Typeform

Build me a one-question-at-a-time survey app to replace Typeform, personal scale. Requirements: - Node + Express + better-sqlite3 on my VPS behind Caddy. A form is a YAML file in forms/ (types: text, email, select, rating 1-5, yes/no), loaded at request time. No visual builder. - Public page at /s/<slug>: one question on screen, large type, Enter or click to advance, up arrow to go back, progress bar, thank-you screen. Vanilla JS, no framework, works on a phone. - Simple branching: a question may declare next: per answer. One level deep, do not build a logic engine. - Responses saved on completion to SQLite with timestamp and form version. - CSV export at /admin/<slug>.csv behind an ADMIN_TOKEN from .env; optional webhook POST per completed response, URL set in the form's YAML. - Honeypot field and a per-IP rate limit for spam, nothing fancier. - No accounts, no telemetry; respondent data stays in my SQLite file. - Out of scope: a drag-and-drop editor, payments, analytics dashboards, and partial-response capture. Adding a form means dropping a YAML file on the server. - README: Caddy snippet and the YAML form format with one full example.