Fitter Playground

declarative web-data extraction, running as WebAssembly in your browser loading engine… GitHub ↗

Config

Result

Engine loading — the fitter Go binary is compiled to WebAssembly (~7 MB gzipped), first load takes a moment…

Every run executes the real fitter engine — the same code as the CLI and MCP server — entirely client-side. Live HTTP examples use CORS-friendly public APIs (GitHub, OpenLibrary, CoinGecko); arbitrary page scraping and the browser/docker connectors need the native binary. Get it via go install github.com/PxyUp/fitter/cmd/fitter_cli@latest or the MCP server from the README.