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Pac4j Alternatives
Similar projects and alternatives to pac4j
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hmpl
🐜 HMPL.js is a lightweight server-oriented template language for JavaScript. Fetch HTML, render it safely, and keep apps dynamic, modern, and small.
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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Apache Shiro
Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management
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Nimbus JOSE+JWT
JSON Web Token (JWT) implementation for Java with support for signatures (JWS), encryption (JWE) and web keys (JWK).
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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torii-rs
Torii is a powerful authentication framework for Rust applications that gives you complete control over your users' data.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better pac4j alternative or higher similarity.
pac4j discussion
pac4j reviews and mentions
Posts with mentions or reviews of pac4j.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2026-10-01.
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How to secure a JAX-RS client application with OIDC (using pac4j)
The jax-rs-pac4j library (like pac4j) supports both. It protects resources with pac4j clients through annotations, on Jersey or RESTEasy (JAX-RS is now called Jakarta REST).
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How to secure a Spark Java client application with OpenID Connect (OIDC) using pac4j
We'll use Spark 2.9 and Java 17, starting with the public pac4j demo provider. The OIDC configuration is the same as in the Spring Boot guide: that's the promise of pac4j's framework-agnostic security engine. The spark-pac4j-demo contains a more complete application.
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SAML: A Fractal of Bad Design
My goto when integrating SSO via SAML, OAuth, JWT, and other authentication mechanisms is pac4j (https://github.com/pac4j/pac4j). It has integration to and demos for various web frameworks like Spring and Scala Play. It does a lot of the heavy lifting for integrating SSO into an application.
- Show HN: Torii – a framework agnostic authentication library for Rust
- The Java security framework to protect web applications and web services
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A note from our sponsor - AppSignal
www.appsignal.com | 11 Oct 2026
Stats
Basic pac4j repo stats
5
2,533
9.7
2 days ago
pac4j/pac4j is an open source project licensed under Apache License 2.0 which is an OSI approved license.
The primary programming language of pac4j is Java.
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