How to Implement Pagination in Node.js and MongoDB with Total Page Count

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Understanding the Basics of Pagination

Before diving into the implementation, it’s essential to understand the pagination workflow. The core idea is to define a limit on how many records should be displayed on each page and determine how many pages exist based on the total record count.

Key Concepts

Page: Refers to the current page number that the user wants to access.

Size: Number of records to display per page.

Total Documents: The entire number of records in the database from which the pages will be generated.

Step-by-Step Implementation of Pagination

1. Setting Up the Route

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In this code snippet, we extract the page and size from the request query parameters and establish default values for them if they are not provided.

2. Fetching Paginated Data

Once the page and size are defined, we can query our MongoDB collection using find(), limit(), and skip() methods.

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limit sets the maximum number of records to return, while skip determines how many records to skip before returning the data for the current page.

3. Counting Total Documents

To calculate total pages, we need to know how many documents are available in the collection. We can achieve this using the countDocuments() method.

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4. Calculating Previous and Next Pages

To provide users with information about previous and next pages, we can perform simple calculations based on the total records, current page, and page size.

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Previous Pages: The number of pages before the current one.

Next Pages: The total number of pages after the current page, calculated from the remaining documents.

5. Sending the Response

Finally, send the response back to the client with all required data including paginated records, total pages, and navigation details.

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This response will contain:

The current page number.

The size of records shown per page.

The fetched data (purchase orders).

Number of previous and next pages to help with navigation.

Conclusion