JSON to TypeScript Converter
Paste a JSON sample and generate a TypeScript interface or type. Everything runs offline in your browser – your data never leaves the device.
All processing happens locally in your browser. No data is sent to a server.
The JSON to TypeScript Converter takes a raw JSON sample and instantly produces a TypeScript interface or type definition. It runs entirely in your browser, so nothing is uploaded and the conversion works even when you are offline.
Use it whenever you receive a payload from an API, need quick typings for a mock response, or want to bootstrap a new project without hand‑writing interfaces. Paste the JSON, pick the desired output style, and click Convert – the result appears in the right pane ready to copy.
The tool does not validate your JSON against a schema, resolve circular references, or generate runtime validation code. It simply maps the structure you provide into static TypeScript types. If your JSON is malformed, the converter will show an error and ask you to fix it.
How to Use JSON to TypeScript Converter
- Paste JSON — Copy your JSON payload into the left‑hand editor.
- Select output style — Choose "interface" or "type" from the dropdown menu.
- Convert — Click the Convert button to generate the TypeScript definition.
- Copy result — Use the copy icon or select the code to paste it into your project.
Frequently Asked Questions
Can I use the tool without an internet connection?
Yes. All processing happens locally in your browser, so after the page loads you can generate typings offline with no network requests. Everything executes locally in your browser with zero server uploads, keeping all your json to typescript generator workflows fast, dependable, and completely private.
Does the generator handle nested objects and arrays?
It recursively walks the JSON structure, creating matching nested interfaces or type literals, including arrays of objects, to reflect the original hierarchy. Everything executes locally in your browser with zero server uploads, keeping all your json to typescript generator workflows fast, dependable, and completely private.
Will optional fields be marked correctly?
Fields that are missing in some objects are automatically marked as optional using the ? syntax in the generated TypeScript. Everything executes locally in your browser with zero server uploads, keeping all your json to typescript generator workflows fast, dependable, and completely private.
Can I change the name of the generated interface?
You can edit the default name directly in the output pane before copying; the tool does not rename fields automatically. Everything executes locally in your browser with zero server uploads, keeping all your json to typescript generator workflows fast, dependable, and completely private.
Is my data sent to a server?
No. The conversion runs entirely in your browser, so nothing is uploaded or stored on any server. Everything executes locally in your browser with zero server uploads, keeping all your json to typescript generator workflows fast, dependable, and completely private.