Res.Render is not a function error in node.js

Question

I am getting an "res.render is not a function error" in the Windows 10 Command Prompt when I try to run my node.js code.

What is causing this error and how can I get rid of it?

Here is my .js file:

 /*eslint-env node*/ //------------------------------------------------------------------------------ // node.js starter application for Bluemix //------------------------------------------------------------------------------ // HTTP request - duas alternativas var http = require('http'); var request = require('request'); // cfenv provides access to your Cloud Foundry environment // for more info, see: https://www.npmjs.com/package/cfenv var cfenv = require('cfenv'); //chama o express, que abre o servidor var express = require('express'); // create a new express server var app = express(); // serve the files out of ./public as our main files app.use(express.static(__dirname + '/public')); // get the app environment from Cloud Foundry var appEnv = cfenv.getAppEnv(); // start server on the specified port and binding host app.listen(appEnv.port, '0.0.0.0', function() { // print a message when the server starts listening console.log("server starting on " + appEnv.url); }); app.get('/home1', function(res){ http.get('http://developers.agenciaideias.com.br/cotacoes/json', function(res){ var body = ''; res.on('data', function(chunk){ body += chunk; }); res.on('end', function(){ var json = JSON.parse(body); var cotacao = json["bovespa"]["cotacao"]; var CotacaoDolar= json["dolar"]["cotacao"]; var VariacaoDolar=json["dolar"]["variacao"]; var CotacaoEuro=json["euro"]["cotacao"]; var VariacaoEuro=json["euro"]["variacao"]; var Atualizacao=json["atualizacao"]; res.render('cotacao.jade',{title:'Hey', message:'Sua cotação foi de'}); }); }); }); 

Error:

Answer 1

You're dealing with two sets of HTTP requests/responses.

One you are receiving:

 app.get('/home1', function(res){ 

and one you are making:

 http.get('http://developers.agenciaideias.com.br/cotacoes/json', function(res){ 

… but you've given them both the same variable name ( res ) so one masks the other and prevents you from accessing it.

Change the name of one of them.

Answer 2

I don't see where jade is hooked into your Express app. In order for res.render() to know about jade templates, you have to hook a jade handler into Express.

If jade is installed properly, you should be able to do this to hook it into Express:

app.set('view engine', 'jade');

Express doc for this .

---

In addition, you have named two arguments in the same scope as res . Change the name of the second one that is part of the http.get() so you can still access the higher scoped one that is the actual Express response object.

app.get('/home1', function (res) {
    http.get('http://developers.agenciaideias.com.br/cotacoes/json', function (res2) {
        var body = '';
        res2.on('data', function (chunk) {
            body += chunk;
        });
        res2.on('end', function () {
            var json = JSON.parse(body);
            var cotacao = json["bovespa"]["cotacao"];
            var CotacaoDolar = json["dolar"]["cotacao"];
            var VariacaoDolar = json["dolar"]["variacao"];
            var CotacaoEuro = json["euro"]["cotacao"];
            var VariacaoEuro = json["euro"]["variacao"];
            var Atualizacao = json["atualizacao"];
            res.render('cotacao.jade', {
                title: 'Hey',
                message: 'Sua cotação foi de'
            });
        });
    });
});