Error: Setting Header After It Is Sent - Help Me Understand Why?

I don't get how I'm setting a header after it is sent to client? code: During form submission a post ajax request is made, the response is a json object that is returned to the cli

Solution 1:

console.log(body.req); this is wrong. It should be console.log(req.body);. This generally happens when the program exited but still, there is a function callback in the stack. This should fix your problem. If it didn't please share the console log if printed any