TypeScript Interface Generator
Builds a TypeScript interface from a name and a list of typed fields
About this generator
Every time you sketch a new data model or API response shape in TypeScript you face the same friction: open a brace, indent each field, add a colon, pick a type, close with a semicolon, repeat. This generator removes that friction by turning a comma-separated list into a properly formatted interface in one step. Enter the interface name — the first letter is capitalised to follow PascalCase — then list your fields as name:type pairs separated by commas. The type after the colon is used verbatim, so you can write id:number, status:"open"|"closed", or items:Item[]. Field names are stripped of invalid identifier characters. Any field without a colon defaults to string. An empty fields input produces a single id: number placeholder. Copy the output into a .ts file and extend as needed — add optional markers with ?, generics, or method signatures.
How to use
- Enter the interface name.
- List your fields as name:type pairs, separated by commas.
- Click Generate to produce the formatted interface.
- Copy the result into your editor and refine the types.
Use Cases
- •Scaffolding a type for an API response shape
- •Defining component props as a TypeScript interface
- •Turning a quick field list into a clean data model
- •Teaching how TypeScript interfaces are structured
- •Saving boilerplate when sketching out several types
Tips
- →Add a question mark to a field name, like email?, for an optional property.
- →Use array syntax like tags:string[] directly in the type.
- →Capitalise the interface name to follow the PascalCase convention.
- →Review and tighten the generated types before relying on them.
FAQ
how do I mark a field as optional
Add a question mark to the field name before the colon — write email?:string and the output will include email?: string. The generator preserves the question mark as part of the identifier, which is valid TypeScript for optional properties.
can I use union or array types in the field list
Yes. The type after the colon is placed verbatim, so status:"open"|"closed" and tags:string[] both work. The generator does not validate the type expression, so make sure it is syntactically valid TypeScript.
what happens if I leave the fields input empty
The generator falls back to a single id: number field as a placeholder, so the output is always a valid interface. Add your real fields and regenerate.
does it generate classes or just interfaces
Only interfaces. The output always uses the interface keyword. If you need a class with methods or a constructor, use the interface as a starting point and convert it manually.
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