strict-zod-objects

Why

z.object ignores unknown keys. A contract test built on it keeps passing after the backend adds, renames, or misspells a field — precisely the regression the test existed to catch. z.strictObject fails on unknown keys, which makes the schema an actual assertion about the response.

What to do instead

Use z.strictObject({…}) so an unexpected field in the response fails the test instead of passing silently. If a payload legitimately carries keys you do not model, say so explicitly with .passthrough() and leave a comment naming the reason.

Examples

// ✗ strict-zod-objects
const User = z.object({ id: z.string() });

// ✓
const User = z.strictObject({ id: z.string() });