VSCode ASN1js

Using this extension you can decode ASN.1 data directly in your editor.

Features

When you have an editor open with ASN.1 content (in either a PEM armor, or raw Base64, or raw hexadecimal) you can decode it by using the "ASN.1 decode" command. By right-clicking the explorer view, you can also decode binary (DER and BER) files.

TODO

• This document is currently incomplete
• Add tests to this extension

Developer installation

You can test (and develop) this extension locally with the following commands:

$ git clone https://github.com/lapo-luchini/vscode-asn1js.git
$ cd vscode-asn1js
$ node prepublish

You can now open the folder in VSCode and press F5 to execute a new VSCode session which includes the extension.

Known Issues

• Hex view is maybe too much with low width

Release Notes

0.2.2 (2025-04-25)

• Decode window is now properly shown on restart
• Open decode window to the side by default
• Add configuration option to keep opening window in current column
• Add configuration option to force decode on all file extensions

0.2.1 (2025-04-17)

• Decode files with right click from explorer
• Properly support binary files (e.g. DER)

0.2.0 (2025-04-12)

• Update to asn1js 2.0.5
• Improve dependency packaging method

0.1.4 (2024-05-28)

• Properly ignore files
• Remove old "hide subtree" menu option

0.1.3 (2024-05-28)

• Fix missing files

0.1.2

• New tree mode

0.1.1 (2024-04-23)

• Initial release