Dummy TypeScript Interface Generator

How to use

1. 1️⃣
   Choose your options above
2. 2️⃣
   Click Generate
3. 3️⃣
   Copy your result

Detailed instructions

1. Set the Number of Fields slider to however many properties you want the interface to contain.
2. Choose whether to include optional fields — select 'yes' for realistic partial shapes, 'no' for fully required interfaces.
3. Click Generate to produce a random, syntactically correct TypeScript interface.
4. Copy the output and paste it into your `.ts` or `.tsx` file as a starting scaffold.
5. Rename fields to match your domain and adjust any types that don't fit your data model.

Use Cases

• •Scaffolding typed API response shapes in a Next.js project before the backend contract is finalized
• •Generating Jest or Vitest fixture types that cover both required and optional fields in one pass
• •Drafting a Zustand store interface quickly, then renaming fields to match your actual domain
• •Creating realistic prop types for Storybook stories when the real component model isn't ready yet
• •Producing varied interface examples for a TypeScript tutorial or dev blog post without writing them by hand

Tips

• →Generate with optional fields enabled when prototyping PATCH endpoints — those payloads almost always have partial shapes.
• →Run the generator two or three times and merge the best field names from each result rather than accepting the first output as final.
• →If you need a nested type, generate two interfaces separately and replace one field's type with the second interface name.
• →For Jest fixtures, generate an interface with 8 fields, then use it to type a const mock object — the compiler will flag any fields you forget to populate.
• →When teaching TypeScript, generate a fresh interface each lesson to keep examples varied and prevent students from memorising a single example.
• →Disable optional fields when generating a base interface, then re-enable them to generate a matching partial type — useful for update/edit form models.

FAQ