Comment by nh23423fefe

    <input.json  jq -S  -r '(first | keys) , (.[]| [.[]]) | @tsv'
    <input.json  # redir
    jq
    -S           # sort
    -r           # raw string out
    '
    (first | keys) # header
    ,              # comma is generator
    (.[] |           # loop input array and bind to .
    [                # construct array
     .[]             # with items being the array of values of the bound object
     ])           
     | @tsv'        # generator binds the above array to . and renders to tsv