JSON Validator & Linter
Validate JSON syntax with exact error line numbers, parse tree diagnostics, and auto-fix repairs for trailing commas and single quotes.
Valid RFC 8259 JSON
The document has been successfully parsed with zero syntax errors.
object
13 keys
5 levels
0.22 KB
Free Browser-Based JSON Syntax Checker & Linter
Troubleshooting invalid JSON payloads and API responses in local memory
JSON (JavaScript Object Notation) is the universal lingua franca of the modern web, but its strict syntax rules frequently trip up developers. Forgetting to wrap keys in double quotes, leaving a trailing comma after the last array item, or using unescaped control characters will cause `JSON.parse` to crash.
Modifyle's JSON Validator provides instant feedback on document validity without uploading your payload to external servers. If an error is present, you receive an immediate alert indicating the exact offending line and character position.
Once valid, inspect key counts, maximum nesting depth, and overall payload size, or auto-format the payload for immediate readability.
What Can You Use This Tool For?
Real-world problems solved and intended workflows for this tool.
Private Client-Side Data Transformation
Format, inspect, and convert developer payloads with JSON Validator & Linter with zero risk of sending proprietary data to third-party endpoints.
Schema Inspection & Debugging Workflows
Inspect complex data structures, validate syntax, and detect encoding discrepancies during development.
Cross-Platform Payload Normalization
Convert data between formats (JSON, CSV, TypeScript, URLs) for seamless system integration.
How It Works in 3 Simple Steps
Enter JSON Text
Paste your raw payload or upload a .json file directly into the editor.
Inspect Syntax & Diagnostics
Review instant validity status, line and column error indicators, or structural tree metrics.
Auto-Fix or Format
Use the Auto-Fix button to correct common comma and quote errors, or click Prettify to format.
- Processing executes locally in browser memory. Large files depend on available device RAM and CPU capacity.
Why choose Modifyle JSON Validator?
Launch PDF, image, and QR tools in 1 click right from your home screen or desktop dock. 100% private, client-side, with full offline capability without internet.