Yes, completely free with no signup required.

Does my data leave my device?

No. All validation happens locally in your browser — nothing is sent to a server.

Does it work on mobile?

Yes. The tool is mobile-first and works on any modern browser.

粘贴 JSON 文档与 JSON Schema,实时验证结构、必填字段与类型。

100% in your browser. Your file never leaves your device.

JSON document

JSON Schema

Paste the JSON document above, the schema below, then click Validate.

Paste your JSON document in the top input.
Paste your JSON Schema in the schema field.
Click "Validate" — errors are listed with the path and message, or you see a "Valid" result.

Is this tool free?: Yes, completely free with no signup required.
Does my data leave my device?: No. All validation happens locally in your browser — nothing is sent to a server.
Does it work on mobile?: Yes. The tool is mobile-first and works on any modern browser.

Last updated: 2026-05-20 By jarvisbox