JSON Fixer
Automatically fix and repair broken JSON syntax
What is JSON Fixer?
Got broken JSON? We've all been there – missing quotes, trailing commas, or those pesky unescaped characters that break everything. This tool fixes all that stuff automatically. Just paste your broken JSON (JavaScript Object Notation) and we'll make it valid again.
As MDN Web Docs explains, JSON has strict syntax rules, and our fixer follows the RFC 8259 JSON specification. Great for fixing JSON from APIs that went wrong, database exports, or those times you edited JSON manually and made a typo.
Everything runs in your browser – your data stays on your computer. Fix your JSON in seconds and get back to what you were doing.
How to Use the JSON Fixer
Follow these steps to repair broken JSON. Each step uses the actual buttons and panels on this page.
Paste Broken JSON or Load Sample
Paste your invalid JSON into the left editor. Click Sample JSON to load examples with common errors. Example of broken JSON the fixer handles:
{subscriberId: "SUB-1001", plan: "5G", dataUsage: [45, 60, ]}The fixer repairs missing quotes around keys, trailing commas, unescaped characters, and bracket mismatches per RFC 8259.
Click Fix JSON!!
Click the green Fix JSON!! button in the toolbar. The fixer analyzes your JSON and repairs syntax errors automatically. A loading indicator appears while processing. Both panels use syntax highlighting so you can compare before and after.
Review Fixed Output
The right panel shows the repaired JSON. Data values stay the same – only the structure is fixed. Copy the output for your app or API. Everything runs in your browser; your JSON never leaves your computer.
When You'd Actually Use This
API Debugging
Fix JSON errors from API responses. Quickly repair malformed data from external services or databases without manual editing.
Manual Edits
Fix JSON after manual edits. Common mistakes like missing quotes or trailing commas are automatically corrected.
Data Migration
Repair JSON during data migration. Fix syntax errors that occur when converting data between systems or formats.
Development
Fix JSON during development. Quickly repair test data or configuration files without spending time on syntax errors.
Common Questions
Is my JSON data stored?
Nope. Everything happens right in your browser using JavaScript. Your JSON never leaves your computer – we don't even see it.
What types of errors can it fix?
We fix common JSON syntax errors like missing quotes, trailing commas, unescaped characters, wrong brackets, and structure issues. Some really complex problems might need manual fixing though.
Does it preserve my data?
Absolutely. We only fix the JSON structure per RFC 8259 – all your actual data values stay exactly the same. We're just fixing syntax, not changing your content.
What if the JSON can't be fixed?
If it's really messed up or has complex errors, we'll try to fix what we can. For really severe issues, you might need to manually review and fix some parts yourself.
Can I use it for large JSON files?
Yep. We can handle large files, though really huge ones might take a bit longer. Everything happens in your browser, so it depends on your computer's speed.
Is the fixed JSON always valid?
We try to fix common errors following the RFC 8259 standard, but complex issues might need review. Always validate with our JSON Validator or check against MDN's JSON documentation.
Other JSON Tools You Might Need
Fixing JSON is just one thing you might need. Here are some other tools that work great together: