Browser ID3 Writer

JavaScript library for writing ID3 (v2.3) tag to MP3 files in browsers and Node.js. It can’t read the tag so use another lib to do it.

Note: the library removes existing ID3 tag (v2.2, v2.3 and v2.4).

Here is an online demonstration: egoroof.github.io/browser-id3-writer/

Find the changelog in CHANGELOG.md

Table of Contents

• Installation
  • JS modules
• Usage
  • Browser
    1. Get ArrayBuffer of song
    2. Add a tag
    3. Save file
    4. Memory control
  • Node.js
• Supported frames
• APIC picture types
• SYLT content types
• SYLT timestamp formats

Installation

Take latest version here or with npm:

npm install browser-id3-writer --save

JS modules

The library is only deployed in native JS modules, so in browsers you have to use script with type module:

<script type="module">
  import { ID3Writer } from 'https://your-host/browser-id3-writer.mjs';
  // your code here..
</script>

Or bundle the library to your code.

In Nodejs it imports easily:

import { ID3Writer } from 'browser-id3-writer';

Usage

Browser

Get ArrayBuffer of song

In browsers you should first get ArrayBuffer of the song you would like to add ID3 tag.

FileReader

For example you can create file input and use FileReader:

<input type="file" id="file" accept="audio/mpeg" />
<script type="module">
  import { ID3Writer } from 'https://your-host/browser-id3-writer.mjs';

  document.getElementById('file').addEventListener('change', function () {
    if (this.files.length === 0) {
      return;
    }
    const reader = new FileReader();
    reader.onload = function () {
      const arrayBuffer = reader.result;
      // go next
    };
    reader.onerror = function () {
      // handle error
      console.error('Reader error', reader.error);
    };
    reader.readAsArrayBuffer(this.files[0]);
  });
</script>

Fetch

To get arrayBuffer from a remote server you can use Fetch:

const request = await fetch(urlToSongFile);
if (!request.ok) {
  // handle error
  console.error(`Unable to fetch ${urlToSongFile}`);
}
const arrayBuffer = await request.arrayBuffer();
// go next

Add a tag

Create a new ID3Writer instance with arrayBuffer of your song, set frames and add a tag:

// arrayBuffer of song or empty arrayBuffer if you just want only id3 tag without song
const writer = new ID3Writer(arrayBuffer);
writer
  .setFrame('TIT2', 'Home')
  .setFrame('TPE1', ['Eminem', '50 Cent'])
  .setFrame('TALB', 'Friday Night Lights')
  .setFrame('TYER', 2004)
  .setFrame('TRCK', '6/8')
  .setFrame('TCON', ['Soundtrack'])
  .setFrame('TBPM', 128)
  .setFrame('WPAY', 'https://google.com')
  .setFrame('TKEY', 'Fbm')
  .setFrame('APIC', {
    type: 3,
    data: coverArrayBuffer,
    description: 'Super picture',
  });
writer.addTag();

Save file

Now you can save it to file as you want:

const taggedSongBuffer = writer.arrayBuffer;
const blob = writer.getBlob();
const url = writer.getURL();

For example you can save file using FileSaver.js:

saveAs(blob, 'song with tags.mp3');

If you are writing chromium extension you can save file using Downloads API:

chrome.downloads.download({
  url: url,
  filename: 'song with tags.mp3',
});

Memory control

When you generate URLs via writer.getURL() you should know that whole file is kept in memory until you close the page or move to another one. So if you generate lots of URLs in a single page you should manually free memory after you finish downloading file:

URL.revokeObjectURL(url); // if you know url or
writer.revokeURL(); // if you have access to writer

Node.js

Simple example with blocking IO:

import { ID3Writer } from 'browser-id3-writer';
import { readFileSync, writeFileSync } from 'fs';

const songBuffer = readFileSync('path_to_song.mp3');
const coverBuffer = readFileSync('path_to_cover.jpg');

const writer = new ID3Writer(songBuffer);
writer
  .setFrame('TIT2', 'Home')
  .setFrame('TPE1', ['Eminem', '50 Cent'])
  .setFrame('TALB', 'Friday Night Lights')
  .setFrame('TYER', 2004)
  .setFrame('APIC', {
    type: 3,
    data: coverBuffer,
    description: 'Super picture',
  });
writer.addTag();

const taggedSongBuffer = Buffer.from(writer.arrayBuffer);
writeFileSync('song_with_tags.mp3', taggedSongBuffer);

