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Evo

Backend API for Evo, a mobile-first nutrition app powered by AI that will be released on the app stores (App Store / Google Play).

🚧 Actively under development. Features, routes, and database schema are still subject to frequent changes. Not recommended for production use.

About the project

Evo helps users log meals, track nutritional goals (calories, macros), and receive AI-generated meal plans (Google Gemini), all from a mobile app. This repository contains only the API that powers the app.

Features

• 🍽️ Meals — create, list, update, and delete meals and items, with a daily summary
• 🎯 Nutritional goals (TDEE) — calculation and update of calorie and macronutrient targets
• 🤖 AI chat — nutrition-focused conversation powered by Gemini
• 📋 Meal plan — automatic meal plan generation via AI, respecting user restrictions and preferences
• ⚙️ Preferences and dietary restrictions — diet type configuration, excluded foods, restrictions (gluten, lactose, etc.)
• 🥗 Food reference database — nutritional reference for foods (calories and macros per 100g)
• ⚡ Redis caching — caching for goals, meals, meal plan, and preferences

⚠️ User authentication (login, JWT) is not implemented yet — routes currently operate with a default user (DEFAULT_USER_ID) for development purposes.

Tech stack

• Node.js + TypeScript
• Express 5
• Prisma ORM + PostgreSQL
• Redis (cache)
• Google Gemini API (@google/genai) — generative AI
• Zod — schema validation
• Cloudinary — image upload/storage
• Nodemailer — email sending
• Bcrypt / jsonwebtoken — ready for authentication (in progress)
• ESLint + Prettier — code standards

Project structure

src/
├── app.ts                 # Express setup and route registration
├── server.ts               # entry point (starts the server)
└── lib/
    ├── AI/                  # AI chat (Gemini)
    ├── meals/               # meals and items
    ├── meal-plan/           # meal plan generation and management
    ├── nutrition-goals/     # nutritional goals (TDEE)
    ├── user-preferences/    # dietary preferences and restrictions
    ├── prisma/              # Prisma client
    └── redis/               # Redis client

prisma/
├── schema.prisma            # database schema
└── seed.ts                  # initial database seed

Each module under src/lib follows the controller/, routes/, services/, and (when applicable) schemas/ pattern.

Environment requirements

• Node.js 20+
• Yarn
• PostgreSQL
• Redis
• A Google Gemini API key

Environment variables

Variable	Description
DATABASE_URL	PostgreSQL connection string
REDIS_URL	Redis connection string
GEMINI_API_KEY	Google Gemini API key
GOOGLE_GENAI_API_KEY	Google GenAI API key
DEFAULT_USER_ID	Default user ID used while there's no login
ADMIN_NAME	Admin user name (seed)
ADMIN_EMAIL	Admin user email (seed)
ADMIN_PASSWORD	Admin user password (seed)
PORT	Server port (optional, defaults to 3000)

Database

yarn prisma:generate   # generates the Prisma Client
yarn prisma:migrate    # applies migrations
yarn seed               # seeds the database with initial data

Running the server

yarn dev     # development mode (hot reload)
yarn build   # production build
yarn start   # runs the production build

The server runs on http://localhost:3000 by default.

Main endpoints

Method	Route	Description
GET	/	Health check
POST	/meals	Create a meal
GET	/meals/daily	List today's meals
GET	/meals/daily/:mealType	Get meal details by type
GET	/meals/summary	Daily nutritional summary
PUT	/meals/daily/:mealId	Update a meal
DELETE	/meals/daily/:mealId	Delete a meal
DELETE	/meals/daily/:mealId/:itemId	Delete an item from a meal
GET	/TDEE	Get nutritional goal
PUT	/TDEE	Create/update nutritional goal
POST	/ai/chat	Chat with the nutrition AI
GET	/meal-plan/active	Get the active meal plan
POST	/meal-plan/generate	Generate a new meal plan via AI
PUT	/meal-plan	Update the meal plan
GET	/preferences	Get dietary preferences
PATCH	/preferences	Update dietary preferences
GET	/preferences/restrictions	Get dietary restrictions
PATCH	/preferences/restrictions	Update dietary restrictions

Postman collection available in postman/.

Available scripts

Command	Description
yarn dev	Starts the server in development mode
yarn build	Generates the Prisma Client and compiles TS
yarn start	Runs the production build
yarn prisma:generate	Generates the Prisma Client
yarn prisma:migrate	Runs Prisma migrations
yarn seed	Seeds the database with initial data
yarn lint	Runs ESLint
yarn lint:fix	Runs ESLint and fixes what it can
yarn format	Formats the code with Prettier

Roadmap

• User authentication (JWT / Google and Apple OAuth)
• Mobile app (front-end)
• Meal photo upload (AI recognition)
• Weight and hydration history in the API
• App store release

License

Proprietary project — restricted-use code, no open source license. All rights reserved.

Author

Geovani Rodrigues