Development & APIs
Format and validate JSON, test regular expressions, generate UUIDs — quick, accurate helpers for developers.
7 tools
Diff Tool — Text & Code Compare
Paste or drop two versions and see added and removed lines, plus the exact words that changed inside each line. Copy or save the result as a unified patch. Nothing leaves your browser.
UUID / ULID / NanoID / Token Generator
A UUID is ready the moment the page opens. Switch to UUID v7, ULID, NanoID or a random token, generate up to 10,000 at once and save them as .txt, .csv or .json. Paste an existing UUID or ULID to read its embedded time and version.
JSON Studio — Formatter & Validator
Paste JSON to format, minify or validate it instantly. Errors are shown with the exact line, column and cause, and comments or trailing commas can be auto-repaired. Your data never leaves your device.
Regex Tester
Type a pattern and matches light up in the test string instantly. Capture groups, replacement output and what each part of the pattern means are all on one screen — and patterns that would freeze your browser are stopped after one second.
Code Formatter — Format & Minify
Paste code to format it with the language auto-detected. Choose indent, line width, semicolons, quotes and trailing commas; JavaScript, CSS and HTML can also be minified with before/after size and reduction. Your code never leaves the browser.
XML Studio — Formatter & Validator
Paste XML to format, minify or validate it. Errors show the exact line, column and cause, and whitespace that carries meaning (mixed content, xml:space) is never touched. XPath search and JSON conversion are on the same screen. Your data never leaves your device.
YAML / TOML Studio — Validate, Format & Convert
Paste YAML, TOML or JSON to validate, format or convert it. Errors show the exact line and column, and type traps such as “no becomes false” and anything lost in conversion are flagged up front. Your data never leaves your device.