JSON to TypeScript Types
Generate TypeScript interfaces and types from any JSON sample.
- 100% client-side · your data never leaves your browser
- Instant, no rate limits
- Free, no sign-up
Your result appears here
Paste JSON into the panel on the left — everything runs privately in your browser.
Overview
JSON to TypeScript — Generate Interfaces from JSON
Generate TypeScript interfaces and type aliases from JSON samples automatically. Paste an API response, OpenAPI example, or config snippet and get export-ready TypeScript types for your frontend, backend, or shared package. JsonDrift infers nested objects, arrays, nullable fields, and union array element types from real data — faster and more accurate than hand-writing types from guesswork.
Why generate TypeScript from JSON?
TypeScript's strength is catching mismatches at compile time. If your types drift from live API responses, you get false confidence. Generating interfaces from actual JSON grounds types in reality — especially valuable after backend changes or when integrating third-party APIs without official SDKs.
What the generator infers
- Nested object interfaces with descriptive names from keys
- Array types from element samples, including union element types
- Optional properties (?) when null appears in the sample
- number vs string vs boolean scalars
- export keyword for drop-in module files
Workflow: sample → types → codebase
Capture a representative API response (success and error shapes if needed). Generate types, paste into types/api.ts, and import across your app. Regenerate when the API version bumps. Pair with JSON Schema validation on the backend for end-to-end contract safety.
Limitations to know
A single sample cannot prove every field always exists — optional fields only reflect nulls in your sample. Unknown future fields are not included until you regenerate from richer samples or loosen types manually.
FAQ
Frequently asked questions
Are optional fields detected?
Null values in the sample produce optional (?) properties in generated interfaces.
Can I name the root type?
Yes. Set the Root name field before generating.
Does it generate types or interfaces?
Nested shapes use interfaces; a type alias appears when the root is a primitive or array wrapper.
Is generated code uploaded anywhere?
No. Generation runs entirely in your browser.
Continue with a related tool
All tools- JSON to C# Class Generator
Generate C# classes with JsonProperty attributes from JSON examples.
- JSON to Go Struct Generator
Infer Go struct definitions with JSON field tags from example JSON.
- JSON to Java Class Generator
Generate Java classes with Jackson annotations from JSON samples.
- JSON to Kotlin Data Class Generator
Generate Kotlin data classes with @SerializedName from JSON samples.
- JSON to Python Converter
Generate Python dict literals or dataclass-style structures from JSON samples.
- JSON to Rust Struct Generator
Generate Rust serde structs with rename attributes from JSON samples.