GM.deleteValue

This method deletes an existing name / value pair from storage.

See GM.setValue for details regarding the storage of these values.

function GM.deleteValue( name )

Compatibility: Greasemonkey 4.0+

name

Property name to delete. See GM.setValue for details on what names are valid.

A Promise, resolved successfully with no value on success, rejected with no value on failure.

Delete the stored name / value pair that has the name 'foo':

GM.deleteValue("foo");

Example showing the use of GM.listValues to delete all stored name / value pairs:

let keys = await GM.listValues();
for (let key of keys) {
  GM.deleteValue(key);
}

Similar example to the above, but with a filter within the loop to exclude 'a' and 'foo' and 'bar' from deletion:

let keysToKeep = ['a', 'foo', 'bar'];
let keys = await GM.listValues();
for (let key of keys) {
  if (!keysToKeep.includes(key)) {
    GM.deleteValue(key);
  }
}

• GM.getValue
• GM.setValue
• GM.listValues