JSON Linter & Formatter
JSON Linter & FormatterValidate, format, and beautify your JSON data with detailed error reports and syntax highlighting. Find syntax errors with precise line references and fix them instantly.
About Our JSON Linter
Our JSON Linter is a powerful, free online tool designed to help developers validate, format, and debug their JSON data. Whether you're working with API payloads, configuration files, or any JSON-based content, our linter makes it easy to identify and fix syntax errors, ensuring your JSON is valid and properly formatted.
100% In-Browser Processing
Your data never leaves your device
Key Features
Detailed Error Reporting
Get specific error messages with line and column references to quickly identify and fix JSON syntax issues.
Smart Formatting
Automatically format and beautify your JSON with proper indentation and spacing for improved readability.
File Upload Support
Quickly load and validate JSON files from your local computer with drag-and-drop functionality.
Privacy First
All processing happens directly in your browser - your data never leaves your device, ensuring complete security.
When to Use Our JSON Linter
- Validating API request and response payloads
- Debugging configuration files for web applications
- Cleaning up and formatting JSON data exports
- Teaching and learning proper JSON syntax
- Preparing JSON data for documentation or sharing
Frequently Asked Questions
Tips for Working with JSON
Use Double Quotes
Always use double quotes for property names and string values. Single quotes are not valid in JSON.
No Trailing Commas
Avoid trailing commas after the last item in objects or arrays, as they're not allowed in standard JSON.
Validate Regularly
Validate your JSON whenever you make significant changes, especially when working with complex nested structures.
Use Proper Data Types
Use the appropriate data types for your values: strings in quotes, numbers without quotes, and "true", "false", or "null" for boolean and null values.
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