meta { name: fakerjs type: http seq: 1 } post { url: {{host}}/api/echo/json body: json auth: none } body:json { { "hello": "bruno" } } assert { res.status: eq 200 } script:pre-request { const { faker } = require('@faker-js/faker'); const uuid = faker.string.uuid(); const data = req.getBody(); data.uuid = uuid; req.setBody(data); } tests { test("should return json", function() { const data = res.getBody(); const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i; const isUUID = (inputString) => { return uuidRegex.test(inputString); }; expect(data.hello).to.equal("bruno"); expect(isUUID(data.uuid)).to.be.true; }); }