How to Load and save image using node.js?

Question

A have this code:

var http = require('http');
var fs = require('fs');
var data;
var options = {
  host: 'nodejs.org',
  port: 80,
  path: '/images/logo.png',
  method: 'GET'
};
var req = http.request(options, function(res) {
  res.on('data', function (chunk) {
    data += chunk;
  });
  res.on('end', function () {
    fs.writeFile('1.png', data, function (err) {
      if(err) 
        console.log('NNOOOOOOOOOOOO');
    });
  });
});
req.on('error', function(e) {
  console.log('error: ' + e.message);
});
req.end();

This script create file 1.png and save got data but I can't open it in Windows.

Please, help.

user568109 · Accepted Answer · 2013-06-01 04:59:19Z

2

You can do this :

var req = http.request(options, function(res) {
  var file = fs.createWriteStream('1.png');
  res.pipe(file);
});
req.on('error', function(e) {
  console.log('error: ' + e.message);
});
req.end();

Update

I checked your code and found two things :

The data is not properly initialised.
Use setEncoding to treat response as binary. Don't need to specify encoding in writeFile

So just add these two lines in beginning of http.request callback :

  res.setEncoding("binary") ;
  var data='';

Then your code should work fine.

edited Jun 1, 2013 at 4:59

answered May 31, 2013 at 15:14

user568109

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2 Comments

user568109 Over a year ago

@Sable Added the explanation

RPG Over a year ago

Just saying - after fixing the code with this solution - the file doesn't open because nodejs.org/images/logo.png returning "301 Moved Permanently" and saving the headers into the file.

travis · Accepted Answer · 2013-05-31 16:02:25Z

1

You need to set the proper encoding.

res.setEncoding('binary')


fs.writeFile('1.png', data, {encoding: 'binary'}, function(err){

edited May 31, 2013 at 16:02

answered May 31, 2013 at 15:06

travis

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3 Comments

Sable Over a year ago

Windows still can't open this file.

travis Over a year ago

I can't test this at the moment, which is why there was a small bug in the code I supplied. The writeFile takes an object as an option and not just a string. Still can't test this, but that might be the issue.

Ankur Soni Over a year ago

any update on this? what and how to provide the encoding for saving image?

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