Writing Queries in GraphQL

With GraphQL, developers may request just what data they require. You may customize queries to meet the needs of your application, in contrast to standard REST APIs where many endpoints provide fixed data formats.

In GraphQL, the query keyword and operation name are used to start creating a query. Nesting fields are possible and over-fetching is avoided because the structure is similar to the data you wish to obtain.

Following is the simple GraphQL query

query {
  user(id: 1) {
    name
    email
    posts {
      title
      body
    }
  }
}

here is the breakdown of the above query:

• query: This keyword marks the beginning of a GraphQL query operation. It indicates that you are fetching data from the server.
• user(id: 1): This is the root field of the query, and it’s named user. It takes an argument id with a value of 1. This implies that you want to retrieve information about the user with the ID of 1.
• name and email: These are fields requested under the user field. They specify that you want to retrieve the name and email attributes of the user with ID 1.
• posts: This is another field under the user field. It suggests that you want to retrieve information about the posts associated with the user with ID 1.
• title and body: These are fields requested under the posts field. They specify that you want to retrieve the title and body attributes of each post associated with the user.

GraphQL has developed into an effective API language that offers developers more effective and adaptable ways to work with data. By enabling clients to request only the data they require, GraphQL, in contrast with traditional REST APIs, removes over- and under-conditioning. In this article, we are going to go through the fundamentals of creating and executing queries in GraphQL.