10 Practical Script Examples for API Testing

API testing gets serious the moment you stop clicking buttons and start scripting real-world scenarios. If you’re working with any API client that supports pre request and post response scripts, you can automate validations, chain requests, mock edge cases, and catch bugs before they hit production. Here are 10 practical script examples you can actually use in day-to-day API testing 1. Validate Status Code and Response Time Always validate that your API responds correctly and within acceptable time. rq.test("Status code is 200", () => { rq.expect(rq.response.code).to.equal(200); }); rq.test("Response time is under 500ms", () => { rq.expect(rq.response.responseTime).to.be.lessThan(500); }); This is essential for login endpoints, health checks, and critical APIs. 2. Validate Required Fields in Response Instead of manually checking fields, automate it. const data = rq.response.json(); rq.test("Response contains required fields", () => { rq.expect(data).to.have.property("id"); rq.expect(da