Express Api Structure

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Express Api Structure

Structure for Express based API server


The Structuresrc contains the whole source code of the api. It is divided into three directories: api, config, and constants. The index.js file acts as the entry point to the application. Constants that are common across environments are defined in the constants.common.js file, while environment-specific constants are defined in the or files. Sensitive information like database credentials should not be included in the constants and should be defined in the .env file instead. The config directory contains self-contained config files for different modules in the api. The api directory is where most of the work will be done and is further divided into controllers, middlewares, repository, routes, services, utils, and validations. Each directory has a specific purpose and naming convention. Middlewares handle common functions needed across routes, the repository houses the database queries, and the controllers contain the business logic for specific api paths.


  • Source code for the API
  • Separation of environment-specific constants
  • Self-contained config files for easy scaling and maintainability
  • Division of responsibilities in the api directory
  • Middleware functions for error handling and authentication
  • Database queries organized in the repository directory
  • Naming conventions for controllers and endpoints


To install the theme, follow these steps:

  1. Clone the repository: git clone <repository-url>
  2. Navigate to the src directory: cd src
  3. Install dependencies: npm install
  4. Set up the .env file with the necessary configurations
  5. Start the application: npm start


The Structuresrc provides a comprehensive source code for an api. It follows a modular structure with separate directories for different functionalities such as config, constants, api, and more. This structure allows for easy scaling and maintainability of the application. The api directory is where most of the development work will be done, with controllers, middlewares, repository, and other subdirectories containing specific functions and logic. By following the suggested naming conventions and conventions for file organization, developers can build a robust api with clear separation of responsibilities.


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