Nine tools, no account, nothing stored

A toolbox for numbers, source code and hosts

Convert bases and colours, parse JavaScript, Python, Rust, CSS or JSON into a syntax tree, look up an address, or check a site from nodes around the world.

Browse the tools Open the JSON parser

Output 4 of 9 tools

Decimal → Hex 0xFF

HSL → Hex #D8A13F

IP Lookup AS15169 · Google LLC Ashburn, US

Site Checker 6 of 6 responded median 0.14 s

Convert

2 tools

Decimal → Hex Convert decimal integers to hex, binary and octal with fixed bit widths and two’s complement. HSL → Hex Dial in a hue, saturation and lightness and copy the exact hex, RGB and CSS value.

Parse

5 tools

JS / TS Parser Parse JavaScript and TypeScript with Babel, inspect the AST and read recovery-mode errors. Python Parser Build a concrete syntax tree for Python source and catch structural errors as you type. Rust Parser Inspect the syntax tree of Rust items, expressions and patterns without compiling. CSS Parser Walk rules, selectors, declarations and at-rules as a tree, with error positions. JSON Parser A strict, hand-written JSON parser with precise error offsets plus format and minify.

Network

2 tools

IP Lookup Look up the country, city, network and ASN behind any address or domain. server Site Checker Run HTTP, ping, TCP and DNS checks from nodes around the world via check-host.net. server