JSON to TypeScript (Interfaces)
Paste a sample JSON and get ready-to-use TypeScript interfaces, with inferred types (string, number, boolean, arrays and nested objects). Choose the root type name and copy or download the result.
Input JSON
TypeScript interfaces
How to use: JSON to TS
- 1Paste a sample JSON.
- 2Name the root type.
- 3Copy or download the generated TypeScript interfaces.
What is it for?
- Type API responses in TypeScript projects.
- Save time when integrating external services.
- Document data structures.
From JSON to TypeScript types
Saving work
Paste a sample response and get interfaces with inferred types: string, number, boolean, lists and nested objects.
Review the result
A single example does not reveal optional fields or values that can be null or have several types. Complete the type with ? and unions according to the real API contract.
Runtime validation
TypeScript only checks at compile time. For external data, combine types with runtime validation (for example with a schema) before trusting it.
Related tools
Frequently asked questions
How does it name nested types?+
Each nested object generates its own interface named after the parent plus the capitalized property name. If there are collisions, a number is added.
What does it do with arrays of objects?+
It infers one interface per element using the Item suffix (e.g., RootObjectItem).