Mendel Framework - Self-Hosted A/B Testing Without Vendor Lock-In

Self-hosted A/B testing & feature flags for Node.js without vendor lock-in

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Updated Jul 2026 · Added Jul 2026

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What is Mendel Framework?

Mendel Framework is a production-grade, self-hosted A/B testing and feature flag framework for Node.js applications. It provides deterministic bucketing, Mongoose-backed storage, layered mutual exclusion, and a React admin UI - enabling teams to run experiments and manage feature flags without SaaS dependencies or vendor lock-in. Built for teams wanting GrowthBook/LaunchDarkly-style capabilities while maintaining full control over infrastructure.

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Key Features of Mendel Framework

Deterministic bucketing with FNV-1a hashing
Two rollout modes: A/B testing and feature flags
Rich targeting rules (eq, in, gt, lt, contains, regex, exists)
Mongoose-backed storage
Layered mutual exclusion
Drop-in Express routes
React admin UI
Statistically sound experiment design

Who Should Use Mendel Framework?

Run A/B tests on product features

Manage feature flags in Node.js applications

Control feature rollouts across servers and regions

Experiment with deterministic bucketing across SDKs

Manage audience targeting with attribute-based rules

Mendel Framework: Pros & Cons

✓Pros

Deterministic bucketing ensures consistent variant assignment across servers and time
No SaaS dependency or vendor lock-in
Runs entirely on your own infrastructure and Mongo cluster
Battery-included with Express integration and admin UI
No coordination required between server and client SDKs
Statistically sound experimentation framework

Frequently Asked Questions about Mendel Framework

What is Mendel Framework?

Mendel Framework is a production-grade, self-hosted A/B testing and feature flag framework for Node.js applications that provides GrowthBook/LaunchDarkly-style capabilities without SaaS dependency.

How does deterministic bucketing work?

It uses FNV-1a hashing to keep (salt, item_id) → variant assignments stable across servers and over time, requiring no coordination between server and client SDKs.

What targeting options are available?

The framework supports rich targeting rules including eq, in, gt, gte, lt, lte, contains, starts_with, ends_with, regex, exists and more, combined with all/any semantics.

Does it require external services?

No, everything runs on your own Mongo cluster, behind your own auth, in your own VPC with full control over infrastructure.