REST Vs GraphQL Vs gRPC - What to use When?

16 March, 2022
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REST Vs GraphQL Vs gRPC

These 3 are the most popular options right now and often when starting a new project there is a problem with what to use?

So, here is a small guide I created from my previous experience on REST Vs GraphQL Vs gRPC and What to use when?

To determine what category of protocol or specification I should investigate, I ask a few core questions, and then I examine the most popular among those categories and find their direct alternatives. The more prolific option within a category I use if I cannot find an alternative that meets both our technical requirements and fits into the existing workflow.

In this post, I discussed some tools that can help you determine the category of web communication that is best for you based on your needs.

If your clients use primarily - or exclusively - web browsers and you want to deliver web pages that can be easily bookmarked and navigated to, then you should continue to use REST.  

GraphQL should be used for data-centric clients, that is, those that display data relationships the majority of the time. While GraphQL has a number of competitors, I would say it's the de facto standard for data-driven clients at this point.

There are lots of integration options, a lot of support, and a lot of people who use it... it's really the gold standard in this category. 

Asynchronously communicating API-centric services, such as mobile apps and backend services, and those that interact with external sources asynchronously, such as gRPC or JSON-RPC, should consider RPC options such as gRPC or JSON-RPC. gRPC and its direct alternatives are useful if a schema is needed. Including JSON-RPC and direct alternatives to it is essential if the schema is optional.

gRPC is a perfect choice if you are specifically running multiple services on Kubernetes. gRPC is part of CNCF, and many Kubernetes components and frameworks include built-in support for it. For more complex Kubernetes deployments, it appears that gRPC will be the de facto communication protocol.

Whenever possible, I would prefer REST for websites - that is, services that use the browser as their primary, or only, client. I might mix in GraphQL if it is appropriate.

Programming REST GraphQL gRPC software Software Devlopment Software Engineer Software Developer APIs
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