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Return MIDI or Locator data from Ablton .als files






npm i @stnew/ableton-parser


To use with Node.js, pass a file path or URL to the .als file in the Ableton constructor:

import Ableton from '@stnew/ableton-parser'

const parser = new Ableton('/path/to/file.als')


  • getMidiTrack - Returns a promise containing MIDI note timecodes
  • getLocatorData - Returns a promise containing Locator timecodes, names, and annotations
  • getDuration - Returns a promise containing track duration


const handler = async (req, res) => {
  const parser = new Ableton(req.url);

  const midi = await parser.getMidiTrack();
  const duration = await parser.getDuration();

  const data = {

  res.setHeader('Content-Type', 'application/json');
  res.statusCode = 200;


Install globally to process files via command-line:

npm i -g @stnew/ableton-parser


  -h, --help      Show help                                            [boolean]
  -v, --version   Show version number                                  [boolean]
  -m, --midi      Extract MIDI note timecodes                          [boolean]
  -l, --locators  Extract Locator timecodes, names, and annotations    [boolean]
  -d, --duration  Extract track duration                               [boolean]


You must specify a flag and a file path or url to the .als file

  ableton --midi path/to/file.als
  ableton -mld