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What is GraphQL?

By Priya PedamkarPriya Pedamkar

What is GraphQL

Introduction to GraphQL

GraphQL is a very powerful query language used to communicate data between a client, the browser, and a server. It allows us to structure data-driven applications much more flexibly and efficiently than a restful approach would. So imagine that we created some kind of a restful API for a website that displays books and authors. Now to retrieve information about a particular book and display that information on the web page, we would probably make an AJAX request to an endpoint. This would bring back some information like the title, genre, review, etc.

What is GraphQL?

It is a server-side open source technology developed by Facebook in order to optimize RESTful API calls. It is a data query language and an execution engine. The schemas in GraphQL can be written in GraphQL Schema Definition Language or SDL. SDL is easy to understand and simple to learn. On the other hand, the schemas in It are strongly typed, which are helpful for developers in ways that were not possible to benefit from the APIs without schemas.

Not just that, GraphQL schema is the support system of GraphQL API. The schema explains the possible outputs or responses to the arguments inputted. Thus, schema well defines the operations supported as well as the capabilities of an API without fail.

How does GraphQL make Working so Easy?

  • It reduces the data amount transferred across the wire and is choiceful about the data depending on the client’s needs. Therefore, the mobile client fetches less information as it is needed on a smaller screen. The biggest problem with most of the APIs today is that they’re deficient in strong contracts for what their operations should look like.
  • As a result, developers have found themselves in situations where they are expected to work with deprecated and deficient API documentation that lacks proper ways of knowing what API supports all operations and how to use them. GraphQL, on the other hand, has proper documentation. 

What can you do with GraphQL?

  • The structure of GraphQL servers is such that it makes it possible to declaratively fetch data. As a result, it makes it easier to gather the required data with only one request.
  • For example, Let’s imagine a situation where a person requests details of a particular singer, like name, tracks, etc. For the traditional REST pattern, this would need a minimum of two requests to two endpoints, that is, /artists and /tracks. If we use it, all the data can be defined with just one GraphQL query to request multiple resources.

Working with GraphQL

It has made frontend developers’ lives easy. All the credits go to GraphQL client libraries like Apollo or Urql. Front-end developers are getting various features like caching or optimistic UI updates for absolutely free with fields that might have entire teams dedicated to working on them if GraphQL wasn’t there. With the help of GraphQL, it is now possible to completely redesign an app’s UI without even touching the backend.

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Advantages

GraphQL APIs have a strongly typed schema.

  • No overfetching and underfetching
  • It enables rapid product development
  • Rich open-source ecosystem and an amazing community

Required Skills

Foremost, the user has to be proficient with a minimum of one programming language and the basic concepts behind this language. You also need to be proficient with Javascript syntax and ES6 syntax.

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Scope

It is now only a tremendous leap ahead of REST API design. GraphQL directly models all sorts of data traversals that a client needs to perform to do its job. It is expected there would be a significant refinement within this space over the next couple of years.

Why do we need it, and why should we use GraphQL?

  • If you are a front-end developer, you most probably won’t be working with the schema, but it will serve as an important document that allows you to know what all queries you can make.
  • If you compare that to other API standards, like Swagger for REST APIs, you have to trust that whoever wrote documentation wrote it really well, with all edge cases documented. Swagger doesn’t enforce type checking for different fields, so you can have a valid Swagger YAML file that is now also really difficult to navigate.
  • Any valid GraphQL schema in itself will help anyone know what all sorts of data they’re dealing with, and that too even if it isn’t properly documented.

Who is the Right Audience for Learning GraphQL Technologies?

GraphQL is available for a large audience. They include the client-side and server-side since they provide a large ecosystem of libraries for both sides.

How will this Technology help you in Career Growth?

  • It would be really thankful for all developers, be it the ones with a good grasp over React, Angular or Android, to learn about GraphQL and to steadily start using it. There are various communities that are extending support to beginners who are using GraphQL, such as Slack channel, Apollo and GraphQL GitHub organization.
  • Make sure to visit their portals for support content and the latest updates.
  • Varied companies are now switching to GraphQL because they understand their future prospects and significance.

Conclusion

We can conclude that it is an exciting technology, but it is mandatory to understand the tradeoffs before making important architectural decisions. APIs such as those with few entities and relationships across entities are not really suited for GraphQL. But, applications with varied domain objects like e-commerce applications where you have many entities may be suited for it much more. It is a really powerful tool, with many reasons to choose it in your projects but anyways you don’t have to forget that the most important, is choosing whichever tool is right for your project.

Recommended Articles

This has been a guide to What is GraphQL? Here we discuss the working, required skills, scope, career growth and advantages of GraphQL. You can also go through our other suggested articles to learn more –

  1. What is MySQL?
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  3. What Is Python
  4. What is SQL Server?
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