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I would like, from the Electron index.html file, to modify a config file present in the.asar of my application. In my case I need to change, if necessary, my application database config in order to work.

I understood that .asar is in readOnly and I wanted to know if there is a way to modify this config file from electron without changing its position in my application?

I see the extraResources option but I did not understand how its work.

It's also important that the config file stay in myapp/config folder.

Thanks for your help :)

I would like, from the Electron index.html file, to modify a config file present in the.asar of my application. In my case I need to change, if necessary, my application database config in order to work.

I understood that .asar is in readOnly and I wanted to know if there is a way to modify this config file from electron without changing its position in my application?

I see the extraResources option but I did not understand how its work.

It's also important that the config file stay in myapp/config folder.

Thanks for your help :)

• javascript
• electron
• asar

Share Improve this question Follow asked Jun 11, 2018 at 15:08 SynoSyno 4111 silver badge66 bronze badges 1

• I am also having similar issue. I want a file to be editable. Were you able to find solution to your problem? – vaasu varma Commented Nov 11, 2020 at 13:04

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5 Answers 5

Sorted by: Reset to default 2

What build tool do you use? If you are using electron builder, you can check out asarUnpack in configuration file here or extraFiles here

I was able to edit the read-only file by first changing the file permissions programmatically and then editing it.

fs.chmod(filename, 0666, (error) => {
        console.log('Changed file permissions');
    });

   ...
    code to modify file
   ...

asar is in readonly

as you mentioned asar intended to be readonly package. For runtime-changing config, you should place it outside of asar and change values accordingly.

To manage settings you should use a node package that's specifically designed for this, like electron-settings or preferences.

As an alternative one may manually read an write config files that you place in the platform's native config directory.

---

Mutable application settings shouldn't be stored in the asar file. If it's required to replace a file in an asar archive for any other reason, use the the asar program to extract the entire archive to a temporary directory, replace the file(s) you want, then create a new asar file, replacing the original asar file.

• To unpack .asar files -> asar extract electron.asar app

• modify as per your needs

• To pack .asar files -> asar pack . electron.asar

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