Perform curl request in javascript?

Question

Is it possible to send a curl request in jQuery or javascript?

Something like this:

curl \
-H 'Authorization: Bearer 6Q************' \
'https://api.wit.ai/message?v=20140826&q='

So, in PHP on submission of a form, like this:

$header = array('Authorization: Bearer 6Q************');
$ch = curl_init("https://api.wit.ai/message?q=".urlEncode($_GET['input']));
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$response = curl_exec($ch);
curl_close($ch);

What I'm trying to do is perform this curl request, which returns json and then I plan on parsing it with jQuery's $.get() function.

Answer 1

curl is a command in linux (and a library in php). Curl typically makes an HTTP request.

What you really want to do is make an HTTP (or XHR) request from javascript.

Using this vocab you'll find a bunch of examples, for starters: Sending authorization headers with jquery and ajax

Essentially you will want to call $.ajax with a few options for the header, etc.

$.ajax({
        url: 'https://api.wit.ai/message?v=20140826&q=',
        beforeSend: function(xhr) {
             xhr.setRequestHeader("Authorization", "Bearer 6QXNMEMFHNY4FJ5ELNFMP5KRW52WFXN5")
        }, success: function(data){
            alert(data);
            //process the JSON data etc
        }
})

Answer 2

You can use JavaScripts Fetch API (available in your browser) to make network requests.

If using node, you will need to install the node-fetch package.

const url = "https://api.wit.ai/message?v=20140826&q=";

const options = {
  headers: {
    Authorization: "Bearer 6Q************"
  }
};

fetch(url, options)
  .then( res => res.json() )
  .then( data => console.log(data) );

Answer 3

Yes, use getJSONP. It's the only way to make cross domain/server async calls. (*Or it will be in the near future). Something like

$.getJSON('your-api-url/validate.php?'+$(this).serialize+'callback=?', function(data){
if(data)console.log(data);
});

The callback parameter will be filled in automatically by the browser, so don't worry.

On the server side ('validate.php') you would have something like this

<?php
if(isset($_GET))
{
//if condition is met
echo $_GET['callback'] . '(' . "{'message' : 'success', 'userID':'69', 'serial' : 'XYZ99UAUGDVD&orwhatever'}". ')';
}
else echo json_encode(array('error'=>'failed'));
?>

Answer 4

The currently accepted answer is for making ajax calls and you may have to deal with cross-site issues.

But if you're just wanting to run Linux curl on the server-side, as you do with PHP, then you can use this.

Here is my function to perform curl requests with nodejs.

It's a simple async function and no special packages outside of node are required. You can do what you want with the resulting data and error or return it to use in another async function.

I just logged for example.

const util = require('util');
const exec = util.promisify(require('child_process').exec);

const goCurl = async (url) => {
    const { stdout, stderr } = await exec(`curl '${url}'`);

    console.log('data:', stdout);
    console.error('err:', stderr);

}


const url = `https://static.canva.com/web/a7a51d4eae8626ead168.ltr.css`;
goCurl(url);