THE JSON KIT

JSON Lint Online

Advanced JSON syntax checker. Detects errors, highlights line numbers, and suggests fixes. A modern, secure alternative to JSONLint.com.

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Paste JSON to begin diagnostics.

Advanced JSON Linting

What is a Linter?

A linter goes deeper than a standard validator. While a validator typically just says "Invalid", a linter analyzes the code structure to pinpoint the exact location of the error and often suggests how to fix it. It is an essential tool for debugging large configuration files or API payloads.

Common Linting Errors

  • Trailing Commas: [1, 2,] is valid in JS but invalid in JSON.
  • Single Quotes: JSON strictly requires double quotes "key".
  • Undefined: JSON does not support undefined values, only null.

Frequently Asked Questions

What is the difference between linting and validating JSON?▼
Validation only checks whether JSON is syntactically correct and returns a simple pass or fail. Linting goes deeper by explaining why the JSON is invalid, where the issue is located, and how it can be fixed.
Why should I use JSON Lint instead of JSONLint.com?▼
This tool runs 100% client-side for better privacy, supports larger files, provides detailed error explanations with line numbers, offers auto-fix suggestions, and delivers a modern, ad-free experience.
What types of errors can JSON Lint detect?▼
JSON Lint detects missing or extra commas, trailing commas, unquoted keys, invalid characters, comments, unclosed brackets, and other syntax issues that cause parsing failures.
Can JSON Lint automatically fix errors?▼
Yes. For common syntax issues, the linter provides auto-fix suggestions and can apply them to help you correct errors quickly.
How is JSON Lint different from a JSON Parser?▼
A JSON Parser attempts to convert JSON into an object and fails if errors exist. JSON Lint analyzes the JSON first and explains all issues in detail before parsing.
Is this JSON Lint secure for sensitive data?▼
Yes. All linting is performed locally in your browser. No JSON data is uploaded, stored, or transmitted to any server.
Can I lint large JSON files?▼
Yes. The tool is optimized to handle large JSON files efficiently without freezing or crashing the browser.
Can I lint JSON from API responses?▼
Yes. Paste raw JSON responses from APIs to detect syntax issues before using the data in your application.
Does JSON Lint change my data?▼
No. Linting only analyzes the JSON. Your data remains unchanged unless you explicitly apply suggested fixes.
Do I need to install anything to use JSON Lint?▼
No installation is required. JSON Lint works directly in your browser on all modern devices.

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