8 tools
Web & Network Developer Tools
Inspect the networking and browser details behind a request: parse a URL into its components, decode a User-Agent string, calculate an IPv4 subnet’s usable range, explain what a cron expression schedules or build one from scratch with checkboxes, check an npm package’s real install size, look up ASCII/Unicode keycodes, and see what your browser exposes via fingerprinting.
- Bundle Size CheckerCheck an npm package's real gzipped size, README and project health, or size a whole package.json at once.
- ASCII, Unicode & Keycode InspectorBrowse the ASCII table, look up any Unicode character's code point and encoding, and see live keydown events.
- Cron Expression ExplainerExplain a cron expression in plain English and see its next run times.
- Cron GeneratorBuild a cron expression with checkboxes and dropdowns instead of writing it by hand.
- CIDR / Subnet CalculatorCalculate network address, broadcast address, host range and mask from a CIDR block.
- User-Agent ParserParse a User-Agent string into browser, OS, rendering engine and device type.
- URL ParserDecompose a URL into its parts and edit its query parameters live.
- Browser Fingerprint InspectorShows what your browser reveals via JavaScript, plus what the server already sees — IP, headers, fonts, and more.
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