Broken JSON is one of the most frustrating issues developers face. Whether you're working with APIs, configuration files, or data storage, malformed JSON can bring your application to a halt.
In this beginner-friendly guide, we'll show you how to fix broken JSON online step by step, using our free JSON Fixer tool.
Step 1: Identify the Error
The first step is to understand what error you're seeing. Common JSON errors include:
- Unexpected end of JSON input
- Unexpected token } in JSON
- Expected ',' or } after property value
- Invalid character at position 0
Step 2: Use Our Free JSON Fixer
💡 Quick Fix:
- Open our JSON Fixer tool
- Paste your broken JSON
- Click "Fix JSON" - it automatically detects and repairs errors
- Copy the fixed JSON
Step 3: Common Fixes
Remove Trailing Commas
JSON doesn't allow commas after the last item in objects or arrays.
Add Missing Quotes
All keys and string values must be wrapped in double quotes.
Close All Braces and Brackets
Every opening brace or bracket needs a matching closing one.
Fix Broken JSON Instantly
Our free JSON Fixer automatically detects and fixes all common JSON errors. No signup required.
Advanced JSON Fixer & Recovery Engine
Paste → Instant fix. Repair malformed JSON: trailing commas, missing quotes, broken arrays, AI-generated JSON — 100% client-side
Repair options
Fix from API error
Paste an error like "Unexpected token } in JSON at position 245" to highlight the position.
JSON Input
Fixed JSON Output
JSON Fixer Features
Automatic Error Detection
Scans and identifies all JSON syntax errors automatically
Smart JSON Repair
Fixes common errors like trailing commas, single quotes, and unquoted keys
Precise Error Location
Shows exact line and column numbers for each error
Visual Error Highlighting
Highlights problematic lines with color-coded indicators
Learn More About JSON Fixing
10 Most Common JSON Mistakes Developers Make
Learn about the most common JSON mistakes and how to fix them instantly with examples.
Read Guide →25 Broken JSON Examples and How to Fix Them
Real-world broken JSON examples with step-by-step fixes and explanations.
Read Guide →Why JSON Breaks in Real-World APIs
Understand why APIs return broken JSON in production and how to fix it effectively.
Read Guide →How JSON Fixers Work Internally
Learn how JSON fixers work internally and why manual fixing often fails.
Read Guide →