GraphQL is a data query and manipulation language
Flexible approach for developing web applications, a driver might have been to overcome difficulties with REST-based apis. GraphQL is good for lightweight data transfers among others needed for mobile applications.
Supports reading (query), writing (mutations) and subscriptions to data changes
- makes the data transferred a conscious choice and avoids sending unnecessary data as a response
- no multiple round trips to get nested data
- avoid to construct multiple endpoints for different shapes of responses
Developed by FB in 2012, was used internally first and released for public use in 2015
Since 2018 there is a "GraphQL Foundation" which is hosted by Linux Foundation
By extending the skeletton from this repo, add implementatons below.
Only the files schema.graphql and resolvers.jsneed to be changed. An example implementation is in the git commit history. The git commit names are given in parenthesis.
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Implement a query that returns a list of employees (
Adding a query that returns a type object) -
Implement a query that searches an employee by its role (
Adding a query with an argument) -
Make queries also return the employee's address which is stored in a separate collection (
Dealing with nested objects) -
Cleanup by removing resolver logic that GraphQL can guess from the schema (
GraphQL can infer simple resolver logic) -
Implement a function that adds a new employee to the list of employees (
Adding a mutation)