JSON Fixer: Repair Invalid JSON Online in Your Browser
JSON Fixer tries to repair common mistakes in pasted JSON-like content, including trailing commas, single quotes, unquoted keys, comments, smart quotes, and Python literals such as None, True, and False. It can also remove stray text around the JSON. Adjust the available options, then review a summary of each fix before copying the result.
JSON Fixer is a browser-based tool for trying to repair common JSON mistakes. Use it to clean up input with trailing commas, single quotes, unquoted keys, comments, smart quotes, Python literals, or stray text around the JSON. The tool also shows a summary of every fix applied, so you can review the changes rather than relying only on the final result.
The repair process can remove trailing commas and comments, convert single quotes to double quotes, add quotes around unquoted keys, replace Python literals such as None, True, and False, and replace smart quotes. It can also strip text before or after the JSON. You can adjust the available options before processing; check the tool itself for the settings offered. JSON Fixer tries to handle these common issues, so review the output to confirm it is suitable for your use.
JSON has strict syntax rules: for example, strings and object keys use double quotes, comments are not part of JSON syntax, and values use JSON literals such as true, false, and null. Content written in a looser or Python-like style may therefore need cleanup before a JSON parser can accept it. Converting that input helps when you need to work with data in a JSON-based workflow while preserving a chance to inspect the repairs made.
JSON Fixer runs entirely in your browser. Your input is processed on your device and is not uploaded, stored, or sent to a server; after the page has loaded, the tool also works offline. It is a free option for developers, DevOps engineers, and anyone who needs to repair common JSON formatting mistakes without installing a local tool or sending data to an online service.
Step 1: Paste or drop your JSON content into the input area. You can use content that contains common formatting mistakes the fixer is designed to address.
Step 2: Adjust the available options before starting. The options let you customize the repair process, though their specific settings depend on what is shown in the tool.
Step 3: Run the repair to let JSON Fixer try to correct the input. It may remove trailing commas and comments, convert quotes, quote unquoted keys, replace Python literals, or strip surrounding text.
Step 4: Review the result and the summary of fixes applied. Check the repaired content to make sure it matches what you need.
Step 5: Copy the result for use in your code or another workflow.
Use case: Handle a routine JSON repair task without installing anything locally. Paste the content, review the fixes, and copy the result.
Use case: Clean up JSON while working on a machine where you cannot install developer tools. JSON Fixer runs in the browser, so you can use it from the page.
Use case: Check a snippet that contains common mistakes, such as trailing commas, comments, or unquoted keys. The fix summary helps you see what changed.
Use case: Repair JSON-like text copied from a source that uses single quotes or smart quotes. Review the converted output before using it.
Use case: Turn Python-style literals such as None, True, and False into the corresponding JSON values when they appear in your input.
Use case: Avoid pasting internal data into a third-party service when repairing content. The tool processes input in your browser and does not send it to a server.