如何从Node.js / Express中的URL获取JSON对象

Question

I should preface my post by saying that I am a beginner and this is my first time using Node.js and Express in a real project.

I have a simple Node.js/Express project and I want to read a JSON object from a URL. Afterwards, I intend to build another url that displays html from an external website using iframe.

I read about the 'request' module online and know that I need to do something along these lines:

var express = require('express');
var router = express.Router();
var request = require('request');

// Urls for App Center REST functions
var url = 'https://someserver.com/appserver/portal/api/1.0/results/recent';

/* GET list of recent reports */
router.get('/testapi', function(req, res, next) {
  res.render('testapi', { title: 'List Recent Reports' });
});

/* TEST: function to GET report list */
router.get('/recentreports', function(req, res){
  request({
    url: url,
    json: true
  }, function (error, response, body) {
      if (!error && response.statusCode === 200) {
        console.log(body) // Print the json response
    }
  })
});

I have tried to define a function /recentreports which is called in the testapi.jade view, however nothing is printed in the console when I load the page and I suspect I am doing something horribly wrong.

My questions are:

1. How do I read the JSON into my app and where does this code go (index.js, app.js, testview.jade etc...?)

2. How do I export the URL I construct from wherever that code lives to my .jade view?

Answer 1

There was nothing logged to the browser console because no response was sent from your server. The response was only logged to the server's console.

You'll need to refactor the code for the 'recentreports' route to send data. You could use a simple res.send call:

...
function (error, response, body) {
  if (!error && response.statusCode === 200) {
    res.send(body) // Send the response to the client
  }
}
...

This response will be received by testapi.jade via an AJAX call to the '/recentreports' route. The AJAX call can be defined in a Javascript file sourced by the testapi.jade file.

The constructed URL would not need to be exported as it exists within the same testapi.jade file (after you've formed it from the results from the AJAX call).