I'm trying to figure out why the routing doesn't work if I use expressjs, I have this code:
const express = require('express');
const app = express();
const router = express.Router();
app.get('/foo', function (req, res) {
res.send('Hello World.')
});
the code above works well, but if I replace the route with this:
router.get('/foo', function(req, res, next) {
res.send('This is api.')
});
I get:
Cannot GET /foo when using express.Router()
You are missing the following:
app.use(router);
Towards the bottom of your code. You'll also need
app.listen(3000);
Or whatever port you want to run your application on.
Full example:
const express = require('express');
const app = express();
const router = express.Router();
router.get('/foo', function (req, res, next) {
res.send('This is api.')
});
app.use(router);
app.listen(3000);
You need to configure each router properly in order to use it in Express.
In your root server file (index.js/app.js) you need to register the router with the app. For example:
const express = require("express");
const app = express();
const fooRouter = require("./routes/foo");
app.use("/foo", fooRouter);
Then in routes/foo.js you can use your code as before ("but note that route paths will be relative to "/foo" a this point), but you also need to export the router. For example:
const express = require("express");
const router = express.Router();
router.get("/bar", (req, res) => {
// ...
});
module.exports = router;
Where the final route will be "/foo/bar". For just "/foo", you can define a handler for "/" within foo.js.
You might have mistakenly used app.get(router) instead of app.use(router).
