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Free Online JSON to TypeScript Type Generator

Infer a TypeScript type from a sample JSON object, including nested objects, arrays and nullable values. Sample inference does not define all valid API inputs.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result



How to use JSON to TypeScript Type Generator
Infer a TypeScript type from a sample JSON object, including nested objects, arrays and nullable values. Sample inference does not define all valid API inputs.
  1. Set Text.
  2. Run the tool, review the result and its stated limitations, then copy or download if needed.
Example & practical use
Infer a TypeScript type from a sample JSON object, including nested objects, arrays and nullable values. Sample inference does not define all valid API inputs. The example below demonstrates Text.
Example input:
{
  "text": "{\"name\":\"Ada\",\"age\":37}"
}
Expected result (relevant fields):
"type Root = { \"name\": string; \"age\": number };"
Features & result limitations
Infer a TypeScript type from a sample JSON object, including nested objects, arrays and nullable values. Sample inference does not define all valid API inputs.
Frequently asked questions
What inputs does JSON to TypeScript Type Generator accept?
Text
How should I interpret the JSON to TypeScript Type Generator result?
Infer a TypeScript type from a sample JSON object, including nested objects, arrays and nullable values. Sample inference does not define all valid API inputs.
Where does JSON to TypeScript Type Generator process my data?
Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.