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.
What Makes This Tool Different
Automatic Error Detection
We spot all the common mistakes – missing quotes, trailing commas, unescaped characters, and syntax issues. Then we fix them automatically so you don't have to.
Smart Repair
We fix the structure without messing with your actual data. Even handles those crazy nested objects and arrays without losing anything.
Multiple Error Types
Missing quotes? Trailing commas? Wrong brackets? We handle all kinds of errors. If it's a common JSON mistake, we've probably seen it before.
Real-time Preview
See the fixed version right away in the output panel. Compare before and after to make sure we got everything right.
Syntax Highlighting
Both panels get nice syntax highlighting so you can easily spot what changed and verify everything looks good.
Privacy First
All the fixing happens right in your browser. Your JSON never leaves your computer, so your data stays private.
How It Works
Paste Invalid JSON
Drop your broken JSON into the left editor. Not sure what broken JSON looks like? Hit "Sample JSON" to see some examples with common errors.
Click Fix JSON
Click the "Fix JSON!!" button. We analyze your JSON and automatically repair syntax errors, missing quotes, trailing commas, and more.
Review Fixed JSON
Review the fixed JSON in the right panel. The output is valid JSON ready to use in your application or API.
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. Your JSON never leaves your computer – we don't even see it.
What types of errors can it fix?
We fix common JSON errors like missing quotes, trailing commas, unescaped characters, wrong brackets, and syntax issues. Some really complex structural problems might need manual fixing though.
Does it preserve my data?
Absolutely. We only fix the structure – 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, but really complex issues might need manual review. Always check the output with our JSON Validator to make sure it's valid.
Other JSON Tools You Might Need
Fixing JSON is just one thing you might need. Here are some other tools that work great together:
Need to learn more about JSON? Check out the official JSON.org website or the comprehensive guide on MDN.