Can you explain the differences between REST and GraphQL in terms of data fetching and flexibility?

In my final year at university, I worked on a group project where we developed a web application for a local charity. We decided to use REST APIs to fetch data about events and donations. Each endpoint corresponded to a specific resource, like '/events' or '/donations'. While it was straightforward to implement, we often found ourselves fetching more data than we needed or making multiple requests to get related information. This experience taught me that while REST is easy to understand for newcomers, it can lead to inefficiencies in data retrieval, especially when we wanted to customize our data requirements.

During my internship at a startup, I had the opportunity to work on a project that used GraphQL for our data fetching. Unlike my previous experience with REST, GraphQL allowed us to define the structure of the responses we needed right from the client side. For instance, when building a dashboard, we could request only the data points we were interested in, like user statistics, without over-fetching unnecessary information. This flexibility not only improved the performance of our application but also made it easier for us to iterate on features quickly. I learned the value of using GraphQL when we needed specific data and how it could streamline the development process.

In my first job as a junior developer, I worked with both REST and GraphQL APIs. We had a project where we had to integrate data from various sources. I realized that REST was effective for simple CRUD operations but became cumbersome when we had to gather data for complex queries. In contrast, the GraphQL API we implemented allowed us to fetch all necessary data in a single request, significantly improving load times and user experience. This experience highlighted the importance of selecting the right tool for the task at hand, as both REST and GraphQL have their distinct advantages depending on the specific requirements of a project.