JSON Schema Generator

Auto-generate a JSON Schema from a sample object. Type inference detects integers, numbers, strings, booleans, arrays and nested objects, and marks all keys as required. 100% Local

How to Use the JSON Schema Generator

Paste a representative sample JSON object into the input box. Click Generate Schema and the output panel shows a complete JSON Schema with the $schema field set to the 2020-12 draft, inferred types and a required array.

Type inference rules

• Integers map to "integer"
• Floats map to "number"
• Objects map to "object" with nested properties
• Arrays map to "array" with items inferred from the first element
• Strings, booleans and null are preserved

Features

• Auto-detects all JSON primitive types
• Recursively builds schemas for nested objects
• Populates the required array from observed keys
• Uses the JSON Schema 2020-12 draft
• All processing runs locally in your browser. Your data is not uploaded to any server.

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