HTTP请求JSON：意外的.parse错误-如何消除它？

Question

I am using IBM Bluemix to make a web service for a school project.

My project needs to request a JSON from an API, so I can use the data it provides.

I am having trouble with the http request to the API service. I get the following alert in the Windows 10 Command Prompt.

"Syntaxerror: Unexpected Token"

I know there is something wrong with my JSON request, but is it exactly?

Here is my .js file and a print of the error screen I get when running it.

 /*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 json = JSON.parse(res); var cotacao = json["bovespa"]["cotacao"]; console.log("A sua cotação é "+cotacao); }); }); 

Print of the Error Screen in the Command Line

Answer 1

You need to use the json object you created in .on('end'

trying to JSON.parse res when res is clearly not a string is causing your error (res.toString() results in [Object object] ... hence the error as that is not valid JSON

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"];

            console.log("A sua cotação é "+cotacao);
        });
    });
});

Answer 2

Try configuring app for parsing json body:

app.configure(function () {
  app.use(express.json())
})

You will recieve a parsed json object