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JSON to TypeScript Interface Generator

Generate readable TypeScript interfaces from JSON objects and arrays with nested type detection.

Free to use Your content is processed on this device and is not uploaded to Lucaden.

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How it works

Complete the job in three clear steps

  1. Add a representative JSON value to the private browser workspace.
  2. Choose the available settings and create TypeScript interfaces and type declarations.
  3. Review the result, then copy or download it before leaving the page.

Important

Check the result before relying on it

Review generated output before using it in production. Formatters and converters can validate structure, but they cannot understand every application-specific rule or guarantee that transformed content has the intended meaning.

Practical details

What this Lucaden tool does

The generator infers primitives, arrays, nested objects, nullable values, and mixed collections from the supplied sample. Generated names are sanitized into valid PascalCase identifiers and repeated object shapes are emitted as separate interfaces.

Lucaden performs this task in the browser so the source stays under your control. The result is created only after you request it, and nothing is saved to a Lucaden account by this tool.

Included capabilities

  • Nested interface generation
  • Array and nullable type inference
  • Configurable root type name
  • Valid identifier cleanup

Useful for

  • Type API response samples
  • Bootstrap frontend models
  • Document webhook payloads
  • Create test fixture types

Questions

About this tool

Is generated typing guaranteed to match every API response?

No. It reflects only the sample you provide. Optional or conditionally shaped fields require review and adjustment.

What happens with mixed arrays?

The generator creates a union of the value types found in the sample array.

Keep going

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Open-source foundations

Built transparently

Lucaden documents its standards sources, architectural references, and permissive runtime dependencies while keeping this workspace consistent with the Lucaden interface.

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