JSON Repair

Online tool for attempting to fix typical JSON errors: trailing commas, single quotes, comments, and unquoted keys.

Обработка выполняется локально в браузере. Данные не отправляются на сервер.

For this tool, processing runs locally in your browser and data is not sent to the server.

JSON Repair is a free online tool for fixing typical JSON syntax errors from logs, webhooks, exports, and configs. Processing runs locally in your browser and data is not sent to the server.

What it does

Output

Processing

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How to use

Paste broken JSON from a log, webhook, export, config, or API response.
Choose repair mode: safe repair, extended repair, or trailing comma only.
Check status, list of applied fixes, and resulting valid JSON.
Copy the result and additionally validate it with JSON Validator before production use.

More about this tool

JSON Repair helps fix typical syntax errors in JSON from logs, webhooks, bad exports, configs, and API responses.

The tool can remove trailing commas, strip BOM, remove comments, replace simple single quotes, and add quotes around simple keys. After repair the service validates the result through JSON.parse and shows whether valid JSON was obtained. In complex cases, verify the result manually to avoid distorting the payload.

Processing runs locally in your browser.

Fixes typical JSON errors
Removes trailing commas
Can remove comments and BOM
Shows list of applied fixes
Validates result through JSON.parse
Useful for logs, webhooks, exports, and configs
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What does JSON repair do?

The tool attempts to fix typical JSON syntax errors and then checks whether the result became valid.

Which errors can be fixed automatically?

The service can remove trailing commas, BOM, simple comments, and in extended mode cautiously replace single quotes and add quotes around simple keys.

What is a trailing comma?

A trailing comma is an extra comma after the last element in an object or array, e.g. {"a":1,}. Trailing commas are forbidden in strict JSON.

Can JSON with comments be fixed?

Comments are forbidden in strict JSON. In extended mode the tool may remove simple // and /* */ comments if they are not inside string values.

Does repair guarantee a correct result?

No. The tool fixes only typical syntax errors. In complex cases it may not understand the original meaning, so verify manually.

How is JSON repair different from JSON validator?

JSON validator only shows whether JSON is valid and where the error is. JSON repair tries to fix some typical errors and then validates.

How is JSON repair different from JSON formatter?

JSON formatter prettifies already valid JSON. JSON repair first tries to fix invalid JSON and may then format the result.

Can I use the result in production?

Only after manual verification. JSON repair should not automatically be treated as the source of truth for production payloads.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.

More about this tool

JSON Repair helps fix typical syntax errors in JSON from logs, webhooks, bad exports, configs, and API responses.

Processing runs locally in your browser.

Fixes typical JSON errors
Removes trailing commas
Can remove comments and BOM
Shows list of applied fixes
Validates result through JSON.parse
Useful for logs, webhooks, exports, and configs
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What does JSON repair do?

The tool attempts to fix typical JSON syntax errors and then checks whether the result became valid.

Which errors can be fixed automatically?

The service can remove trailing commas, BOM, simple comments, and in extended mode cautiously replace single quotes and add quotes around simple keys.

What is a trailing comma?

A trailing comma is an extra comma after the last element in an object or array, e.g. {"a":1,}. Trailing commas are forbidden in strict JSON.

Can JSON with comments be fixed?

Comments are forbidden in strict JSON. In extended mode the tool may remove simple // and /* */ comments if they are not inside string values.

Does repair guarantee a correct result?

No. The tool fixes only typical syntax errors. In complex cases it may not understand the original meaning, so verify manually.

How is JSON repair different from JSON validator?

JSON validator only shows whether JSON is valid and where the error is. JSON repair tries to fix some typical errors and then validates.

How is JSON repair different from JSON formatter?

JSON formatter prettifies already valid JSON. JSON repair first tries to fix invalid JSON and may then format the result.

Can I use the result in production?

Only after manual verification. JSON repair should not automatically be treated as the source of truth for production payloads.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.