Feature Flag Service (MVP)

A developer-focused SaaS for managing feature flags, environments, and targeting rules. Built with NestJS + TypeScript for the backend, Next.js + Tailwind for the dashboard.

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🧩 What is this app?

This is a feature management platform: developers can turn features on and off in their apps dynamically without redeploying code.

It allows you to:

• Roll out new features gradually (percentage rollout).
• Enable/disable features for specific users or groups.
• Manage multiple projects and environments (dev, staging, production) in one place.

Think of it as a remote switchboard for your app’s features.

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🛠️ Why you would use it

1. Safe feature releases – Release features to a small % of users first.
2. Custom targeting – Show different features to different user segments.
3. Centralized control – Manage all projects, environments, and flags from a single dashboard.

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🎯 Core MVP Features

• Projects & Environments

  • Create multiple projects and environments (e.g., dev, prod).

• Feature Flags

  • Boolean flags (enabled / disabled).
  • Config flags with JSON values.

• Targeting Rules

  • Percentage rollout (e.g., enable feature for 10% of users).
  • Attribute-based rules (e.g., country, userId).

• Dashboard

  • Manage projects, environments, and flags in a web UI.

• Authentication

  • User registration, login, and API keys for access.

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⚡ Getting Started (MVP)

1. Clone repo

git clone <your-repo-url>
cd feature-flags-service

2. Install dependencies

npm install

3. Setup Database

• Configure .env in the backend with your Postgres connection string:

DATABASE_URL="postgresql://user:password@localhost:5432/feature_flags"

• Run Prisma migrations:

npx prisma migrate dev --name init

4. Run Development Server

# backend (NestJS API)
npm run dev:api

# frontend (Next.js dashboard)
npm run dev:web

• Dashboard: http://localhost:3000
• API: http://localhost:3001

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Build & Develop (Optional Turbo Repo)

To build or develop multiple packages, you can use Turbo:

# Build all
turbo build

# Develop all
turbo dev

You can also filter for specific packages:

turbo dev --filter=web
turbo build --filter=api

Postman collection

• Import Feature Flags Service.postman_collection.json to Postman