Hyperlark

Write a grammar once. Parse it fast — from Python, Rust, TypeScript, and C.

Choose your language

One grammar language, one engine, the same semantics everywhere — pick where you work.

Pythonimport hyperlark — a fast native parser

Rustuse hyperlark::Lark — the native engine

TypeScript / WASMNode, browser, Deno — import { Lark }

CA minimal, careful C ABI

One grammar, four languages

Write a grammar in the .lark language and parse it from Python, Rust, TypeScript, or C — one Rust engine behind every binding.

LALR and Earley

Both parsers, every lexer (basic / contextual / dynamic), postlex, interactive parsing, and transformers.

Fast, no build step

A native Rust core builds parse tables at runtime — no code generation, and grammars stay loadable at runtime. See the benchmarks.

Try it live

Paste a grammar and parse in your browser — open the playground.