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25cm; line-height: 120%; }a:link { } p { margin-bottom: 0.25cm; line-height: 120%; }a:link { }Aserver interprets a GraphQL query and the string returns it in aspecific format that can be understood 2. GraphQL does not requirea specific way to be transported (such as using a HTTP protocol).

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Theparser is situated in the application-layer protocol. Specificstrings are parsed by the server 1. Once the parsing has takenplace a tagged template function is exposed for parsing the GraphQLqueries which outputs a function that describes the query. Thegeneration of the abstract syntax tree (AST) is exposed by the parserat a lower level API.

Itis possible for a query to be incorrect. If any syntax errors thatoccur within the parsing then the server terminates the execution andthis is returned back to the the client. Validation is the next stepthat makes sure the query is successfully parsed. Various checks aredone by the server automatically in this process, such as: whetherthe String is a certain query type, argument validation of a string,whether it consists of a return type and various other checks takeplace.

If and only if the validation is done well, then the serverexecutes the query 1.Thepurpose of the schema is to tell the server what queries can beexecuted and the relation of different types by the clients. Theresolve functions details how the types and fields are linked to thevarious back ends and hides all of the back end complexities fromclients. It doesn’t matter how many back ends that exist within theapp, the client will see a single GraphQL endpoint with a simple,self-documenting API for the application 1.1– Helfer, J.2016. GraphQLexplained.ONLINEAvailable at:https://dev-blog.

apollodata.com/graphql-explained-5844742f195e.Accessed09January 2018.2- NickSchrock, N.2015.

GraphQLIntroduction.ONLINEAvailable at:https://reactjs.org/blog/2015/05/01/graphql-introduction.html.Accessed12January 2018.3- Cailhol,F.2015.

Graphql-parser.Experimental Facebook’s GraphQL parser.ONLINEAvailable at: https://www.npmjs.com/package/graphql-parser.

Accessed12January 2018.4- Stubailo,S. (2018).

Native code generation at Facebook – Apollo GraphQL.online Apollo GraphQL. Available at:https://dev-blog.apollodata.com/native-code-generation-at-facebook-7d6d0db4f3eeAccessed10Jan. 2018.5- Simha,D.

(2018). GraphQLCode-Gen 1.0 – Dotan Simha – Medium.online Medium. Available at:https://medium.com/@dotansimha/graphql-code-generator-a34e3785e6fb Accessed15 Jan.

2018.