JSON Validator
Check whether your JSON is syntactically valid. Errors are reported with line and column numbers so you can fix them quickly. Works with objects, arrays, and deeply nested structures.
Runs locally in your browser
For large JSON, open fullscreen to inspect it comfortably
Paste JSON above to validate it.
JSON to validate
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About JSON Validator
Check whether your JSON is syntactically valid. Errors are reported with line and column numbers so you can fix them quickly. Works with objects, arrays, and deeply nested structures.
JSON Validator is part of FizzKit — a collection of focused, browser-based tools. Because everything runs locally, it works offline once loaded and never exposes your data to a remote server.
Frequently asked questions
No. It checks syntax only. For schema validation (JSON Schema, etc.) you will need a dedicated schema validator.