JSON Schema Generator Online

Generate a JSON Schema (draft-07) from any sample JSON object instantly. Infers types, required fields, and structure. Free online tool.

JSON Sample

JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "name": {
      "type": "string"
    },
    "age": {
      "type": "integer"
    },
    "active": {
      "type": "boolean"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "address": {
      "type": "object",
      "properties": {
        "city": {
          "type": "string"
        },
        "zip": {
          "type": "string"
        }
      },
      "required": [
        "city",
        "zip"
      ]
    }
  },
  "required": [
    "name",
    "age",
    "active",
    "tags",
    "address"
  ]
}

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What is JSON Schema Generator Online?

JSON Schema validates JSON documents and defines API request/response structure. Generating from a sample object is the fastest way to start documenting an API or configuring runtime validation with libraries like ajv or Zod.

How to Use JSON Schema Generator Online

Paste a sample JSON object.
The inferred JSON Schema is generated instantly.
Refine required fields and add descriptions manually.

Frequently Asked Questions

What is JSON Schema used for?

Validates API bodies, powers OpenAPI/Swagger documentation, enables editor autocomplete for config files, and drives form generation.