select an entry

jq '.jwt'

This will select and print the jwt value from a json object. The -r option is helpful here sometimes as it will print the "raw" value without qoutes or anything.

select multiple fields from an array of objects

jq '.[] | .login, .id'

delete an entry from an array

$ echo '{"hello": "world", "myarray": ["a", "b", "c"]}' | jq
{
  "hello": "world",
  "myarray": [
    "a",
    "b",
    "c"
  ]
}

To remove an element from the array, use the del function with the select function to select a single element:
jq 'del(.myarray[] | select(. == "b"))'

remove quotes from the results

-r or --raw-output