• {symbol} that can be used to declare custom inspect functions.

    In addition to being accessible through util.inspect.custom, this symbol is [registered globally][global symbol registry] and can be accessed in any environment as Symbol.for('nodejs.util.inspect.custom').

    1. const inspect = Symbol.for('nodejs.util.inspect.custom');
    3. class Password {
    4.   constructor(value) {
    5.     this.value = value;
    6.   }
    8.   toString() {
    9.     return 'xxxxxxxx';
    10.   }
    12.   [inspect]() {
    13.     return `Password <${this.toString()}>`;
    14.   }
    15. }
    17. const password = new Password('r0sebud');
    18. console.log(password);
    19. // Prints Password <xxxxxxxx>

    See [Custom inspection functions on Objects][] for more details.