Validators (input police)

Path: hono-backend/src/validators/

When a client sends JSON, we don’t trust it. Zod schemas check:

• Required fields exist
• Strings are non-empty
• Enums are valid values
• Numbers are in range

Validators run in routes (or services called by routes) before touching the database.

Files

Error formatting

lib/format-zod-issue-path.ts turns Zod errors into friendly field paths for JSON responses.

Adding a new endpoint

1. Define or extend schema in the right file.
2. schema.parse(body) or safeParse in route.
3. On failure → 400 with { error, details } pattern used elsewhere.