JSON
{"a":1}TypeScript
export interface RootObject { a: number }Developer Tools
JSON to TypeScript Interface Generator
Infer TypeScript interface definitions from JSON in your browser. Nested objects become separate interfaces, with options for the root name, optional fields, readonly, export, and type aliases.
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JSON to TypeScript Interface
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Use cases
- Fill in frontend types from API response JSON
- Avoid missing fields or wrong types when writing types by hand
- Turn sample payloads into shared DTO definitions
How to use
- Paste JSON data
- Set the root interface name and toggle all-optional if needed
- Copy the generated interface code
Example input and output
FAQ
What if a field name is not a valid identifier?
Names that start with digits are normalized with a prefix so the output compiles; review special fields after generation.
How are nested objects handled?
Each nested object becomes its own interface with cross-references; arrays are inferred from element types.
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