Key Points

Syntaqlite Playground is a new interactive web UI that lets users experiment with the syntaqlite project’s abilities for formatting, parsing into an AST, validating, and tokenizing SQLite SQL queries.
The article notes that sytnatqlite (built with C and Rust) has been discussed on Hacker News, alongside a detailed write-up by Lalit Maganti on building it with AI.
The author revisits an earlier research effort that compiled syntaqlite into a WebAssembly wheel to run in Pyodide, and connects that work to the newly available playground experience.
An update highlights that syntaqlite also already has its own standalone WebAssembly playground accessible via a link from the README.
The example screenshot demonstrates SQL validation with structured diagnostics (including suggestions like correcting unknown table names) and error details in JSON.

Simon Willison’s Weblog

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5th April 2026

Tool Syntaqlite Playground

Lalit Maganti's syntaqlite is currently being discussed on Hacker News thanks to Eight years of wanting, three months of building with AI, a deep dive into how it was built.

This inspired me to revisit a research project I ran when Lalit first released it a couple of weeks ago, where I tried it out and then compiled it to a WebAssembly wheel so it could run in Pyodide in a browser (the library itself uses C and Rust).

This new playground loads up the Python library and provides a UI for trying out its different features: formating, parsing into an AST, validating, and tokenizing SQLite SQL queries.