JWT decode shell function

jwt.sh

# Adapted from https://www.pgrs.net/2022/06/02/simple-command-line-function-to-decode-jwts/

jwt() {
  if [ "$#" -gt 0 ]; then
    printf %s "$@" | sed 's/[Bb]earer //' | jq -R 'split(".") |.[0:2] | map(gsub("-"; "+") | gsub("_"; "/") | gsub("%3D"; "=") | @base64d) | map(fromjson)' <<< $1
  else
    sed 's/[Bb]earer //' | jq -R 'split(".") |.[0:2] | map(gsub("-"; "+") | gsub("_"; "/") | gsub("%3D"; "=") | @base64d) | map(fromjson)'
  fi
}