Warning Do not use this to circumvent or get around a legitimate process. It is a hammer that should be used like a scalpel. Don't be "that person".

The script

Here's a client-side script that will remove any mandatory restrictions from a ServiceNow form open in your web browser. I've found it useful during testing or working through an issue where mandatory fields just get in the way.
"I know what I'm doing, just let me through."

var fs = g_form.getEditableFields(); for (var i=0; i < fs.length; i++) g_form.setMandatory(fs[i], false);

This client-side script loops through all fields on the form and makes them all optional and not mandatory. It's that simple.

This script only works in the back-end / platform UI, and doesn't work in the service portal. I haven't tried it in an agent workspace.

Screenshot in effect

To use this script in the ServiceNow Javascript Executor window ('admin' users only):

  1. press Ctrl+Shift+J to open the window,
  2. copy & paste the script in,
  3. click on "Run my code".

ServiceNow Javascript Executor

To use this script in your web browser's developer console (e.g. Chrome, Edge, Firefox, etc):

  1. open the developer tools (press F12 in Chrome in Windows),
  2. open the "Console" table / panel,
  3. ensure that the console's Javascript Contex is set to "gsft_main" (because the form loads in an IFrame in the platform UI),
  4. copy & paste the script in,
  5. press ENTER

Chrome developer tools console

Thoughts on security

This is a great example of why you shouldn't rely on security enforced by the client-side or on the browser. Don't think that a field cannot be changed because a UI policy makes it read-only, this can be undone and circumvented by anyone who wants to run their own code. ACL's are enforced server-side, no matter what the client-side wants to say about it, and should always be used for security instead of client-side functionality.