JSON Cleaner — Online

A **JSON Repair Tool** (or JSON Cleaner) is an advanced utility that automatically detects and fixes structural and syntactical errors in corrupted JSON strings.

While a standard JSON Validator will only *tell* you where an error is, a repair tool actively attempts to fix the data so it can be successfully parsed by `JSON.parse()`.

This is incredibly useful when you are dealing with poorly formatted data scraped from the web, improperly exported database dumps, or JavaScript object literals that were mistakenly saved as JSON files.

Our engine uses heuristic algorithms to guess the intended structure of malformed data. Here is how to use it:

1. **Paste Invalid JSON**: Insert your broken JSON payload into the left editor. 2. **Instant Repair**: The tool instantly processes the text. If the text is severely malformed, it attempts to clean it. 3. **Verify Output**: The fixed, strictly valid JSON is output on the right panel, properly formatted and ready to be used in your application.

The repair engine runs entirely locally in your browser, ensuring high-speed processing without compromising the security of your sensitive data.

The JSON Nova repair engine is trained to automatically fix the most common issues that break JSON parsers:

* **Removes Trailing Commas:** Automatically strips commas found before closing brackets `}` or `]`. * **Fixes Quotes:** Converts single-quoted strings (`'text'`) into standard double-quoted strings (`"text"`). * **Quotes Object Keys:** Wraps unquoted property names in double quotes (e.g., changes `key: "value"` to `"key": "value"`). * **Fixes Escapes:** Corrects common escaping issues inside strings. * **Trims Junk Text:** Can often extract valid JSON embedded within markdown blocks or console logs.