API Testing Interview Questions

40 must-know API testing questions with quick, interview-ready answers

API Testing Interview Questions is a 22-page interview q&a resource compiled by practising QA engineers. 40 must-know API testing questions with quick, interview-ready answers. Every page is previewable before you request access, so you can judge the depth, formatting and examples yourself instead of relying on a description.

Pages: 22
Compiled by: SoftwareTestPilot editorial team
Reviewed by: Priyanka G.
Last updated: 2 September 2026

Contents summary

HTTP methods & status codes
Headers, auth & JSON schema questions
Test design & automation questions
Security & performance testing questions
Real debugging scenarios
Interview answer formula (Define, Compare, Test, Prove)

Who this is for

• Testers actively interviewing for QA or SDET roles
• Engineers returning to interviews after a long stint on one project
• Freshers who know the theory but freeze on follow-up questions

What you will be able to do

• Answer the most repeated screening questions without rehearsing scripts
• Explain your own project work using the structure interviewers expect
• Spot which follow-up question usually comes next and prepare for it

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