JSON Fixer

What is JSON Fixer

Last reviewed: April 18, 2026

JSON (JavaScript Object Notation) is a lightweight, human-readable data format used almost everywhere on the web for APIs, config files, and log output.

JSON Fixer runs a series of pragmatic rewrites over your input — stripping comments, removing trailing commas, converting single quotes to double quotes, and quoting bare object keys — before running JSON.parse to confirm the result is valid.

It's the fastest way to turn hand-edited JSON, JavaScript object literals, or JSONC configs into strict, spec-compliant JSON without hunting down errors character-by-character.

Why use it

• Repair hand-edited config files in seconds.
• Convert JavaScript-style object literals into strict JSON.
• Strip // and /* */ comments from JSONC documents.
• Clean up clipboard JSON pasted from chat or logs.
• Pre-process fixtures for parsers that don't tolerate JSON5 features.

Features

• Strips // and /* */ comments
• Removes trailing commas
• Quotes bare keys and single-quoted strings
• Validates with JSON.parse
• Local-only JSON Fixer processing keeps data in-browser

How to use JSON Fixer

1. Paste broken JSON. Drop JSONC, JSON5, or hand-edited JSON into the input.
2. Click Fix. The tool rewrites common issues and parses the result.
3. Copy strict JSON. Use the cleaned output in your service or config.

Example (before/after)

{
  // user record
  name: 'Ada',
  tags: ['admin', 'ops',],
}

{
  "name": "Ada",
  "tags": [
    "admin",
    "ops"
  ]
}

Common errors

FAQ

Related tools

Pair JSON Fixer with the validator, sorter, and cleaner for a robust JSON repair pipeline. You can also browse the full Formatters & Beautifiers category for more options.