decodes your jwt aka cli version of jwt.io

jwt

#!/bin/sh

SELF=${0##*/}

die() {
  log "$@"
  exit 1
}

log() {
  printf "$SELF: %s\n" "$@" >&2
}

usage() {
  cat <<EOF
usage: $self [--help] <jwt>

Examples:

  $SELF --help

  $SELF "\$someJwt"

  $SELF 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c'

EOF
}

requireCommand() {
  command -v $1 >/dev/null 2>&1 || die "'$1' is required, but not found"
}

requireCommand jq

if [ -t 0 ]; then
  # invoked interactively!
  case "$1" in
    ""|--help|help|-help|-h)
      usage
      exit 0
    ;;
  esac
  jwt="$1"
else
  # not interactive, prolly a jwt being piped through
  # TODO i'm going to be annoyed at myself when i forget this only reads a single line
  read -r jwt;
fi

echo "$jwt" | jq -R 'split(".") | .[0],.[1] | @base64d | fromjson'