FREE · DEVELOPER TOOLS
JSON to TypeScript.
Infer a TypeScript type from a JSON example, including nested objects and arrays.
How to use JSON to TypeScript
Enter or choose the required input, adjust the settings, then generate and review the result. {"name":"Alex"} becomes a type with name: string.
How it works
Infer a TypeScript type from a JSON example, including nested objects and arrays. 200,000 characters; inference is from examples, not a complete schema. Inputs stay on your device. Review the preview or output before using it; refresh the page to clear the current working session.
Example
{"name":"Alex"} becomes a type with name: string.
Questions about JSON to TypeScript
Is JSON to TypeScript free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
200,000 characters; inference is from examples, not a complete schema. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.