1. Paste Your JSON
Enter or paste your JSON data into the input textarea on the left.
JSON Validator
Output
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Tools:
JSON Validator
JSON Validator
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Input
Output
JSON Validator is a free browser-based developer utility by ToolPix. All formatting, validation, and encoding tasks run 100% locally in client-side memory via JavaScript and WebAssembly — your source code, tokens, and data are never uploaded or stored on any server.
Quick Steps
2. Click Validate
Click the Validate button to check for syntax errors in your JSON.
3. Review Results
The output panel shows a success message or the first error with line and column info.
FAQ
What JSON syntax errors does this validator detect?
The validator catches missing commas, trailing commas, unquoted keys, mismatched brackets and braces, invalid string escapes, invalid numbers, and any other JSON syntax violation.
Is my JSON data uploaded to a server?
No. All validation happens locally in your browser. Your JSON data never leaves your device, ensuring 100% privacy.
What does the error message show?
When invalid JSON is detected, the tool shows the exact error type along with the line number and column position so you can quickly locate and fix the problem.
Does this tool support JSON5 or JSONC?
No, this validator checks strict standard JSON only. It does not support comments, trailing commas, or unquoted keys that JSON5 or JSONC allow.
Is this JSON lint tool free?
Yes, this JSON validator is completely free to use with no sign-up required. Validate as many JSON files as you need.
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