Generador de JSON Schema
Genera JSON Schema a partir de datos JSON de ejemplo
Entrada JSON
Salida JSON Schema
Build a JSON Schema from a real payload
Writing JSON Schema by hand is slow and easy to get wrong. Generating one from a sample document gives you a solid starting point — types inferred from values, required fields detected from presence, and nested objects expanded — that you can tighten with enums, formats, and constraints before shipping.
Use the generator when you need to
Bootstrap a contract for a new API
Take a sample response and generate a Draft 2020-12 schema you can refine with proper validation rules.
Validate AI structured output
Lift the schema from a known-good model response so downstream validation has something concrete to enforce.
Document the shape of a payload
Use the generated schema as living documentation of what your service produces or expects.
How to generate a JSON Schema
- 1
Paste a representative sample JSON document.
- 2
Click Generate to produce a Draft 2020-12 schema with inferred types and required fields.
- 3
Refine the schema with enums, patterns, and explicit required arrays before adopting it.
Keep going
Validate against the generated schema
Check real payloads against the schema you just generated.
Wrap for OpenAI or Anthropic
Adapt the schema for OpenAI Structured Outputs, Anthropic tools, or MCP definitions.
Generate TypeScript types
Pair runtime validation with compile-time types from the same sample.
Generate matching mock data
Produce fake records that satisfy the schema for tests and prototypes.
Common schema-generation workflows
Generate the schema once, commit it to source control, and reject deviations in CI.
Use the generated schema to enforce that model output matches what your handler expects.
Quickly produce schemas for existing payloads and start enforcing them in stages.
Herramientas relacionadas
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Validador JSON Schema
Valida documentos JSON contra un JSON Schema
Anthropic Tool Input Builder
Build Claude tool definitions with `input_schema` from sample JSON input
JSON a TypeScript
Genera interfaces y tipos TypeScript a partir de JSON
Preguntas frecuentes
JSON Schema es un vocabulario para describir la estructura de datos JSON y sus reglas de validación. Define qué propiedades se permiten, sus tipos, campos obligatorios y restricciones como mínimos/máximos o patrones de string.
Pega un documento JSON de ejemplo y haz clic en Generate. La herramienta inspecciona la estructura y los tipos para producir un borrador de JSON Schema que valida documentos con la misma forma que tu muestra.
La herramienta genera esquemas compatibles con JSON Schema Draft 2020-12 (el borrador más reciente), soportado por la mayoría de librerías de validación, incluidas Ajv, jsonschema y everit-json-schema.
Sí. Puedes usar el esquema directamente con librerías de validación en cualquier lenguaje, integrarlo en definiciones OpenAPI/Swagger o emplearlo en herramientas de validación de formularios para asegurar que los datos entrantes cumplen la estructura esperada.