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How to Fix JSON Errors - Step by Step Guide

Step 1

Input Your Broken JSON

Got broken JSON that's causing parse errors? Let's fix it! After fixing, use our JSON validator, formatter, or learn about JSON. Paste your problematic JSON data:

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Paste broken JSON: Copy error-prone JSON from your API responses, config files, or databases

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Fix common errors: Automatically repairs comma errors, bracket errors, quote issues, and other syntax problems

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Try sample JSON: Click "Sample" to load valid JSON and see the tool in action

Note: For very large JSON files, the server may not be able to handle the processing due to the complex algorithm required for error detection and fixing. Please use smaller JSON chunks for best results.

Example: Common JSON Errors

Here are typical JSON syntax errors that break parsing:

{
  "name": "Sarah Chen",
  "email": "[email protected]",
  "age": 28,
  "skills": ["JavaScript", "Python", "React",], 
  "active": true,
  "projects": {
    "current": "Website Redesign"
    "completed": "Mobile App" 
  }
  "department": 'Engineering' 
}

Step 2

Review Error Detection

The tool automatically scans your JSON and identifies all syntax errors with precise locations and descriptions:

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Error highlighting: See exactly where each syntax error occurs in your JSON

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Detailed descriptions: Get clear explanations of what's wrong and why it breaks parsing

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Line numbers: Pinpoint exact locations of errors for easy identification

Most Common JSON Errors and How to Fix Them

1. Trailing Commas

JSON doesn't allow trailing commas after the last item in an array or object. This is one of the most frequent errors.

❌ Wrong: ["item1", "item2",]

✅ Correct: ["item1", "item2"]

2. Single Quotes Instead of Double Quotes

JSON requires double quotes for strings. Single quotes will cause parsing errors.

❌ Wrong: {'name': 'Sarah'}

✅ Correct: {"name": "Sarah"}

3. Missing Commas Between Properties

Every property in an object must be separated by a comma, except the last one.

❌ Wrong: {"name": "Sarah" "age": 28}

✅ Correct: {"name": "Sarah", "age": 28}

4. Unquoted Property Names

All object keys must be enclosed in double quotes in valid JSON.

❌ Wrong: {name: "Sarah"}

✅ Correct: {"name": "Sarah"}

Step 3

Apply Fixes and Validate

Use the auto-fix feature or manually correct errors, then validate your fixed JSON:

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Auto-fix: Automatically correct common errors like trailing commas and missing quotes

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Manual editing: Make custom corrections with real-time error checking

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Validation: Confirm your JSON is now valid and ready to use

Best Practices for Working with JSON

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Always Validate Before Deployment:

Run your JSON through a validator before using it in production to catch syntax errors early.

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Use a JSON Linter in Your IDE:

Modern code editors like VS Code have built-in JSON validation that highlights errors as you type.

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Keep JSON Simple and Readable:

Use proper indentation and formatting to make your JSON easy to read and maintain.

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Test with Different Parsers:

Different systems may have slightly different JSON parsing requirements. Test across platforms.

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Document Your JSON Schema:

Maintain documentation of your JSON structure to help team members understand the data format.

Example: Before and After JSON Fixing

Here's how the JSON fixer transforms broken JSON into valid, properly formatted data:

❌ Broken JSON (Before)

{
  "user": "Sarah Chen",
  "email": "[email protected]",
  "age": 30,
  "skills": ["React", "Node.js",], // Error: trailing comma
  "active": true,
  "profile": {
    "bio": "Developer"
    "location": "NYC" // Error: missing comma
  }
  "role": 'admin' // Error: single quotes
}

✅ Fixed JSON (After)

{
  "user": "Sarah Chen",
  "email": "[email protected]",
  "age": 30,
  "skills": ["React", "Node.js"], // Fixed: trailing comma removed
  "active": true,
  "profile": {
    "bio": "Developer",
    "location": "NYC" // Fixed: comma added
  },
  "role": "admin" // Fixed: double quotes used
}

✅ Result: The JSON is now valid and can be parsed by any JSON parser without errors. All syntax issues have been resolved while preserving the original data structure and values.

Frequently Asked Questions

What JSON errors can the fixer repair automatically?

The fixer handles common issues like missing commas, trailing commas, unquoted property names, single quotes instead of double quotes, and unmatched brackets. It provides smart suggestions for complex syntax errors.

Is it safe to use the auto-fix feature?

Yes! The fixer only makes safe corrections that don't change data meaning. It shows you exactly what will be fixed before applying changes, so you can review and approve modifications to your JSON.

Can the fixer handle complex nested JSON errors?

Absolutely! The fixer analyzes deeply nested structures and identifies errors at any level. It provides precise line numbers and context for each issue, making it easy to fix complex JSON files.

What if my JSON has multiple syntax errors?

The fixer identifies and lists all syntax errors in order of priority. You can fix them one by one or use the batch fix feature to correct multiple issues simultaneously with detailed change previews.

Does the fixer work with large JSON files?

Yes! The fixer efficiently processes large JSON files and provides fast error detection and correction. It handles files with thousands of lines while maintaining accuracy and performance. Once fixed, you can format the JSON or convert it to a table for analysis.

How do I fix JSON parse errors from API responses automatically?

Paste your broken API response JSON into the fixer. It automatically detects and repairs common API errors like trailing commas in arrays, unescaped quotes in strings, missing brackets, and malformed nested objects. Perfect for debugging REST API responses, GraphQL errors, and microservice JSON payloads.

Can I fix malformed JSON from database exports with missing commas?

Yes! The fixer specializes in repairing database export JSON with common issues like missing commas between properties, unquoted keys, and inconsistent formatting. It intelligently identifies where commas should be and fixes structure errors while preserving your data values perfectly for import into other systems.

How to repair JSON with single quotes instead of double quotes online?

The auto-fix feature automatically converts all single quotes to valid double quotes in property names and string values. This is one of the most common JSON syntax errors from JavaScript code. The fixer handles thousands of quote replacements instantly while maintaining string content integrity.

What's the best online tool to validate and fix broken JSON from config files?

This JSON fixer validates and repairs configuration file errors including unquoted property names, trailing commas, bracket mismatches, and encoding issues. It shows exact line numbers and error descriptions, making it ideal for fixing package.json, tsconfig.json, app config files, and settings files before deployment.

JSON Fixer - Fix JSON Parse Errors and Syntax Issues Online