Opening an ASAR File

The ASAR file type is primarily associated with Electron.

ASAR	File extension: ASAR
	File type:	archive

What is an ASAR file?

ASAR files mostly belong to Electron. ASAR files are specialized archives used to package the resources of an Electron application. They bundle the app’s code and assets into a single file that the Electron runtime can read.

Bundled Files: These archives group JavaScript files, images, styles, and other assets together.

JSON Index: A JSON-based header keeps track of file locations inside the archive.

Performance: Grouping files helps improve the app’s load time by reducing the number of file system calls.

Tool Support: The asar tool, part of the Electron ecosystem, is used to pack and extract these archives.

FilExt.com notes: ASAR files are not compressed by default, so once extracted the content remains in a readable format. This structure allows developers to quickly extract or view the underlying files using Node.js tools. For more technical details, check out the Electron ASAR tool.

How can I open an ASAR file?

You need a suitable software like Electron to open an ASAR file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your ASAR file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a ASAR file directly in the browser:. Just drag the file onto this browser window and drop it.

Online ASAR Text Viewer

Choose your .asar file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert ASAR files:

Electron
See the previous paragraphs to learn more about the main application. ASAR files are often referred to as Electron developers because this type of file is primarily created or used by this software.
Electron
An ASAR file is an archive format used to package source code for Electron-based applications. It's designed to improve performance by reducing individual file access operations, especially beneficial for applications with a large number of small files, common in web-based applications packaged for desktop environments. The archive is structured to allow access to its contents as if they were regular files and folders within the application's file system, simplifying development and deployment. While primarily used for application code, it can also contain other assets like images and configuration files. The format is not compressed by default, prioritizing access speed over reduced file size, but compression can be applied if needed. Tools exist to create, extract, and manipulate ASAR archives, integrating them into the Electron development workflow. This file format is classified as Compressed file.

ASAR file format details:

Why is it important to know the file format? This is the only way to find out which program to use to open the file. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. So a detailed analysis of a file is vital in order to determine the format and the associated program. Our examination of the ASAR files comes to the following conclusion:

ASAR is rarely used as a file extension and predominantly uses a uniform format. The following file formats are most commonly found in ASAR files:

85% of all ASAR files are asar Electron Archive files. The content also consists of readable text fragments, which can be viewed with the help of a text editor. The files are often between 1 MB and 130 MB in size. The file type was developed only in the last few years. The following keywords are characteristic: files, size, offset, json and package. The file name app.asar or electron.asar is typical for these files.
4% of all ASAR files store the data in the CAP file format. CAP files are compressed archives. The first bytes (the signature) are 'MSCF' (short for MicroSoft Cabinet File). They consist of unreadable binary data. ASAR files are between 310 KB and 390 KB in size.

All other ASAR files (11%) have no uniform format. If you want to find out which format your ASAR file belongs to, just click on the button "Choose your .asar file to analyze".

Technical Data for ASAR File Extension

File classification:

Developer

Related files:

pkg, aspr, asr, pak, node, sar, aar, js, dll, exe, nss, zip, tar, rar, 7z

an asar archive is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with ASAR files

Associate the ASAR file extension with the correct application.
Update your software that should actually open archives. Because only the current version supports the latest ASAR file format. Search, therefore, e.g. on the manufacturer website after an available Electron update.
To make sure that your ASAR file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .ASAR file online - secure, fast, and no downloads needed.