What JSON Schema versions does this tool support?

The tool supports Draft 7 (most widely used), Draft 2019-09, and Draft 2020-12. The $schema URI in the output changes accordingly.

How does the tool detect string formats?

String values are analyzed with regex patterns to detect email addresses, URIs, dates (YYYY-MM-DD), ISO 8601 date-times, and UUIDs. Detected formats are added to the schema as "format" keywords.

What happens with null values in my JSON?

Null values generate a type that includes "null" alongside any inferred type, or just "null" if the value is always null. This follows the JSON Schema specification.

Are nested objects and arrays handled recursively?

Yes. The generator recursively processes nested objects and arrays to any depth, generating accurate schemas for complex data structures.

What does "additionalProperties: false" do?

When enabled, the schema will reject any JSON object that contains properties not listed in the schema. This is useful for strict validation.

How are heterogeneous arrays handled?

If an array contains mixed types, the "items" schema will use a union of the detected types. If all items share the same type, a single type schema is generated.

Can I use this schema with popular validators?

Yes. The generated schema is compatible with ajv, Zod (via json-schema-to-zod), Pydantic, and most other JSON Schema validators.

Does the tool detect integer vs number types?

Yes. If a numeric value has no decimal component (e.g., 42), it is typed as "integer". Values like 3.14 are typed as "number".

Is my JSON data sent to any server?

No. All processing happens entirely in your browser using client-side JavaScript. Your data never leaves your device.

What is the pre-loaded example?

The tool loads a sample user object with various field types to demonstrate format detection, nested objects, and array handling.

JSON Schema Generator

Generate JSON Schema from any JSON object with type detection and format inference.

JSON Schema Generator

Generate JSON Schema Draft 7 / 2019-09 / 2020-12 from JSON

Schema version

Input JSONValid

31 lines · 579 chars

Generated Schema

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer"
    },
    "uuid": {
      "type": "string",
      "format": "uuid"
    },
    "username": {
      "type": "string"
    },
    "email": {
      "type": "string",
      "format": "email"
    },
    "website": {
      "type": "string",
      "format": "uri"
    },
    "birthdate": {
      "type": "string",
      "format": "date"
    },
    "createdAt": {
      "type": "string",
      "format": "date-time"
    },
    "isActive": {
      "type": "boolean"
    },
    "score": {
      "type": "number"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "address": {
      "type": "object",
      "properties": {
        "street": {
          "type": "string"
        },
        "city": {
          "type": "string"
        },
        "zip": {
          "type": "string"
        },
        "country": {
          "type": "string"
        }
      },
      "required": [
        "street",
        "city",
        "zip",
        "country"
      ]
    },
    "preferences": {
      "type": "object",
      "properties": {
        "theme": {
          "type": "string"
        },
        "notifications": {
          "type": "boolean"
        },
        "language": {
          "type": "string"
        }
      },
      "required": [
        "theme",
        "notifications",
        "language"
      ]
    },
    "roles": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "lastLogin": {
      "type": "null"
    }
  },
  "required": [
    "id",
    "uuid",
    "username",
    "email",
    "website",
    "birthdate",
    "createdAt",
    "isActive",
    "score",
    "tags",
    "address",
    "preferences",
    "roles"
  ]
}

110 lines · 1843 chars

JSON Schema Generator कसरी प्रयोग गर्ने

1
Paste your JSON object into the input textarea on the left side.
2
The tool validates your JSON in real time and highlights any syntax errors.
3
Choose a schema version: Draft 7, Draft 2019-09, or Draft 2020-12.
4
Toggle options like "Mark all properties required" or "No additional properties" to customize the schema.
5
Enable "Add title/description fields" to include metadata fields in the generated schema.
6
The JSON Schema is generated instantly and displayed in the output panel on the right.
7
Click "Copy Schema" to copy the full JSON Schema to your clipboard.
8
Click "Download .json" to save the schema as a JSON file for use in your project.

JSON Schema Generator बारेमा

Need a JSON Schema for your API or validation pipeline? The JSON Schema Generator automatically creates a complete, standards-compliant schema from any JSON object — with smart type inference, format detection, and support for Draft 7, 2019-09, and 2020-12.

Why Use This Tool?

Writing JSON Schema by hand is tedious and error-prone, especially for deeply nested objects. This tool analyzes your JSON structure recursively, detects string formats (email, URI, date, date-time, UUID), distinguishes integers from numbers, and handles heterogeneous arrays — all in real time as you paste your data.

Key Features

Three Schema Versions: Draft 7 (most widely used), Draft 2019-09, and Draft 2020-12
Smart Format Detection: Emails, URIs, dates, date-times, and UUIDs are automatically tagged
Customizable Output: Toggle required properties, additionalProperties, and title/description fields
Copy & Download: One-click copy or download the schema as a .json file
Syntax Highlighting: Color-coded output for easy reading

Compatible With Popular Validators

The generated schema works with ajv, Zod (via json-schema-to-zod), Pydantic, and all major JSON Schema validators. Use it for OpenAPI specs, form validation, or data pipeline contracts.

All processing happens in your browser — your data never leaves your device.

JSON Schema Generator बारेमा बारम्बार सोधिने प्रश्नहरू

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