JSON Schema Generator

Generate clean JSON Schema from JSON samples with required fields and format detection.

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JSON sample

Generated schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer"
    },
    "name": {
      "type": "string"
    },
    "email": {
      "type": "string",
      "format": "email"
    },
    "active": {
      "type": "boolean"
    },
    "createdAt": {
      "type": "string",
      "format": "date-time"
    },
    "roles": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "profile": {
      "type": "object",
      "properties": {
        "website": {
          "type": "string",
          "format": "uri"
        },
        "score": {
          "type": "number"
        }
      },
      "required": [
        "website",
        "score"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "id",
    "name",
    "email",
    "active",
    "createdAt",
    "roles",
    "profile"
  ],
  "additionalProperties": false
}

Mark object keys as requiredInclude examplesAllow additional properties

Detects strings, numbers, booleans, arrays, objects, nulls, and mixed arrays.

Adds useful formats for emails, URLs, UUIDs, dates, and date-times.

Runs fully in your browser. Your JSON is never uploaded.

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