The generated types are too strict — some fields are optional in practice.

The generator marks a field optional only if it is null or absent in the sample. If your sample happens to include the field, it will be required. Manually add ? to fields that may be absent in other responses.

Should I trust inferred types for production?

Inferred types are a starting point, not a contract. They reflect one sample, not the full API schema. For production, validate against the API's OpenAPI/JSON Schema spec, or use a runtime validator (zod, io-ts) to guard against shape changes.

Generar TypeScript interfaces from JSON data

Infer TypeScript tipos de un JSON sample así que you puede tipo API responses sin hand-writing interfaces.

1

When an API returns untyped JSON, you can infer the shape from a sample response. The generator examines keys, value types, and nesting to produce interfaces that match the observed structure.
2

De JSON a TypeScript →
Paste a JSON sample (ideally a response with all fields populated). The tool outputs TypeScript interfaces with proper types for nested objects, arrays, and scalars.
3

json-format → json-to-ts
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Use the chain to parse JSON, infer types, and emit formatted TypeScript with consistent naming (PascalCase interfaces, camelCase properties).
4

Review the output: optional fields (null or missing in the sample) should be marked with ?. Union types (a field that is sometimes string, sometimes number) need manual adjustment — the generator only sees one sample.

Preguntas frecuentes

The generated types are too strict — some fields are optional in practice.: The generator marks a field optional only if it is null or absent in the sample. If your sample happens to include the field, it will be required. Manually add ? to fields that may be absent in other responses.
Should I trust inferred types for production?: Inferred types are a starting point, not a contract. They reflect one sample, not the full API schema. For production, validate against the API's OpenAPI/JSON Schema spec, or use a runtime validator (zod, io-ts) to guard against shape changes.

Flujos que resuelven esta tarea

Comparar dos configuraciones YAML vía JSON

Convertir configuraciones YAML a JSON para comparación de valores estructurados apta para diff.

Preguntas frecuentes

Flujos que resuelven esta tarea

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