JavaScript expression to filter out few keys from input JSON object

I have this JSON object like this –

{
    "key1": "abc",
    "key2": 123,
    "key3": "bcd",
    "key4": 456
}

I need to filter out few data from this,

expected output is:

{
    "key1": "abc",
    "key2": 123,
    "key4": 456
}

I am new to JavaScript, any pointers to solve this is greatly appreciated. TIA.