Developer Utilities

Regex Tester

Test JavaScript regular expressions with live highlights, groups and explanations.

Runs entirely in your browser: nothing you paste or upload is sent to a server.

Related: regex, regexp, regular expression, pattern, match, capture group, test

More developer utilities

• SQL Formatter — Format or minify SQL for PostgreSQL, MySQL, SQLite, BigQuery and more.
• Code Formatter — Prettier in the browser for JavaScript, TypeScript, CSS, HTML, JSON, Markdown and YAML.
• API Response Inspector — Profile a JSON response: shape, array statistics, value search and path extraction.
• HTTP Header Parser — Parse raw request/response headers and audit common security headers.
• Env File Tool — Parse, validate, sort and compare .env files — secrets masked by default.
• Data Size Converter — Convert between bytes, KB/MB/GB (decimal) and KiB/MiB/GiB (binary).
• Number Base Converter — Arbitrary-precision conversion between binary, octal, decimal, hex and bases 2–36.