Node.js – Send a binary Buffer to client through http.ServerResponse in Node.js

binaryexpressnode.js

I have a binary data(like image file) in Buffer object(not file), and want to serve the raw binary data to client through http.ServerResponse.
How can I do it ?

Best Answer

I managed to find out the answer. Just add "binary" encoding to both write() and end().

    res.write(buffer,'binary');
    res.end(null, 'binary');

Note that both "write" and "end" function requires the 'binary' encoding specified. Otherwise, the buffer is encoded as UTF-8. (So, JPEG header "ff d8 ff e0" will be "c3 bf c3 98 c3 bf c3 a0"...)

Related Solutions

Javascript – Writing files in Node.js

There are a lot of details in the File System API. The most common way is:

const fs = require('fs');

fs.writeFile("/tmp/test", "Hey there!", function(err) {
    if(err) {
        return console.log(err);
    }
    console.log("The file was saved!");
}); 

// Or
fs.writeFileSync('/tmp/test-sync', 'Hey there!');

Javascript – How to pass command line arguments to a Node.js program

Standard Method (no library)

The arguments are stored in process.argv

Here are the node docs on handling command line args:

process.argv is an array containing the command line arguments. The first element will be 'node', the second element will be the name of the JavaScript file. The next elements will be any additional command line arguments.

// print process.argv
process.argv.forEach(function (val, index, array) {
  console.log(index + ': ' + val);
});

This will generate:

$ node process-2.js one two=three four
0: node
1: /Users/mjr/work/node/process-2.js
2: one
3: two=three
4: four

Best Answer

Related Solutions

Javascript – Writing files in Node.js

Javascript – How to pass command line arguments to a Node.js program

Standard Method (no library)

Related Topic