Streamline Your API Development with Sequelize ORM and TypeScript
Are you tired of writing raw SQL queries for your API? Do you want to simplify your database interactions and focus on building a robust application? Look no further! With the power of Sequelize ORM and TypeScript, you can create a scalable and maintainable API with ease.
Setting Up the Project
To get started, let’s create a new project directory and install the necessary dependencies, including Node.js, yarn, and an IDE or text editor of your choice. We’ll also set up a simple Express.js API to create a virtual cookbook that stores recipes and ingredients, and tags our recipes with popular categories.
Configuring TypeScript
Next, we’ll add TypeScript to our project and initialize it with a configuration file. This will allow us to define a simple API structure and create project directories and files to match our outline.
Introducing Sequelize ORM
Now it’s time to bring in the fun stuff – Sequelize ORM! We’ll add Sequelize to our project and initiate its connection to our database. With Sequelize, we can register models, create and update data, and run queries with ease.
Defining Models and Interfaces
Let’s create an Ingredient model that extends the Sequelize model class. We’ll define interfaces for IngredientAttributes, IngredientInput, and IngredientOutput, and use the model sync method to create the target table in our connected database.
Using Models in DAL and Services
In our data access layer (DAL), we’ll implement our Sequelize model queries. We’ll define some commonly needed CRUD queries using our ModelInput type definition and placing any additional types in our db/dal/types.ts file.
Powering Up with Routes and Controllers
Now that we have services fetching our data from our database, it’s time to bring it all together with routes and controllers. We’ll create our Ingredients routes, update our src/index.ts file to import our exported routes, and register them to our Express.js server.
Adding DTOs and Mappers
To support typing the parameters and results between the routes and controllers, we’ll add data transfer objects (DTOs) and mappers to transform the results.
Final Touches
Finally, let’s add a build script to run our API and visit our ingredient endpoints at http://localhost:3000/api/v1/ingredients.
The Benefits of Using Sequelize with TypeScript
By using Sequelize with TypeScript in our project, we can write less code, abstract the database engine, and define strict types for model input and output. This makes our code more consistent, even if we change database types, and can prevent the occurrence of SQL injection to our tables.
Get Started Today!
Want to see the final product in action? Check out the entire code from this article on Github. And don’t forget to share your ideas on cool ways to use Sequelize in your application or ask any questions you have in the comment section!