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JSONスキーマバリデーター

JSONドキュメントをJSON Schema（Draft 7）に対して検証し、詳細なエラーメッセージを表示します。

よくある質問

コード実装

import json
import jsonschema
from jsonschema import validate, ValidationError

# pip install jsonschema

schema = {
    "type": "object",
    "properties": {
        "name":  { "type": "string", "minLength": 1 },
        "age":   { "type": "integer", "minimum": 0 },
        "email": { "type": "string", "format": "email" }
    },
    "required": ["name", "age"]
}

# Valid data
data = { "name": "Alice", "age": 30, "email": "alice@example.com" }
try:
    validate(instance=data, schema=schema)
    print("Valid!")
except ValidationError as e:
    print(f"Invalid: {e.message}")

# Invalid data
bad_data = { "name": "", "age": -1 }
try:
    validate(instance=bad_data, schema=schema)
except ValidationError as e:
    print(f"Invalid: {e.message}")
    # Invalid: '' is too short

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