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Adding 404 page in express
Now we have a App.js and route.js for handling routes. For any other http requests for which we have not added any request handling will results into an error page. Example for url ‘test’ −
App.js
const http = require('http');
const express = require('express');
const bodyParser = require('body-parser');
const route = require('./routes');
const app = express();
app.use(bodyParser.urlencoded({extended: false}));
app.use(route);
const server = http.createServer(app);
server.listen(3000);Showing meaningful error message on incorrect url’s−
We can add a all catch middleware for incorrect url at the end of all middleware’s in App.js −
const http = require('http');
const express = require('express');
const bodyParser = require('body-parser');
const route = require('./routes');
const app = express();
app.use(bodyParser.urlencoded({extended: false}));
app.use(route);
app.use((req, res,next)= >{
res.send('<h1> Page not found </h1>');
});
const server = http.createServer(app);
server.listen(3000);The last middleware is a request handler if no request handler is found and returns a response. From this all catch middleware we can send message for incorrect paths.
Now for any incorrect path we see below output on browser −
We can use separate router from express and add it in the last by order respective other routers.
Sending 404 status code −
app.use((req, res,next)=>{
res.status(404).send('<h1> Page not found </h1>');
});We can chain other functions like setHeader in the response before sending actual message.
res.setHeader(‘’).send(‘’);
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