JSON to TypeScript

Paste JSON and generate TypeScript interfaces for the matching object shape.

JSON Input

TypeScript Output

JSON to TypeScript interface

Paste a JSON object and get TypeScript interfaces from it. This is useful when you have an API response and want types for your frontend code.

Why convert JSON to TypeScript?

TypeScript types make API data easier to work with. Your editor can suggest field names, and TypeScript can catch mismatched shapes before the code runs.

Create types from API JSON
Document response shapes in code
Catch simple data mistakes earlier
Speed up frontend work with autocomplete

How to use it

Paste valid JSON in the left box. The TypeScript interface appears on the right. You can format the JSON first, then copy the generated code.

Start with representative sample data. Optional fields and mixed arrays may need a manual pass after generation.

How to use JSON to TypeScript

Use this tool when you have a JSON response and want a quick TypeScript shape for it. It is useful for API work, mock data, and small front-end projects where you do not want to write interfaces by hand.

Developers often use this page when they need json to typescript converter, json to typescript interface, json to typescript type, and json to typescript class.

Privacy and data handling

This tool is designed to run in your browser for normal use, so your input does not need to be sent to a server.

Input and output stay on the page while you work.
Copy buttons use your browser clipboard permission when available.
Avoid pasting private production data on shared or untrusted devices.

Examples

Create an interface from JSON

Input

{"id":123,"name":"Ada","active":true}

Output

interface Root {
  id: number;
  name: string;
  active: boolean;
}

Use a sample with realistic fields so the generated TypeScript is close to your API response.

Steps

1Paste a JSON object or array into the input box.
2Check the generated TypeScript interface names and field types.
3Copy the result into your project and rename fields if your code style needs it.

Common use cases

Create types from a sample REST API response.
Document the shape of mock data before building a UI.
Turn small JSON examples into safer TypeScript code.

Practical tips

Use a realistic JSON sample. One tiny object may not show every optional field.
Review arrays and null values because generated types may need manual cleanup.
Keep generated interfaces close to the API layer so later changes are easier to track.

FAQ

Can JSON be converted to TypeScript automatically?

Yes. A sample JSON value can be inspected and mapped to TypeScript interfaces. You should still review the output for optional fields, null values, and naming style.

Does this tool upload my JSON?

No. The conversion runs in your browser, so it is safe for normal development samples. Avoid pasting production secrets into any online tool.