---
title: "Playground · tabnas"
description: "Write ABNF or a rule table, parse sample input, and inspect the syntax tree and value in your browser."
source: "https://tabnas.dev/playground/"
---

# Playground

Write a grammar, type some input, and see what tabnas makes of it: the syntax tree and the value your actions build. Runs the real `@tabnas/parser` and `@tabnas/abnf` in your browser.

ABNF Rule table (JS)

Presets: Reset Copy share link

Grammar (ABNF) Input

Result

**This shared link contains a JS rule table.** Running it executes its action functions in your browser. Read the grammar on the left first.

Run it

What went wrong

Value

Syntax tree

Parsing runs in your browser. The share button puts the grammar and input in the URL fragment, so anyone with the link can read them.