Fillament
The form library built for an agent-driven web
Fillament launched on June 4, 2026 with 5 votes, #2,466 of 22,647 launches that month and more than 75% of that year's launches.
What it does
One form serves a human and an AI agent — no extra wiring. Forms describe themselves as a contract an agent can read before filling, return validation errors agents can parse and correct like a 422, and expose themselves as in-browser agent tools. Plus everything you'd want from a modern Formik alternative — type-safe field paths, granular re-renders, Zod/Yup/JSON Schema validation, in-browser AI autofill. Twenty-two tree-shakable packages, or grab @fillament/mega for everything at once.
Fillament is a free, MIT-licensed React form library built for an agent-driven web: forms describe themselves as a contract agents can read before filling, return machine-readable validation errors (path + code) agents correct like a 422, and expose themselves as WebMCP agent tools. Plus type-safe field paths, granular re-renders, Zod / Yup / JSON Schema validation, in-browser AI autofill, form-fl
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