Developer Tools
JSON, regex, naming styles · 9 tools
JSON Formatter
Paste JSON to beautify or minify it instantly; invalid JSON reports the exact error location.
Regex Tester
Test regular expressions with live match highlighting and capture groups, plus built-in examples.
Case Converter
Convert variable names between camelCase, snake_case, kebab-case and more — batch friendly.
CSV ⇄ JSON
Convert CSV to a JSON object array or export a JSON array as standard CSV — live both ways.
JWT Decoder
Paste a JWT to decode its header and payload, with exp/iat converted to readable dates.
SQL Formatter
Beautify SQL statements with proper indentation, dialect support and keyword casing.
YAML ⇄ JSON
Convert YAML config to JSON or back, live, with precise error positions on bad indentation.
Markdown Editor
Write Markdown on the left with a live preview on the right — export HTML, all rendered locally.
Code Formatter
Format JavaScript, CSS and HTML online: beautify indentation and pick your indent width — all locally.