArray) {
      value = [value];
    }

    previous[key] = value;
    return previous;
  }, {});
});

app.get("/", function (req, res) {
  res.send(`Your name is ${(req.query.name || "").length} characters long`);
});

app.listen(3000);

如果您想避免表达，请使用以下示例：

var http = require('http');
const url = require('url');

function func111(req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  var q = url.parse(req.url, true);
  res.end("9999999>>> " + q.query['user_name']); 
}

http.createServer(func111).listen(3000); 

用法：

curl http://localhost:3000?user_name=user1

通过yl