JSON Validator
Check your JSON for syntax errors and structural validity. Get detailed error messages and line numbers.
Last updated: April 28, 2026
Waiting for input...Tool Settings
Waiting for Input
Paste content to start linting
- Double quotes for keys
- No trailing commas
- Correct nesting of brackets
- Valid primitive types
All processing happens locally in your browser. Large files are handled in memory and never uploaded to any server.
JSON Validator — No Uploads Required
Debug your JSON data with our professional JSON Validator. It performs a deep scan of your JSON structure to ensure it follows the RFC 8259 standard. If an error is found, the validator provides the exact line number and a descriptive message (e.g., 'Missing comma', 'Unterminated string') so you can fix it instantly. It also supports checking for common pitfalls like trailing commas which are invalid in standard JSON.
Why This Tool Exists
What makes this useful — and why I built it this way.
Syntactic Checkups: Detect syntax errors, missing brackets, or bad quotes in JSON.
Detailed Error Flags: Pins precise line numbers where formatting rules are broken.
Interactive Validation: Validates code strings instantly as you write or paste.
When You'd Use This
Real situations where this tool saves the day.
Config Debugging: Troubleshoot why project config files fail to load.
Data Integration Prep: Validate custom JSON feeds before feeding them to databases.
Learning Tool: Clean up nested structures and identify formatting mistakes.
Using JSON Validator
It's straightforward — here's how it works.
Paste the JSON you want to verify into the validator.
Check the 'Status' indicator (Green for Valid, Red for Invalid).
If invalid, look at the error list to see exactly where the problem is.
Fix the errors in the editor and wait for the status to turn green.
Questions People Ask
Honest answers about how this works.
Does it support JSONC (JSON with comments)?
Honestly? Standard JSON does not support comments. Our validator adheres to strict JSON standards, but we provide an option to 'Ignore Comments' if needed for development files.
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