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Fix Invalid JSON Online
Find broken JSON syntax, understand the error, and fix the payload in your browser without uploading private data.
Problem
A JSON payload fails because of a trailing comma, missing quote, bad escape sequence, or mismatched bracket.
What to do
Invalid JSON usually blocks API calls, config deployments, and data imports. Start by validating the raw payload, then repair only the exact syntax issue instead of rewriting the document from scratch.
- 1Paste the JSON into the repair workspace.
- 2Read the reported error and line number.
- 3Apply the fix, validate again, then copy the corrected JSON.
Use the browser tool
Fix Broken JSON is a free, browser-based tool that helps you convert between formats. Repair trailing commas, single quotes, comments. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.
People also ask
- How do I use Fix Broken JSON?
- Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Repair trailing commas, single quotes, comments.
- Is my data uploaded or stored anywhere?
- No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.
- Is Fix Broken JSON free?
- Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.