How do I convert JSON to TypeScript?

Paste JSON, select TypeScript and copy the generated interfaces.

Go structs, Java classes and Python dataclass-style output are supported.

Fix syntax errors shown before code generation runs.

Nested JSON becomes nested types with inferred field names.

JSON arrays map to typed lists or slices per target language.

JSON never leaves your browser.

Output reflects keys present in the sample JSON only.

Edit generated names after copy into your codebase.

JSON to Code

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Generate TypeScript, Go, Java or Python types from JSON.

JSON to Code — Generate TypeScript, Go, Java or Python types from JSON. Free, fast and private. Runs entirely in your browser at Quick Calci Tools.

Common scenarios and audiences for this tool.

Bootstrap DTOs from example responses.

Generate Swift/Kotlin alternatives manually from TS preview.

Prototype schema classes quickly.

See how JSON maps to static types.

Create fixture types for contract tests.

Everything you need to know about the JSON to Code.