Repair Invalid JSON - Fix Syntax Errors Automatically
Automatically repair and fix broken JSON with intelligent error detection and correction. Remove trailing commas, fix quotes, balance brackets, and convert single quotes to double quotes.
Input (Broken JSON)
Output (Fixed JSON)
Automatic JSON Repairs - Fix These Common Errors
Work smarter with features designed for developers, data analysts, and anyone working with JSON data.
Missing or Incorrect Quotes
Automatically adds missing quotes around keys and values, and converts single quotes to double quotes following JSON standards.
Trailing Commas
Removes trailing commas after the last element in objects and arrays—a common error that breaks JSON parsers.
Comments Removal
Strips out JavaScript-style comments (// and /* */) that aren't allowed in standard JSON format.
Unescaped Characters
Properly escapes special characters like newlines, tabs, and backslashes that need escaping in JSON strings.
Number Format Issues
Fixes invalid number formats including leading zeros, hex numbers, and converts them to valid JSON numbers.
Missing Brackets & Braces
Detects and repairs missing or mismatched brackets [ ], braces , ensuring proper JSON structure.
How to Repair JSON - Quick Guide
Fix broken JSON in three simple steps with our automatic repair tool.
Paste Broken JSON
Copy your malformed or invalid JSON data and paste it into the editor. You can also upload a broken JSON file directly.
Click Repair
Hit the Repair button and let our tool automatically detect and fix syntax errors, missing quotes, trailing commas, and more.
Get Valid JSON
Your repaired JSON appears instantly. Copy it, download as a file, or continue editing. The output is guaranteed valid JSON.
Frequently Asked Questions
What is JSON Repair?
JSON Repair is an automatic tool powered by the battle-tested jsonrepair library. It detects and corrects common syntax errors like missing quotes, trailing commas, unescaped characters, and incorrect brackets—turning invalid JSON into valid, working code.
How does automatic JSON repair work?
Our repair tool analyzes your JSON structure, identifies syntax violations, and applies fixes based on JSON standards. It uses proven algorithms to handle errors intelligently—adding missing quotes, removing trailing commas, escaping characters, and more.
Can it fix all types of JSON errors?
The repair tool fixes 95% of common JSON errors including missing quotes, trailing commas, comments, unescaped characters, number format issues, and bracket mismatches. However, severely corrupted or incomplete JSON may require manual review after automated repair.
What's the difference between Repair and Validate?
Validate only checks if your JSON is correct and shows errors. Repair goes further—it automatically fixes those errors and gives you valid JSON output. Use Repair when your JSON is broken; use Validate to verify already-working JSON."
Will repairing change my data values?
No, the repair tool only fixes syntax and structure—it never alters your actual data values. Numbers stay numbers, strings stay strings, and arrays remain arrays. Only formatting and syntax errors are corrected to make the JSON valid.