JSON Schema Generator — Draft-7 Output Tool
Paste any JSON object and instantly generate a JSON Schema Draft-7 document. Infers types for strings, numbers, integers, booleans, null, nested objects, and arrays. Marks non-null fields as required and sets additionalProperties to false. Free and runs entirely in your browser.
How to Use JSON Schema Generator — Draft-7 Output Tool
How to Use the JSON Schema Generator
Step 1: Paste Your JSON
Paste any valid JSON object into the input field. The tool accepts objects, arrays, nested structures, and all JSON primitive types.
Step 2: Choose Options
Mark non-null fields as required — when checked, all properties whose values are not null in the sample input are added to the schema's required array. Uncheck to generate a schema with no required fields.
Step 3: Copy the Schema
The JSON Schema Draft-7 output updates instantly. Click Copy Schema to copy the full schema to your clipboard.
Type Inference Rules
string— any JSON string valueinteger— numbers with no fractional part (1, 42, 0)number— numbers with a fractional part (1.5, 3.14)boolean— true or falsenull— null valuesobject— nested JSON objects (recursively inferred with properties, required, and additionalProperties: false)array— JSON arrays; item type is inferred from all elements (anyOf if mixed types)
Use Cases
- Generate a schema for an API response payload to use in request validation
- Create a base schema for a JSON config file
- Understand the shape of an unfamiliar JSON document
- Bootstrap OpenAPI schema components from example responses
- Use as a starting point for more detailed hand-authored schemas
Tips
- Use a real example from your API — the more representative the data, the more accurate the schema
- For arrays with mixed types, the generator outputs anyOf covering all observed item types
- The generated schema uses additionalProperties: false on all objects — remove this if your objects allow extra keys
- null values in the sample produce type: null — update to anyOf: [{type: "string"}, {type: "null"}] if the field is nullable
Frequently Asked Questions
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