jsonpost
Formatting & Validation

JSON Fixer / Repair Tool

Automatically fix trailing commas, single quotes, unquoted keys, and other common JSON errors in one click.

Runs entirely in your browser — your data never leaves your device.

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How to use this tool

  1. 1Paste your broken or JavaScript-style JSON into the editor.
  2. 2The tool repairs common issues automatically.
  3. 3Copy the valid, standards-compliant JSON output.

Frequently asked questions

What kinds of errors can it fix?
Trailing commas, single quotes, unquoted object keys, comments, missing commas, and Python/JavaScript literals like True, False, None, and undefined.
What if it can't fix my JSON?
If the structure is too ambiguous to repair safely, the tool reports the error so you can fix it manually using the Validator.
Is my data uploaded to a server?
No. Every tool on JSONPost runs entirely in your browser using JavaScript. Your JSON never leaves your device, so it is safe to use with private or sensitive data.

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