Can a prompt replace Feathery?

Build a headless form-logic engine — Feathery's actual developer-facing idea — rather than a visual form builder. Use Next.js/TypeScript for the backend API and Postgres for storage. Define a form as a JSON schema: fields (type, label, validation rules) and conditional branching rules, such as showing field X only if field Y equals a value. Expose a small REST API, or a React hook wrapping it, that a separate consuming app can use to fetch a form's current schema, submit validated responses field-by-field or as a batch, and resume a partially-completed submission by ID. Handle validation and branching logic entirely server-side, so the consuming app's UI can be anything — the point is that this project supplies the logic, not the visual design. Build one example consuming React app demonstrating the pattern, rendering fields from the schema and showing or hiding based on branching, but keep it clearly separate from the core engine. Store submissions in Postgres with completion status and timestamps. Do not build a visual no-code form builder, a hosted-page product, or a library of pre-built integrations — those are out of scope; this is a logic layer for developers building their own form UI. Requires hosting and a database; no external API key needed.