Repair Engine

Magic Auto-Repair Broken JSON

The Magic Auto-Repair engine fixes trailing commas, single quotes, unquoted keys, and Python literals in one click.

100% In-Browser & PrivateNo uploadsFree forever

Every developer has faced the dreaded "Unexpected token" error. MyJSONPal's Magic Auto-Repair engine fixes the most common JSON syntax mistakes automatically, so you spend your time on real work instead of debugging quotes.

The repair engine handles trailing commas, single-quoted strings, unquoted object keys, comments, and Python-style True/False/None literals — transforming messy, dirty text into valid JSON in a single click. Because the entire fix runs locally in your browser, even confidential snippets are repaired in complete privacy.

For everything the engine cannot infer, the strict validator pinpoints the exact line and column of the remaining error so you can finish the job by hand.

Common problems the repair engine solves

// Before — full of common mistakes
{ name: 'Ada', active: True, tags: ['math', 'code',], }

// After — valid JSON
{ "name": "Ada", "active": true, "tags": ["math", "code"] }

How to fix broken JSON

  1. 1Paste your broken or dirty JSON into the input editor.
  2. 2Click Auto-Fix JSON.
  3. 3Review the repairs listed in the status bar (quotes, commas, keys, literals).
  4. 4If any errors remain, the validator highlights their exact position.
  5. 5Copy the repaired JSON or download it as a .json file.

Why MyJSONPal is different

Privacy-first, by design

All parsing, validation and conversion runs in your browser. Your data is never sent, logged, cached or sold — close the tab and it is gone.

Fast, even on huge files

Heavy processing is offloaded to a Web Worker, so multi-megabyte documents are handled without freezing the interface.

No accounts, no limits

There is nothing to sign up for and no usage quota. Paste, format, convert and download as often as you like.

Frequently asked questions

Which errors can Auto-Fix repair?

Trailing commas, single-quoted strings, unquoted keys, line and block comments, and Python True/False/None literals. It also normalizes line endings and removes the UTF-8 BOM.

Can it fix everything?

Not every conceivable error — for example, it cannot guess missing braces. When something is unfixable, the validator points you to the exact line and column that still needs attention.

Will it change the meaning of my data?

Repairs are conservative. The engine only makes changes that are unambiguous (quoting, comma removal, literal casing), and it shows you exactly what it changed.

Is my data private when I fix it?

Fully. Auto-repair runs locally with regex logic in your browser — nothing is uploaded or stored.

More free tools