JSON Schema Toolkit

Validate, generate, and convert JSON Schemas with zero dependencies.

Commands

All commands use scripts/json_schema.py.

Generate Schema from Sample Data

python3 scripts/json_schema.py generate --input sample.json
python3 scripts/json_schema.py generate --input sample.json --output schema.json
echo '{"name":"Jo","age":25}' | python3 scripts/json_schema.py generate --input -

Auto-detects string formats (email, date-time, date, uri, ipv4).

Validate JSON Against Schema

python3 scripts/json_schema.py validate --schema schema.json --data data.json

Reports all validation errors with JSON paths. Exit code 1 on failure.

Convert Schema to Code

python3 scripts/json_schema.py convert --input schema.json --format typescript
python3 scripts/json_schema.py convert --input schema.json --format python-dataclass
python3 scripts/json_schema.py convert --input schema.json --format markdown --name User

Supported formats: typescript, python-dataclass, markdown.

Supported Validation Keywords

type, enum, required, properties, additionalProperties, items, minLength, maxLength, pattern, minimum, maximum, minItems, maxItems, format.

Stdin Support

Use --input - to pipe JSON from stdin for both generate and validate --data.