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JSON to TypeScript

Infer TypeScript interfaces or types from JSON samples. Nested interfaces, optional nulls, readonly, export toggle, and .json import.

PrivateIn your browserInstantUnlimited
Valid JSON

Nested objects become separate interfaces when Named nested types is on. Null values become optional properties. Mixed-type arrays become union element types.

How it works

1

Paste or import JSON

Paste a JSON sample or import a .json file up to 5 MB. Invalid JSON is flagged live before you convert.

2

Choose output shape

Pick interface or type alias, set the root name (e.g. ApiResponse), and toggle export, nested interfaces, optional nulls, or readonly properties.

3

Convert and export

Click Convert (counts toward the daily limit). Copy the TypeScript or download a .ts file.

Why generate TypeScript from JSON?

APIs and config files often arrive as JSON. Generating types from a real sample is faster than hand-writing interfaces and catches nested structures, arrays, and nullable fields you might miss.

Why use this tool

  • Interface or type alias output
  • Auto-named nested interfaces
  • Optional properties for null values
  • Union types for mixed arrays
  • Import .json files
  • Unlimited — no daily cap

Questions

What does JSON to TypeScript generate?

TypeScript interfaces or type aliases inferred from the shape of your JSON — strings, numbers, booleans, arrays, and nested objects.

How are nested objects handled?

With Named nested types enabled, each nested object becomes its own interface (e.g. ApiResponseMeta) referenced from the root.

What about null values?

With Optional nulls enabled, properties that are null in the sample become optional (?) in the output.

Can I use this for API responses?

Yes. Paste a sample API JSON response, name the root type, and paste the generated types into your project.

Is my JSON sent to a server?

No. Inference runs entirely in this tab.

Is there a daily limit?

No. This tool has no daily cap.

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