Fast, file-backed, scalable JSON token engine

CRUDJT is a B-tree–backed persistent token engine for stateful user sessions

It provides:

• predictable disk usage
• low latency across multiple processes
• no external database requirement

Getting Started

Install CRUDJT in your language of choice:

• Ruby: gem install crudjt
• Python: pip install crudjt
• Java: Use JARs from Maven Central Repository
• JavaScript: npm install crudjt
• Elixir: {:crudjt, "~> 1.0.0"}
• Erlang: See repository for usage and integration instructions
• Go: go get github.com/crudjt/crudjt-go@latest
• PHP: composer require crudjt/crudjt-php

Performance one of SDK

40 000 requests up to 256 bytes — median over 10 runs
macOS 15.7.4, ARM64 (Apple M1)
JavaScript 20.20.0
In-process benchmark; Redis accessed via localhost TCP

Function	CRUDJT (JavaScript)	JWT (JavaScript)	redis-session-store (Ruby, Rails 8.0.2.1)
C	0.372 second	16.537 seconds	2.909 seconds
R	0.010 second	16.678 seconds	4.436 seconds
U	0.684 second	X	2.124 seconds
D	0.200 second	X	3.984 seconds

Full benchmark results

Disk footprint

40 000 tokens of 256 bytes each — median over 10 creates
darwin23, APFS

48 MB

Full disk footprint results

Scaling & Deployment

CRUDJT ships with an embedded gRPC transport layer, enabling fast inter-process communication without external brokers

The server is designed for vertical scaling with predictable, file-backed storage and stable latency under load

➡️ Run a production-ready server in seconds using Docker:
Docker Server