无法使用 ExpressJS 捕获 URL 参数

Question

我正在尝试从来自 Fitbit API 的回调 URL 中捕获参数值。

回调 URL 如下所示，

http://localhost:9000/callback#access_token=********&user_id=******&scope=睡眠+设置+营养+activity+社交+心率+个人资料+重量+位置&token_type=承载&expires_in=30418415

我在 fitbit API 中通过回调 URL 声明为 http://localhost:9000/callback。

我的 ExpressJS 代码如下。

const express = require('express');
const morgan = require('morgan');
const path = require('path');

const app = express();


app.use(morgan(':remote-addr - :remote-user [:date[clf]] ":method :url HTTP/:http-version" :status :res[content-length] :response-time ms'));


app.use(express.static(path.resolve(__dirname, '..', 'build')));


app.get('*', (req, res) => {
    res.sendFile(path.resolve(__dirname, '..', 'build', 'index.html'));
});

const PORT = process.env.PORT || 9000;

app.get('/callback', function(req, res) {
    var access_token = req.param('access_token') || null;
    var user_id = req.param('user_id') || null;

    res.send(access_token + ' ' + user_id);
});

app.listen(PORT, () => {
    console.log(`App listening on port ${PORT}!`);
});

我想不通问题出在哪里。

Answer 1

URL中的#符号是引入framgent标识符。所以你的回调 url http://localhost:3000/callback#access_token=********&user_id=*******&scope=sleep+settings+nutrition+activity+social+heartrate+profile+weight+location&token_type=Bearer&expires_in=30418415 只会得到 http://localhost:3000/callback 而不会向你的服务器发送任何参数。所以，你不能直接在你的服务器中获取这些参数。

但是有解决办法。请参考这个answer.

Answer 2

req.param('token') is depreciated use req.params.token pass the value directly into the url

如果您使用 req.params，请在 url

中指定关键参数

   app.get('/callback/:access_token/:user_id', function(req, res) {
   //url ==> localhost:9000/callback/1233/123
    var access_token = req.params.access_token || null;
        var user_id = req.params.user_id || null;
           console.log(req.params)
        res.send(access_token + ' ' + user_id);
    });

if you want the catch the value in the url means use req.query instead of req.params pass the value using the key of req.query

app.get('/callback',function(req, res) {
    var access_token = req.query.access_token || null;
    var user_id = req.query.user_id || null;
    console.log(req.query);
    res.send(access_token + ' ' + user_id);
});

无法使用 ExpressJS 捕获 URL 参数

Can't catch the URL parameters with ExpressJS

node.js

express

fitbit