Browser side version of PDFShift conversion script.

pdfshift.js

// usage:
// pdfshift({'source': 'https://en.wikipedia.org/wiki/PDF', 'use_print': true}, 'your_api_key').then(...)

function pdfshift(data, apiKey) {
    /**
     * Javascript function for PDFShift
     * @param apiKey: Your API key from PDFShift. Optional. Can be null
     * @param data: Parameters to send to PDFShift. Must contains at least the "source"
     */
    return new Promise(function (resolve, reject) {
        var xhr = new XMLHttpRequest();
        xhr.open('POST', 'https://api.pdfshift.io/v2/convert/', true);
        xhr.setRequestHeader("Content-Type", "application/json");

        if (apiKey) {
            xhr.setRequestHeader('Authorization', 'Basic ' + btoa(apiKey + ':'));
        }

        xhr.onreadystatechange = function () {
            if (xhr.readyState === 4) {
                if (xhr.status === 200) {
                    // The request was successful!
                    // The xhr.responseText contains the PDF
                    resolve(xhr.responseText);
                } else {
                    // An error occured!
                    var json = JSON.parse(xhr.responseText);
                    reject(json);
                }
            }
        };

        xhr.send(JSON.stringify(data));
    });
}