JSON to TypeScript

Why Generate TypeScript Interfaces from JSON?

Hand-writing TypeScript types for an API response or config file is slow and error-prone. This tool parses real JSON and recursively infers matching interface declarations — nested objects become their own named interfaces, and arrays of objects are merged into a single shape with optional fields where items disagree.

Features

  • Nested interfaces — every nested object gets its own named, reusable interface.
  • Array merging — arrays of objects merge all observed fields, marking inconsistent ones optional.
  • Custom root name — name the top-level interface to match your codebase conventions.
  • Copy to clipboard — paste straight into a .ts file.

Common Use Cases

  • Typing an API response you don't control without writing it by hand.
  • Bootstrapping types for a new integration from a sample payload.
  • Keeping TypeScript types in sync after an API shape changes.

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