JSON Schema Generator
Generate a JSON Schema from sample JSON online for free. Auto-infers types, required fields, and nested structures. No signup.
Runs entirely in your browser — files never uploaded
How to use JSON Schema Generator
- 1. Paste your JSON. Enter or paste a sample JSON object in the left panel. The schema generates automatically as you type.
- 2. Review the schema. The right panel shows the generated JSON Schema with inferred types, required fields, and nested structures.
- 3. Copy the schema. Click the Copy button to copy the generated schema to your clipboard.
FAQ
What JSON Schema version is generated?
The tool generates schemas using the JSON Schema 2020-12 draft specification ($schema: https://json-schema.org/draft/2020-12/schema).
Does it handle nested objects and arrays?
Yes. The generator recursively analyzes your JSON, creating proper schemas for nested objects, arrays, and all primitive types.
How are required fields determined?
Any property with a non-null, non-undefined value is marked as required. Null values are still included in properties but omitted from the required list.
Does it distinguish integers from numbers?
Yes. Whole numbers like 42 are typed as "integer", while decimals like 3.14 are typed as "number".
Is my data uploaded anywhere?
No. Everything runs in your browser. Your JSON is never sent to any server.
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