javascript - Writing an image to file, received over an HTTP request in Node -

i'm i'm missing obvious, gist of problem i'm receiving png mapbox call intent of writing file system , serving client. i've relayed call, received response of raw data , written file. problem file ends truncated no matter path take, , i've exhausted answers i've found skirting subject. i've dumped raw response log, , it's robust, file make tends chunk's worth of unreadable data.

here's code i've got @ present file making. tried buffer move last ditch after several failed , comparably fruitless iterations. appreciated.

module.exports = function(req, res, cb) {     var cartography = function() {         return https.get({             hostname: 'api.mapbox.com',             path: '/v4/mapbox.wheatpaste/' + req.body[0] + ',' + req.body[1] + ',6/750x350.png?access_token=' + process.env.mapbox_api         }, function(res) {             var body = '';             res.on('data', function(chunk) {                 body += chunk;             });             res.on('end', function() {                 var mappath = 'map' + req.body[0] + req.body[1] + '.png';                 var map = new buffer(body, 'base64');                 fs.writefile(__dirname + '/client/images/maps/' + mappath, map, 'base64', function(err) {                     if (err) throw err;                     cb(mappath);                 })             })         });     };     cartography(); }; 

it possible rewrite code in more compact subroutine:

    const fs = require('fs');     const https = require('https');      https.get(url, (response)=> { //request         if(response) {             let imagename = 'image.png'; // purpose use crypto             response.pipe( //pipe response write stream (file)                 fs.createwritestream( //create write stream                     './public/' + imagename //create file name image.png                 )             );             return imagename; //if public folder set default in app.js         } else {             return false;         }     }) 

you original name , extension url, safer generate new name crypto , file extension said url or read-chunk , file-type modules.