Jeevith Kotta ,

Looks like something as OAuth or a JSON Web Tokens. Likely this involved a bit more than only the from-values. But when you can use the JS function to generate the special value, that leaves you only with finding the proper from field values.

Working with JS scripting, does not involve access to the DOM of the page, so you have to grep those values yourself via correlation like technics. I guess when you setup something that looks voor all the from fields and corresponding values (use reg.exp. and Ordinal=ALL, it might be not that complicated.

Success, Erik

Hello Erik, 

thank you for your response . The js code is trying to submit forms by taking the input elements . 
Though I can pass all the needed parameters using correlation to the js file,  how can load runner submit the form that that is called in js . This is something I’m unable to figure out . Any insights would be of great help to me. Thanks in advance.

Jeevith Kotta , normally you make a recording of your business flow in e.g. 'Web HTML/HTTP' protocol. That flow will then also contain the submission of the form to the backend. This submission needs to be changed (add parameters, perform your JWT (?) calculation).

You can also craft calls by hand, but that might be cumbersome. Consult the documentation and use e.g. a Network trace of your browser to see the content of that call.