I got tired of faker mocks silently breaking my tests, so I built zodmint

You know the pattern: you write a factory with faker, tests pass locally, then CI blows up because faker.number.int() generated a negative value that fails your .positive() constraint. The mock was lying the whole time.

I built zodmint to fix this. You pass a Zod schema in, you get a valid value out, guaranteed to pass schema.safeParse(output).success === true. No faker, no hand-written factories.

npm install zodmint

Basic usage:

const UserSchema = z.object({ id: z.uuid(), email: z.string().email(), age: z.number().int().min(18).max(99), role: z.enum([“admin”, “user”, “guest”]), });

mock(UserSchema); // { id: ‘b48653da-…’, email: ‘isabella89@fixture.dev’, age: 41, role: ‘admin’ }

It also has:

• *mockFactory()* with named states, *afterBuild* hook, and *extend()*
• Seeded generation (same seed = same output, great for snapshots)
• Edge mode (boundary values for stress testing)
• Custom matchers and a plugin system for domain-specific values
• Full support for *z.union*, *z.discriminatedUnion*, *z.intersection*, *z.lazy*, *z.refine*, and more

Got some downloads in the first 24h without posting anywhere which surprised me. Would love feedback from people actually using it.

• npm: https://www.npmjs.com/package/zodmint
• GitHub: https://github.com/gonll/zodmint