Q15 of 20 · GraphQL
What tools would you use to test a GraphQL API, and how do you choose?
GraphQLJuniorgraphqltoolsapici-cd
Short answer
Short answer: For exploration, a schema-aware client (Insomnia, Hoppscotch, Postman, or a GraphQL IDE like GraphiQL/Apollo Sandbox). For automated suites, any HTTP client or test library that can POST JSON and assert on the body — code-based tests in CI for regression.
Detail
Match the tool to the job:
Exploration / manual testing — you want schema autocomplete and introspection:
- Insomnia and Hoppscotch — schema-aware GraphQL support.
- Postman — GraphQL inside a full platform with collections.
- GraphQL Playground / GraphiQL / Apollo Sandbox — in-browser IDEs (Playground is largely succeeded by the latter two).
Automated regression — you want assertions in CI:
- Any code-based HTTP client/test library (supertest, REST Assured, a typed GraphQL client) that can POST the query and assert on
data/errors. - The advantage of code-based: you can assert on the error array, partial success, and even resolver/DB call counts for N+1.
How to choose: exploration tools for learning an API and one-off checks; code-based suites for anything that must run in CI and gate deploys. A common mistake is trying to run a full regression suite out of a GUI client when it belongs in code.
// WHAT INTERVIEWERS LOOK FOR
Separating exploration tools from automated-suite tooling, and putting regression in code/CI rather than a GUI.