Opera file
File type: Internet related file
The JSOBJ file extension identifies an internal file used by the Opera web browser.
It is part of Opera's own data and is not normally a document intended for direct use by the user.
File type category:
Internet related file
Date updated: September 30, 2026
The JSOBJ file extension is associated with the Opera web browser from Opera Software. A JSOBJ file is one of Opera's internal files and may contain data used by the browser when it runs.
The MIME type is application/vnd.opera.jsobj. The file belongs to Opera's internal data rather than to a general-purpose, user-editable document format.
This file type is associated with Opera on Microsoft Windows. Opera normally creates and reads JSOBJ files automatically, so users generally do not need to manage them directly.
Opera on Microsoft Windows normally creates and reads JSOBJ files automatically. It is an internal browser file and may not provide useful content when opened independently.
Do not rename or edit the file unless Opera documentation specifically instructs you to do so, because changing internal files can affect the browser's data.
A JSOBJ file is not normally converted to another format. It is an internal Opera file rather than a user document, and there is no general-purpose conversion process for it.
When browser data needs to be moved or saved, use the relevant import, export, backup, or synchronization features in Opera instead of converting the JSOBJ file directly.
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