JTA
JSON Error Fixer

Fix Invalid JSON Online

Broken JSON can break your entire application, API, or configuration file. Our Fix Invalid JSON tool helps you instantly detect and repair common JSON errors such as missing commas, unclosed brackets, invalid quotes, and formatting issues — directly in your browser.

No installations. No sign-up. Just paste your JSON and fix it.

100%
Free Forever
Instant
Error Fix
Private
& Secure

Example: Before & After

See how we fix common JSON errors automatically

Invalid JSON 

{
  "name": "John"
  "age": 30,
}
⚠️Missing comma after "John"
⚠️Trailing comma after 30

Fixed JSON 

{
  "name": "John",
  "age": 30
}
✅Valid JSON – Ready to use!

What is Invalid JSON?

Invalid JSON is any JSON data that does not follow proper syntax rules defined by the JSON specification. Even a single character mistake can cause JSON parsing to fail.

Common causes include:

•Missing commas between fields
•Unclosed { } or []
•Incorrect quotes (' instead of ")
•Trailing commas
•Improper nesting

Common JSON Errors We Fix

Our tool automatically detects and repairs these frequent JSON syntax issues

❌

Unexpected token errors

Missing or extra characters that break JSON parsing

❌

Missing or extra commas

Commas between object properties or array items

❌

Unmatched braces or brackets

Unclosed {} or [] symbols

❌

Invalid string quotes

Single quotes instead of double quotes

❌

Trailing commas

Extra comma at the end of objects or arrays

❌

Improper indentation & formatting

Messy formatting that makes JSON hard to read

How to Fix Invalid JSON

1

Paste JSON

Copy your invalid JSON into the editor

2

Click Fix

Press the Fix JSON button

3

Get Valid JSON

Instantly receive corrected JSON

4

Copy & Use

Download or copy the fixed output

Why Use This JSON Fixer?

Instantly Detects Errors

Quickly identifies syntax errors and shows exactly where the problem is, saving you hours of manual debugging.

Auto-Fixes Common Issues

Automatically repairs missing commas, quotes, brackets, and other syntax problems with intelligent detection.

Client-Side Processing

All processing happens in your browser. Your data never leaves your device, ensuring complete privacy and security.

Works for Everything

Perfect for APIs, configuration files, database exports, and any JSON data source you're working with.

When Should You Use This Tool?

Use this tool when:

JSON.parse() Errors

Your app throws parsing errors and you need to find the issue quickly

API Response Failures

API responses fail to load due to malformed JSON data

Config File Issues

Configuration files don't work and need syntax correction

Validation Errors

JSON validators show errors but you can't find the exact problem

Copied JSON Data

You copy JSON from logs, emails, or documentation and it's broken

Frequently Asked Questions

What does "invalid JSON" mean?

Invalid JSON means the data does not follow strict JSON syntax rules, such as missing commas, unmatched brackets, trailing commas, or incorrect use of quotes. Even a small mistake can break JSON parsing.

How do I fix invalid JSON?

You can fix invalid JSON by using a JSON fixer tool that detects syntax errors and automatically corrects common issues like missing commas, invalid quotes, or unclosed braces.

Can this tool automatically fix JSON errors?

Yes. The Fix Invalid JSON tool automatically repairs common syntax mistakes and converts broken JSON into valid, readable JSON whenever possible.

Is my JSON data safe when using this tool?

Yes. All JSON validation and fixing happens directly in your browser. Your data is never uploaded or stored on any server.