v2.8 — 31 patterns handled

Fix broken JSON
in one paste

Paste any malformed JSON from your pipeline, API, or database. Get clean, syntax-highlighted output instantly. Zero setup, works offline.

Open JSON Cleaner → Chrome Extension
Before & After — real pipeline output
Input DIRTY
→
Output CLEAN

Every broken pattern. Fixed.

Built from real pipeline failures by a data product manager who got tired of manual fixes.

❝
Double-quoted keys
Fixes ""key"": "value" from Word, Excel, and database copy-paste artifacts.
🧱
Missing brackets
Inserts or removes mismatched { } [ ] inferred from structure.
📦
Stringified JSON
Recursively expands fields whose values are JSON strings. Six bracket-mismatch variants.
💻
Windows file paths
Correctly escapes C:\Users\Alice backslashes that break JSON parsers.
⚛
JS / Python values
Converts undefined, NaN, True, None, function(){}, and comments to valid JSON.
🔧
Inner quotes, escapes & commas
Escapes unescaped inner quotes like "John "Danger" Doe", fixes \x hex escapes, literal newlines, double commas, trailing commas, single quotes.

Ready to clean your JSON?

Works entirely in your browser. Nothing is sent to any server. Open it, paste, done.

Open JSON Cleaner Pro →