I donβt believe this is limited to the app itself. If you open up the chrome console and create an object (e.g.: var tests = { "x-test-msg-sign": "foo"};) and then try to access it using dot notation, it should also throw an error. Have you tried using bracket notation instead? Example: pm.globals.set("x-teste-msg-sign",jsonData['x-teste-msg-sign']) Can you try that and see if it helps?