JSON Schema オンラインバリデーター
JSON データを JSON Schema に対して検証し、詳細なエラーメッセージを即座に確認できます。
What Is JSON Schema Validator?
JSON Schema Validator is a free online tool that checks whether a JSON document conforms to a given JSON Schema. It uses the AJV library to validate your data against schema rules — reporting every constraint violation with a clear path and message, making it ideal for API development, configuration validation, and data quality checks.
How to Use JSON Schema Validator
- Paste your JSON Schema into the left panel, or click Load Sample to try an example.
- Paste the JSON data you want to validate into the right panel.
- Click Validate to run the validation.
- A green result means the data is valid. A red result lists every error with its path.
Features
- Validates JSON data against any JSON Schema (draft-07 and later)
- Reports all errors at once with field paths
- Powered by AJV — the most widely used JSON Schema validator
- Runs entirely in your browser — zero data uploaded
FAQ
What is JSON Schema?
JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. It defines the structure, data types, and constraints that a JSON document must satisfy.
Which JSON Schema versions are supported?
The validator uses AJV which supports JSON Schema draft-07 and later, including draft-2019-09 and draft-2020-12.
Is my data sent to a server?
No. All validation happens entirely in your browser using the AJV library. Your data never leaves your device.