How to Use JSON Linter - Step by Step Guide
Input Your JSON Data
Start by providing your JSON data for linting. Whether you're working with JSON, checking API responses, or ensuring proper syntax, you have three convenient options:
Review Instant Lint Results
The linter automatically analyzes your JSON and provides instant feedback with three severity levels. This goes beyond basic JSON validation to check code quality:
Understand Issue Details
Each issue includes detailed information to help you fix problems quickly. The linter provides structured error messages similar to professional development tools:
Step 4: Fix Issues and Re-lint
Fix the reported issues in your JSON editor. The linter will automatically re-check as you type. For RFC-compliant JSON, you can also use our JSON Fixer to auto-fix common syntax errors, or format your JSON for better readability.
Step 5: Export Lint Report
Save or share your lint results for documentation or team review:
Frequently Asked Questions
What does a JSON linter do?
A JSON linter validates syntax, detects errors, and checks code quality. It goes beyond basic validation to find issues like duplicate keys, empty values, deep nesting, and provides best practice suggestions. It's like a spell checker and style guide combined for your JSON.
What's the difference between errors, warnings, and info?
Errors (red) are critical syntax issues that make JSON invalid and must be fixed.Warnings (orange) are code quality issues that won't break JSON but may cause problems.Info (blue) are suggestions for best practices and performance improvements.
Why does the linter flag duplicate keys?
Duplicate keys in JSON objects are problematic because only the last value is kept - earlier values are silently ignored. This usually indicates a mistake or data modeling issue. The linter helps you catch these before they cause bugs in production.
Can the linter auto-fix issues?
The linter identifies and reports issues but doesn't auto-fix them, as fixing requires understanding your intent. For automatic syntax error repair, use our JSON Fixer tool. The linter is best for code review and quality assurance.
Is the linter free to use?
Yes, completely free with no limitations on file size, usage frequency, or features. No registration required. Lint unlimited JSON files with full error detection, warnings, and best practice suggestions at no cost.