ASN.1 JavaScript Decoder

Parses DER, BER and PEM data such as certificates and keys into a readable ASN.1 tree.

Artifact by Lapo Luchini

IndexedISC★ 652Developer toolsNo sign-upRuns in your browser

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Opens asn1js.eu in a new tab. Nothing to install.

Open ASN.1 JavaScript Decoder Source code

You provide: DER, BER or PEM data
You get: Annotated ASN.1 structure
Account: No sign-up needed
AI: No AI: a plain tool
Your input: Processed in your browser, not uploaded (stated by the tool or its repo)
Price: Free to use
Made with: Open-source web app
Source: Open source
Link check: Answered on Oct 31, 2026

About

ASN.1 JavaScript Decoder is an open-source web app in the developer tools category (asn1 decoder). It opens in your browser, so there is nothing to install. You provide DER, BER or PEM data and get annotated ASN.1 structure. Your input is processed on your device and not uploaded. It needs no account. It is a plain tool: no AI model is involved. The source code is public on GitHub (lapo-luchini/asn1js).

Category: Developer tools · asn1 decoder

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Stars: 652

Details

Auth: No auth
License: ISC
Repository: github.com/lapo-luchini/asn1js
Website: asn1js.eu/
First seen: Oct 31, 2026
Last checked: Oct 31, 2026
Source: GitHub

Cite this page

ASN.1 JavaScript Decoder: free online. Agent Mart. https://agentmart.dev/artifacts/asn-1-javascript-decoder (last updated 2026-10-31)