Paste dirty code.
Get clean output.
Free developer tools. No signup. No tracking.
Tools
JSON Formatter
Format & validate JSON
JSON ↔ CSV Converter
Convert JSON to CSV and back
SQL Formatter
Beautify SQL queries
Cron Generator
Build cron expressions
Regex Tester
Test & explain regex
JSON ↔ TOON
Convert JSON to TOON & see token savings
Token Counter
Count tokens & estimate API costs
Prompt Formatter
Structure & export LLM prompts
Context Window Planner
Plan your LLM context budget
About CodeScrub
CodeScrub is a collection of fast, no-nonsense online developer tools for the day-to-day work of building software. Format and validate JSON, beautify SQL queries, test regular expressions, and decode cron expressions — all in the browser, with nothing sent to a server.
Every tool here runs entirely client-side. Your data never leaves your machine, there is no account to create, and there is nothing to install. Paste what you have, get back what you need, move on.
Built with a developer's patience in mind: dark interface, monospace fonts where they matter, instant feedback, and clean output you can copy with a single click. New tools are shipping regularly — if there's one you want, it's probably on the list.