The Project which I am working now require a performance test. So, I preferred JMeter for a load test and started learning one by one. Now, When I recorded a test and included a CSV file for the dynamic parameter. I see the recorded pages has client id in many HTTP POST data pages. This application passes a JSON data for sending a request so in Body Parameter tab I see JSON type data. So, added JSON Post Extractor for one HTTP request site passes alphanumeric value `(5963948e2f123bd00a27d5cd)`. However, after I executing the test the page returns an error page. POST http://192.168.1.10/api/editClient/getClientInfo/ POST data: {"clientId":"5963948e2f123bd00a27d5cd"} Response code: 400 Response message: Bad Request Response data: Failed to authenticate Token can anyone help me on this?