Fetching API data with Node JS

Question

I am trying to fetch API data using Node JS. I am using this node package to do so.

https://www.npmjs.com/package/cryptocompare

The documentation of that package is easy enough.

global.fetch = require('node-fetch')
const cc = require('cryptocompare')

cc.price('BTC', ['USD', 'EUR'])
.then(prices => {
  console.log(prices)
})
.catch(console.error)

I've tested it with npm.runkit.com and it works.

However, when I install the package into my app, I don't see any output in the console.

I am using JetBrains WebStorm and these are the steps I've taken.

Create New Express App
npm install -g express-generator
npm install --save node-fetch
npm install --save cryptocompare
npm install

Then within /routes/index.js I added the following

var express = require('express');
var router = express.Router();
global.fetch = require('node-fetch');
const cc = require('cryptocompare');

/* GET home page. */

cc.price('BTC', ['USD'])
    .then(prices => {
        console.log(prices)
}).catch(console.error);

router.get('/', function(req, res, next) {
    res.render('index', {
      title: 'Example'
    });
});

module.exports = router;

But that displays nothing in the console log. I tried moving the global.fetch to app.js in the root directory but that didn't do anything either.

What am I doing wrong here?

Try getting rid of the square brackets in your second example. The documentation doesn't have them. — spicypumpkin
– spicypumpkin, Commented Jul 31, 2017 at 15:55
mmhm it's different from the example under "passing a single pair of currencies" — spicypumpkin
– spicypumpkin, Commented Jul 31, 2017 at 16:00
It's all the same, you can still pass 1 item in an array. In any case, removing the square brackets doesn't do much. — Halnex
– Halnex, Commented Jul 31, 2017 at 16:01

ManishKumar · Accepted Answer · 2017-07-31 16:40:10Z

2

    var express = require('express');
    var router = express.Router();
    global.fetch = require('node-fetch');
    const cc = require('cryptocompare');

    /* GET home page. */


    router.get('/', function(req, res, next) {
cc.price('BTC', ['USD'])
        .then(prices => {
    res.render('index', {
          title: prices
        });
    }).catch(console.error);

    });

    module.exports = router;

This will work for you

answered Jul 31, 2017 at 16:40

ManishKumar

1,5852 gold badges16 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Halnex Over a year ago

This returns [object Object] for the title

Halnex Over a year ago

Fantastic. I am new to the MEAN stack. I really appreciate your patience.

ManishKumar Over a year ago

@Halnex, No Problem. if you want i can email you a book which is really nice and easy to understand. Let me know if you need.

ManishKumar · Accepted Answer · 2017-07-31 16:36:01Z

1

Not sure why you are not getting anything. I tried with same steps and got the result.

I just did one thing differently, i pasted whole code in a file named as abc.js.

and then i ran it in command line like this

node abc.js

and i got this result

{ USD: 2797.06 }

Can you please try it again because its working awesome for me. Let me know if you face any problem.

Continue...

So if you want to use it in index.js then you can do something like this

cc.price('BTC', ['USD'])
    .then(function(prices){
        console.log(prices)
}).catch(function(error){
console.log(error);
});

I just changed its syntex from es6 to es5

edited Jul 31, 2017 at 16:36

answered Jul 31, 2017 at 16:13

ManishKumar

1,5852 gold badges16 silver badges24 bronze badges

6 Comments

Halnex Over a year ago

Yes, I just tested this and it works. But I would like to pass the data to index.js route instead and eventually be able to print out the data on the page instead of the console.

spicypumpkin Over a year ago

@Halnex Oh, wait, I assumed you were looking at your IDE's console. You are fetching the data outside of the router, which means this is happening immediately as your server starts running. If you move the fetch call to inside the router and render inside the fetch callback you should see the data in your browser's console.

Halnex Over a year ago

@spicypumpkin I've been trying to move it inside the router and render on index.js but the IDE keeps throwing syntax errors. I can't move the fetch snippet inside an array where the title is.

spicypumpkin Over a year ago

@Halnex What array? You should be able to access the prices through closure or as an object property. Can you tell me where the syntax error is? Maybe edit it into your original question and I can post a legitimate answer.

Halnex Over a year ago

res.render('index', { title: 'Example' }); This array. Let's say I want to print the price instead of Example - passing cc.price('BTC', 'USD') returns [object Promise] - I am new to the MEAN stack, I would appreciate an example.

|

Collectives™ on Stack Overflow

Fetching API data with Node JS

2 Answers 2

3 Comments

6 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

6 Comments

Your Answer

Sign up or log in

Post as a guest

Related