You can also create only ID3 tag without song and use it as you want:

const writer = new ID3Writer(Buffer.alloc(0));
writer.padding = 0; // default 4096
writer.setFrame('TIT2', 'Home');
writer.addTag();
const id3Buffer = Buffer.from(writer.arrayBuffer);

Supported frames

array of strings:

• TPE1 (song artists)
• TCOM (song composers)
• TCON (song genres)

string

• TLAN (language)
• TIT1 (content group description)
• TIT2 (song title)
• TIT3 (song subtitle)
• TALB (album title)
• TPE2 (album artist)
• TPE3 (conductor/performer refinement)
• TPE4 (interpreted, remixed, or otherwise modified by)
• TRCK (song number in album): ‘5’ or ‘5/10’
• TPOS (album disc number): ‘1’ or ‘1/3’
• TPUB (label name)
• TKEY (initial key)
• TMED (media type)
• TDAT (album release date expressed as ‘DDMM’)
• TSRC (isrc - international standard recording code)
• TCOP (copyright message)
• TCMP (iTunes compilation flag)
• TEXT (lyricist / text writer)
• WCOM (commercial information)
• WCOP (copyright/Legal information)
• WOAF (official audio file webpage)
• WOAR (official artist/performer webpage)
• WOAS (official audio source webpage)
• WORS (official internet radio station homepage)
• WPAY (payment)
• WPUB (publishers official webpage)

integer

• TLEN (song duration in milliseconds)
• TYER (album release year)
• TBPM (beats per minute)

object

• COMM (comments):

writer.setFrame('COMM', {
  description: 'description here',
  text: 'text here',
  language: 'eng',
});

• USLT (unsychronised lyrics):

writer.setFrame('USLT', {
  description: 'description here',
  lyrics: 'lyrics here',
  language: 'eng',
});

• IPLS (involved people list):

writer.setFrame('IPLS', [
  ['role', 'name'],
  ['role', 'name'],
  // ...
]);

• SYLT (synchronised lyrics):

writer.setFrame('SYLT', {
  type: 1,
  text: [
    ['lyrics here', 0],
    ['lyrics here', 3500],
    // ...
  ],
  timestampFormat: 2,
  language: 'eng',
  description: 'description',
});

text is an array of arrays of string and integer.

• TXXX (user defined text):

writer.setFrame('TXXX', {
  description: 'description here',
  value: 'value here',
});

• PRIV (private frame):

writer.setFrame('PRIV', {
  id: 'identifier',
  data: dataArrayBuffer,
});

• APIC (attached picture):

writer.setFrame('APIC', {
  type: 3,
  data: coverArrayBuffer,
  description: 'description here',
  useUnicodeEncoding: false,
});

useUnicodeEncoding should only be true when description contains non-Western characters. When it’s set to true some program might not be able to read the picture correctly. See #42.

APIC picture types

Type Name 0 Other 1 32x32 pixels ‘file icon’ (PNG only) 2 Other file icon 3 Cover (front) 4 Cover (back) 5 Leaflet page 6 Media (e.g. label side of CD) 7 Lead artist/lead performer/soloist 8 Artist/performer 9 Conductor 10 Band/Orchestra 11 Composer 12 Lyricist/text writer 13 Recording location 14 During recording 15 During performance 16 Movie/video screen capture 17 A bright coloured fish 18 Illustration 19 Band/artist logotype 20 Publisher/Studio logotype

SYLT content types

Type Name 0 Other 1 Lyrics 2 Text transcription 3 Movement/part name (e.g. “Adagio”) 4 Events (e.g. “Don Quijote enters the stage”) 5 Chord (e.g. “Bb F Fsus”) 6 Trivia/‘pop up’ information

SYLT timestamp formats

Type Name 1 Absolute time, 32 bit sized, using MPEG frames as unit 2 Absolute time, 32 bit sized, using milliseconds as unit