JSON Validator
Validate JSON syntax and report errors instantly
How It Works
Select Your File
Upload, drag & drop, or paste directly from clipboard.
Configure Options
Set quality level and output format.
Download Result
Processed entirely in your browser. Download instantly.
About JSON Validator
Validate whether a JSON string is syntactically correct and receive precise error messages with line and column numbers if it is not. The validator highlights the exact location of syntax errors in the editor. Supports both strict JSON (RFC 8259) and JSON5 with comments and trailing commas. Useful for debugging configuration files, API payloads, and data imports. The tool also optionally validates JSON against a JSON Schema you provide, giving you type-level validation beyond basic syntax. All validation runs client-side in your browser –sensitive JSON data never leaves your device.
Frequently Asked Questions
Does the validator support JSON5?
Yes. Toggle JSON5 mode to allow comments, trailing commas, and unquoted keys.
Can I validate against a JSON Schema?
Yes. Paste a JSON Schema in the second panel to validate your data structure and types.
Where are errors shown?
Errors appear with line and column numbers, and the relevant line is highlighted in the editor.