maml.js

A tiny, modern, well‑tested implementation of the MAML data format for JavaScript/TypeScript.

• Spec‑accurate parser and pretty serializer
• Zero dependencies, ESM first
• 100% test coverage (statements, branches, lines) verified with Vitest + v8
• Works in Node.js, Deno, Bun, and the browser
• 14x times faster than YAML
• Only 1.79 kB gzipped

Installation

npm install maml.js

Or use the prebuilt bundle maml.min.js.

Usage

Node / Deno

import { parse, stringify } from 'maml.js'

const data = parse(`{
  project: "MAML"
  tags: [
    "minimal"
    "readable"
  ]

  # A simple nested object
  spec: {
    version: 1
    author: "Anton Medvedev"
  }

  notes: """
This is a multiline string.
Keeps formatting as‑is.
"""
}`)

console.log(data.project) // "MAML"

const text = stringify({ foo: 'bar', list: [1, 2, 3] })
/*
{
  foo: "bar"
  list: [
    1
    2
    3
  ]
}
*/

Browser

<script src="maml.min.js"></script>
<script>
    const obj = MAML.parse('{ answer: 42 }')
    console.log(obj.answer)

    const text = MAML.stringify({ greeting: 'hello' })
    console.log(text)
</script>

License

MIT