我的express.router（）。get方法有什么问题？

Question

I'm trying to follow this tutorial , in which the author provides a sample code:

// server.js

// BASE SETUP
// =============================================================================

// call the packages we need
var express    = require('express');        // call express
var app        = express();                 // define our app using express
var bodyParser = require('body-parser');

// configure app to use bodyParser()
// this will let us get the data from a POST
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

var port = process.env.PORT || 8080;        // set our port

// ROUTES FOR OUR API
// =============================================================================
var router = express.Router();              // get an instance of the express Router

// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
router.get('/', function(req, res) {
    res.json({ message: 'hooray! welcome to our api!' });   
});

// more routes for our API will happen here

// REGISTER OUR ROUTES -------------------------------
// all of our routes will be prefixed with /api
app.use('/api', router);

// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);

And I tweaked it a little bit and here is my code:

'use strict';
var express = require('express');
var app = express();
var bodyParser = require('body-parser');

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

var port = process.env.PORT || 8081;

var router = express.Router();

router.get('/', function(req, res, next) {
  res.json({ message: 'Hello World!' });
});

app.use('/api', router);


app.listen(port);
console.log('Magic happens on port ' + port);

The server runs perfectly but when I visit localhost:8081 , I get the following message on my browser: Cannot GET /

What am I doing wrong here?

Answer 1

Since you added app.use('/api', router);

And your route is router.get('/', function(req, res, next) { res.json({ message: 'Hello World!' }); });

Then to access '/' you need to request with /api/

Update : If you have set the port on in env use that port or else you should be able to access using localhost:8081/api/

Hope it helps !

Answer 2

The above comment is correct.

You have added prefix '/api' to your local server and all incoming request will be http://localhost:<port>/api/<path>

app.use('/api', router);

If you want to access like this (without prefix) http://localhost:<port>/<path> Please update your code to

app.use(router);