GraphQL is one of the leading languages in the tech industry today. It serves as a query language syntax, an execution engine, and a specification. Let us look at an example to understand why and how Query language is used. Let us understand the GraphQL Backend Development Framework.
The user query is as follows
{
user(id: 2) {
Name
Gender
Contactnumber
}
}
And the JSON response might be as follows
{
“user”: {
“Name”: “Jack”
“Gender”: “Male”
“Contactnumber” : “7283632991”
}
}
Using the GraphQL the client application can be allowed to request only the required data and the data will be returned according to the particular query.
The Execution engine plays a vital role as it is responsible for the JSON response for the query entered. The execution engine has a schema and resolvers.
GraphQl schema can be described as a custom typed language. GraphQL can validate the queries with the help of the defined schema.
The schema for the above query looks as follows
Type User {
Name: String
Gender: String
Contactnumber: String
}
Type Query {
user: User
}
After the queries determined to be valid. A resolver function backs every field of each GraphQL type.
The resolver query looks as follows
Query: {
user(obj, args, context, info)
{
return context.db.loadUserById(args.id).then(
userData=> new User(userDate)
)
}
}
The specification is very particular about the GraphQL’s syntax. The working of the schema and resolvers are considered. It allows the GraphQL servers to be designed in many programming languages. Here are some tools for building API’s with GraphQL.
Tools for API development with GraphQL
Npm for express
Using npm package for the GraphQL you need to manually do your schemes, queries, mutations etc.
GraphQL Package
This gives you the ability to have a visual environment for your queries etc. Compared to the GraphQL package from npm, this option proves much easier.. Here you get sandbox environment that makes development easy. If you are into sandbox there is a GraphQLhub.com where you can find many amazing API’s like GitHub to try your GraphQL skills.
Apollo
It is a platform that gives many helpful things while building GraphQL server, it also gives us clients. Apollo provides us with things like cloud functions. It also allows us to implement production and development workflow, etc by adding cloud services and opensource devtools
Azure functions
Using Apollo you can get great support for the Azure functions by which you can build GraphQl without worrying about the query as the library handles it and pass it over to Azur functions
Prisma
Prisma is a little similar to Apollo. It can use for clients and servers. Sometimes it acts as the intermediate or middle layer between GraphQL and the database.. When working with GraphQL, if you encounter issues you’re unsure how to resolve, Prisma can assist and resolve them for you.
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