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Kill the process manually
For Mac/Linux
To find the process id (PID) associated with the port

⇒ lsof -i tcp:3000 
COMMAND PID   USER  FD  TYPE DEVICE             SIZE/OFF NODE NAME 
node    44475 chen5 31u IPv4 0x8b1721168764e4bf 0t0 TCP *:strexec-s (LISTEN)

Then to kill the process
kill -9 44475
Use-9option to make sure the process dies immediately
If you get permissions errors, you may need to use the sudo keyword, for example:
sudo kill -9 44475

When checking post route it would not work on the test URL http://localhost:8000/api/signup

In order to simulate a frontend we need to use Postman to run the controller script & simulate frontend to display that the Signup route is working.

On Postman we can see that the Signup route is working on the url and the message is being displayed whilst in the browser it displays an error message.