Some examples are empty or null values or very long or very short inputs. Error handling: return error responses in case of invalid queries or mutations, unauthorized access, or data validation failures.Schema validation: Are fields, data types, or nested objects following the initially designed structure? Discrepancies in the format can yield errors in API responses.Query and mutation: flows, operations, and procedures of APIs need to be returning accurate results and properly save in a database.To maintain the API’s reliability and performance, below are what needs to be tested: GraphQL API testing checks the correctness of the schemas, queries, and mutations created for an API. You can use these tools to explore and test GraphQL APIs, as well as to create and execute queries. GraphiQL or GraphQL Playground provides a visual interface for writing GraphQL queries. You can make requests and parse the response in a command-line environment. Using a command-line toolĬommand-line tools such as Curl, or HTTPie are used to make HTTP requests to the GraphQL API. The response will be in JSON format, which you can parse and use in your application. To do this, you set the request URL to the GraphQL endpoint and specify the GraphQL query as the request body. GraphQL API can also be called using a REST client such as Postman or Insomnia. Examples of client libraries include Apollo Client for JavaScript, Apollo Android for Android, and graphql-java for Java. The client library will handle the request and response objects, and provide a convenient way to call the GraphQL API. This approach involves using a client library specific to the programming language you are using. 4 simple ways to call a GraphQL API Using a GraphQL client library This makes it faster than REST APIs as it doesn’t have to make multiple calls to different endpoints to get your data. The built-in versioning that GraphQL offers enables developers to make enhancements to current REST APIs without breaking existing clients.
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