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
Use it
Opens asn1js.eu in a new tab. Nothing to install.
- 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 Nov 1, 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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Signals
- Stars
- 652
Details
- Auth
- No auth
- License
- ISC
- Repository
- github.com/lapo-luchini/asn1js
- Website
- asn1js.eu/
- First seen
- Oct 31, 2026
- Last checked
- Nov 1, 2026
- Source
- GitHub
Cite this page
ASN.1 JavaScript Decoder: free online. Agent Mart. https://agentmart.dev/artifacts/asn-1-javascript-decoder (last updated 2026-11-01)