lessmark

The markdown alternative that agents (and humans) love.

Use this package when a JavaScript app or CLI needs to parse, validate, format, render, or convert Lessmark documents.

npm install lessmark

import { parseLessmark, validateSource, formatLessmark, renderHtml } from "lessmark";

const source = "# Notes\n\nPlain prose becomes a paragraph.\n";
const ast = parseLessmark(source);
const errors = validateSource(source);
const formatted = formatLessmark(source);
const html = renderHtml(ast, { document: true });

CLI:

lessmark parse file.lmk
lessmark parse --positions file.lmk
lessmark parse -
lessmark check file.lmk
lessmark check docs
lessmark check --json file.lmk
lessmark format file.lmk
lessmark format --check file.lmk
lessmark format --check --json docs
lessmark fix --write docs
lessmark init docs
lessmark skill init code-review
lessmark skill build code-review --target both
lessmark skill install code-review --target codex
lessmark render --document file.lmk
lessmark build --strict input public
lessmark info --json

Use - for stdin. check, format --check, and fix --write also accept directories. parse --positions includes source ranges. init creates a starter docs/index.lmk without overwriting. skill commands author Lessmark skill sources and emit native SKILL.md bundles for agents.

Docs: https://lessmark.org