v1.9.4 • Utils • 3kb gzipped • MIT
FormFlow
Validation and multi-step logic that works the same in React, Vue and vanilla. Your markup stays yours.
// why formflow
Headless on purpose
FormFlow never renders anything. It tracks state, runs your rules and tells you what to show, which means it can never fight your design system.
// stack
Framework agnostic
One core plus thin adapters. The vanilla build is the reference implementation; every adapter is under sixty lines.
FormFlow started as a single file in a client project and stayed small on purpose. It does one job, it does it in 3kb gzipped, and it has no runtime dependencies.
Getting started
Install it, import it, call it:
npm i formflow-jsFormFlow never renders anything. It tracks state, runs your rules and tells you what to show, which means it can never fight your design system.
What it does not do
It does not manage your state, style your components or ship a plugin system. Those are your decisions, and keeping them out is what keeps the bundle honest.
- Multi-step branching
- Rules as plain functions
- MIT licensed, commercially friendly
Features
Multi-step branching
Steps can depend on earlier answers. Skipped branches clear their own values so nothing stale is submitted.
Rules as plain functions
A validator takes a value and returns a message or nothing. No schema language to learn.
Tested to the edges
Ninety-eight percent branch coverage, with the awkward cases written first.
Node and browser
One build runs in both, with no conditional exports to get wrong.
Documented properly
Every public function has a worked example, not just a signature.
ESM and types
Ships module and CommonJS builds with hand-written type definitions and source maps.
Get FormFlow v1.9.4
12 files • .min.js 3kb • .zip 83kb • sha384 verified
Changelog
- Async validators now debounce per field
- Fixed step skipping when a branch was cleared
- Vue adapter rewritten in 48 lines
- Node 18 is now the minimum supported version
- CommonJS build restored for older bundlers
- Reworked the public API for consistency
- Deprecated helpers removed
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