Support

The last document you edited and your settings are kept only in this browser’s extension storage. Nothing is sent to us, and we can’t see it. To keep a file, download it with Save › Save to disk. See the Privacy Policy for details.

This menu (and Ctrl+S) is left over from the original project, and we don’t run a server for it — so the document isn’t saved and you see an error. We plan to remove the menu in the next update. To keep your work as a file, use Save › Save to disk.

Choose it with Open › Open from disk, or drag the file onto the editor. The file is read only inside your browser.

Please check the following:

• In Chrome, the first time you open a site the extension asks for permission. If you declined, nothing is loaded — try again and click Allow.
• If the address needs a login, or the server returns HTML (a sign-in page or an error page) instead of JSON, loading fails or shows a syntax error. Open the address in a new tab to check that it really returns JSON.
• The Firefox version currently doesn’t request extra site permissions, so opening a URL may not work. Download the file in your browser and open it with Open from disk.

Everything runs inside your browser, so files of tens of megabytes or more can get slow, especially in the tree view. Look at big files in the code view first and send only the part you need to the tree. Compact JSON also makes the code view lighter.

That’s a JSON syntax error. Look near the line number in the message. JSON doesn’t allow a trailing comma after the last item, single quotes ('), unquoted keys, or comments (//).

Click the moon (☾) button in the top-right corner of the editor. Click it again (now a sun ☼) to go back to light. Your choice is remembered.

The editor and its features are the same. The Firefox version doesn’t use extra site permissions, so Open url and loading a schema by URL may not work. To use it in a private window in Firefox, allow Run in Private Windows in JSON Editor’s settings in about:addons.

In Chrome, go to chrome://extensions › JSON Editor › Details and turn on Allow in Incognito. An editor opened in Incognito uses storage separate from your normal windows, so what you edit there doesn’t show up in a normal window.

Right-click the toolbar icon and choose Remove from Chrome (in Firefox, Remove Extension). This also deletes the document and settings stored in your browser, so download anything you need first. See the User Guide for details.