JSON to TypeScript
TypeScriptConvert JSON objects to TypeScript interfaces instantly. Free online json to typescript converter with support for nested interfaces and arrays.
How to convert JSON to TypeScript interfaces
This tool operates as a versatile json to typescript and json to typescript interface. Paste any valid JSON object into the input editor and click Convert. The tool recursively walks your JSON tree and generates a set of TypeScript interface declarations that precisely mirror the data shape. Nested objects are extracted into their own named interfaces and referenced by type, keeping your output clean and composable.
How are TypeScript types inferred from JSON values with JSON TO TYPESCRIPT INTERFACE
Each JSON primitive maps to a TypeScript primitive: strings become string, numbers become number, booleans become boolean, and null values become null. Arrays are typed from their first element - an array of objects becomes an interface array, while a mixed array falls back to unknown[].
Why use a client-side TypeScript generator?
Running the conversion in the browser means your JSON never leaves your machine. There is no API key, no rate limit, and no risk of leaking sensitive schema information. The converter works offline once the page has loaded.
Frequently Asked Questions
How do I use this json to typescript converter?
To generate a json to typescript interface from a JSON sample, paste your JSON data into the input panel. The tool recursively parses the structure and builds interfaces.