Using Pagination and Limit with TypeORM

Introduction: Why is Pagination Important in Backend Development?

In order for backend applications to work efficiently, it is very important to present large data sets to users piece by piece. Pagination, that is, paging, is an excellent solution for this need. TypeORM, as a popular ORM library frequently preferred in Node.js projects, greatly simplifies pagination and limit operations. In this article, you will find detailed technical information and example codes about Using Pagination and Limit with TypeORM.

Using Pagination and Limit with TypeORM

Pagination operations in TypeORM are mostly performed using the find or QueryBuilder methods. Especially for tables with large data sets, you can increase API performance by dividing them into parts and prevent clients from being met with an unnecessary amount of data. Below you can find the details of the most common methods.

Simple Pagination with Find Method

const page = 1; // Which page
const pageSize = 10; // Number of records per page
const [users, total] = await dataSource.getRepository(User).findAndCount({
  skip: (page - 1) * pageSize,
  take: pageSize,
  order: { id: 'DESC' },
});

The skip and take parameters here are used directly in TypeORM's find function. skip specifies how many records to skip, while take specifies how many records to retrieve. This structure is one of the most practical methods in terms of Using Pagination and Limit with TypeORM.

Advanced Pagination with QueryBuilder

const page = 2;
const limit = 5;
const users = await dataSource
  .getRepository(User)
  .createQueryBuilder('user')
  .orderBy('user.createdAt', 'DESC')
  .skip((page - 1) * limit)
  .take(limit)
  .getMany();

QueryBuilder can be preferred to create more complex queries and add flexibility to pagination operations. It is especially useful when you want to paginate with relational queries or with filters. The .skip() and .take() methods also play an active role here.

Conclusion: Effective and Performant APIs with TypeORM

Using Pagination and Limit with TypeORM provides great advantages in terms of both performance and developer experience. If you want your API to work fast and stable in data-based operations in your software projects, you should definitely integrate pagination. Thanks to the conveniences offered by TypeORM, you can perform these operations securely and readably with just a few lines of code.