pyasn1
Pure Python implementation of ASN.1 types and DER/BER/CER codecs.
Auth and security libraries PyPI BSD-2-Clause
Used in agent projects
43
0.3% of 12,697 public repos built with AI coding agents
Rank in auth and security libraries
#27 of 47
by use in those projects
Downloads
102M
PyPI, last 7 days, pyasn1
GitHub stars
53
last push Aug 10, 2026
How pyasn1 is used
pyasn1 is a dependency in 43 of the 12,697 public GitHub projects set up for AI coding agents that we scanned (0.3%), #27 of 47 in auth and security libraries. The most used alternative there is NextAuth.js. Projects that use it most often also use Requests (93.0%), urllib3 (83.7%), Pydantic (81.4%).
Often used with pyasn1
| Requests | 93.0% of pyasn1 projects · 17.5× more than average |
|---|---|
| urllib3 | 83.7% of pyasn1 projects · 55.1× more than average |
| Pydantic | 81.4% of pyasn1 projects · 15.9× more than average |
| AnyIO | 79.1% of pyasn1 projects · 54.0× more than average |
| charset-normalizer | 79.1% of pyasn1 projects · 63.5× more than average |
| Click | 79.1% of pyasn1 projects · 45.0× more than average |
| python-dotenv | 79.1% of pyasn1 projects · 12.1× more than average |
By coding agent
| Claude Code | 0.5% of projects set up for it |
|---|---|
| GitHub Copilot | 0.5% of projects set up for it |
| Cursor | 0.4% of projects set up for it |
Share of public repos configured for each agent that list pyasn1 as a dependency.
Install
| Package | pip install pyasn1 |
|---|---|
| Main stacks | Python (39), Next.js (3), Other (1) |
| Example projects | capture0x/AdStrike, siiway/NextBridge, loblawbob873-svg/posterchanai, synapticore-io/marimo-flow, ManojINaik/manimAnimationAgent |
Alternatives to pyasn1
| Tool | Used in agent projects | Downloads / wk | GitHub stars | License |
|---|---|---|---|---|
| NextAuth.js npm Complete open-source authentication solution designed for Next.js applications. |
266 (2.1%) | 6.7M | 28.4K | ISC |
| bcryptjs npm Pure JavaScript bcrypt implementation for secure password hashing without dependencies. |
256 (2.0%) | 14.7M | 3,797 | BSD-3-Clause |
| jsonwebtoken npm Create, verify and decode JSON Web Tokens for authentication and secure data transmission. |
241 (1.9%) | 59.3M | 18.2K | MIT |
| cryptography pypi Python library providing cryptographic recipes and primitives for secure applications. |
213 (1.7%) | 281M | 7,803 | — |
| jose npm Comprehensive JWT and JWK handling for Node.js and web runtimes. |
141 (1.1%) | 151M | 7,824 | MIT |
| PyJWT pypi Python library for encoding and decoding JSON Web Tokens. |
128 (1.0%) | 154M | 5,714 | — |
| Better Auth npm Comprehensive authentication framework for TypeScript with multiple strategies. |
126 (1.0%) | 11.4M | 30.2K | MIT |
| Helmet npm Express middleware that sets HTTP security headers to prevent vulnerabilities. |
125 (1.0%) | 16.2M | 10.7K | MIT |