Developer Tools
Everyday developer utilities: JSON formatting, UUID generation, timestamp conversion and JWT decoding.
JSON Formatter
Format, validate and minify JSON online. Pretty-print with 2 or 4 spaces, get precise error positions, and copy or download the result.
UUID Generator
Generate random UUID v4 and time-ordered UUID v7 identifiers in bulk, using the browser cryptographic random API. Copy one or all with a click.
Unix Timestamp Converter
Convert Unix timestamps to readable dates and back. Shows local time, UTC and ISO 8601, handles both seconds and milliseconds, with a live current-time display.
JWT Decoder
Decode JWT header and payload into readable JSON, with expiry and issue dates converted to human-readable form.
Cron Expression Parser
Parse and generate cron expressions online for Linux crontab, Spring @Scheduled and Quartz. Per-field breakdown, plain-language schedule and next run times.
Number Base Converter
Convert numbers between binary, octal, decimal, hex and any base from 2 to 36 instantly. Live results as you type.
User-Agent Parser
Parse any User-Agent string into browser, engine, OS, device and CPU details. Your own UA is pre-filled.
JSON to Entity Classes
Generate typed entity classes from JSON for TypeScript, Java, Go, C#, Python, Kotlin and Swift. Nested objects become separate classes.
Excel & CSV Converter
Convert .xlsx files to CSV (per sheet) and CSV text or files back to Excel workbooks. Parsing via SheetJS.
Large Log Viewer
Open huge log files (hundreds of MB) streamed in the browser, with instant level counts and keyword search.
SQL Playground
Run real SQLite queries in the browser: a demo database to explore, sample queries, and instant result tables. Powered by sql.js WASM.
XML Formatter
Format, validate and minify XML with a collapsible tree: pretty-print with 2/4 spaces or tabs, jump to syntax errors by line and column, copy or download the result.
YAML Formatter
Format and validate YAML (.yml) with a collapsible tree: normalize indentation, jump to syntax errors by line and column, multi-document files supported, plus a compact flow-style output.
CSS Formatter & Minifier
Beautify or minify a stylesheet with a quote- and comment-aware parser: calc(), content strings, data URIs and selector whitespace stay intact. Shows byte savings and a semantic consistency check.