Episode 530: Tanmai Gopal on GraphQL

Integration

GraphQL offers a versatile approach to API development, allowing integration with various data sources, including relational and NoSQL databases. Tanmai Gopal explains that GraphQL can be implemented on top of existing systems, providing a flexible API surface for developers working at the edge, such as in mobile or serverless environments 1. This flexibility is crucial in enterprise settings where gradual transitions from REST to GraphQL are necessary. Gopal highlights the ability to create REST endpoints from GraphQL queries, facilitating seamless integration with existing REST infrastructure 2.

You create the GraphQL query and you name it, and that becomes a REST endpoint.

--- Tanmai Gopal

   

Query Management

Managing GraphQL API queries involves optimizing data fetching and ensuring efficient communication between systems. Tanmai Gopal discusses the importance of knowing query structures in advance to optimize database interactions, such as using joins or sharding based on data source capabilities 3. He emphasizes the need for flexible APIs in dynamic environments, where developers can query data as needed while maintaining security through execution quotas 4. This approach allows for asynchronous and automatic communication between systems, reducing the need for manual intervention.

You might have very inefficient ways of fetching that data because you don't know what data you want upfront.

--- Tanmai Gopal

   

Limitations

While GraphQL is powerful, it is not always the best choice for every application. Tanmai Gopal points out that GraphQL is unsuitable for non-JSON data types, such as video or binary files, and for applications with heavy write operations, like IoT devices emitting continuous data 5. In such cases, the benefits of GraphQL diminish, as it is primarily optimized for querying rather than mutations. Gopal advises against using GraphQL when the workload is predominantly write-heavy, suggesting alternative solutions that better handle such scenarios.

If your API is 90% mutate and 10% query, you lose the benefits of GraphQL.

--- Tanmai Gopal