<html>
	<body>
		<script src="wpcom-xhr-request.js"></script>
		<script>
			WPCOM.xhr( '/me', function ( err, data ) {
				if ( err ) throw err;

				var div = document.createElement( 'div' );
				div.innerHTML = 'Your WordPress.com "username" is: <b>@' + data.username + '<\/b>';
				document.body.appendChild( div );
			} );
		</script>
	</body>
</html>

API

wpcomXhrRequest( [params], fn )

Params: optional parameters

method: GET as default.
apiNamespace: WP-API namepsace.
apiVersion: REST-API app version - 1 as default.
proxyOrigin: https://public-api.wordpress.com as default.
token: token authentication.
query: object used to pass the query to the request.
body: object used to pass the body to the request.
form-data: POST FormData (for multipart/form-data, usually a file upload).
processResponseInEnvelopeMode: default TRUE.

fn: request callback function

This function has three parameters:

error: defined if the request fails
body: the object body of the response
headers: the headers of the response

import handler from 'wpcom-xhr-request';

// get .com blog data usign `REST-API`
handler( '/sites/en.blog.wordpress.com', ( error, body, headers ) => {
	if ( error ) {
		return console.error( 'Request failed: ', error );
	}

	console.log( 'WordPress blog: ', body );
} );

// get .com blog data using `WP-API`
handler(
	{
		path: '/sites/en.blog.wordpress.com',
		apiNamespace: 'wp/v2',
	},
	( error, body, headers ) => {
		if ( error ) {
			return console.error( 'Request failed: ', error );
		}

		console.log( 'WordPress blog: ', body );
	}
);

// get .org blog data (`WP-API`)
handler(
	{
		proxyOrigin: 'http://myblog.org/wp-json',
		path: '/',
		apiNamespace: 'wp/v2',
	},
	( error, body, headers ) => {
		if ( error ) {
			return console.error( 'Request failed: ', error );
		}

		console.log( 'WordPress blog: ', body );
	}
);

Authentication

For API requests that require authentication to WordPress.com, you must pass in an OAuth token as the token parameter in the params object for the API call.

You can get an OAuth token server-side through node-wpcom-oauth, or any other OAuth2 interaction mechanism.