Flow Tools

Flow Tools is a GPL-3.0-or-later local data-pipeline designer. It accepts pasted or local JSON/CSV/NDJSON/XML and composes fixed select, rename, filter, map, sort, group, join, type-format, deduplicate, slice and explode primitives. Every stage has an inspectable snapshot, dataset analysis and explicit loss notes. Recipes are deterministic validated JSON; there is no arbitrary code, eval, plugin or network stage.

Limits: 2 MiB sources, 10,000 input rows, 20,000 expanded rows, 200 fields, 30 stages and 256 KiB recipe JSON. Simulation runs in a cancellable worker. Result JSON/CSV, recipes and an inert pipeline SVG export explicitly. Run npm ci, npm run check, npm run test:browser, then npm run package:release -- --force.