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Truthy In JavaScript

Last Updated : 23 Jul, 2025

In JavaScript, truthy values are the values that are evaluated to be true when used in a Boolean context, such as in conditional statements or logical operations.

If you’ve ever wondered what JavaScript considers “true,” here’s the simple answer: any value that is not explicitly falsy (like false, 0, null, undefined, NaN, or an empty string "") is considered truthy. This means numbers (except 0), non-empty strings, objects, arrays, functions, and even some quirky values like "0" are all truthy.

List of Truthy Values in JavaScript

Here’s a detailed look at the most common truthy values in JavaScript:

Non-zero Numbers

Any number, whether positive or negative, is truthy.


Output
This is truthy!
This is also truthy!

Non-Empty Strings

Any string with at least one character is truthy, including strings containing whitespace.


Output
Non-empty strings are truthy!
Even whitespace is truthy!

Objects

All objects (including empty objects {}) are truthy.


Output
An empty object is truthy!
Objects with properties are truthy!

Arrays

Similarly, all arrays (including empty arrays []) are truthy.


Output
An empty array is truthy!
Non-empty arrays are truthy!

Functions

Functions are always truthy, even if they do nothing.


Output
Functions are truthy!

Dates

All JavaScript Date objects are truthy, regardless of their validity.


Output
Dates are truthy!

Non-Zero BigInt Values

All BigInt values, except 0n, are truthy.


Output
BigInt is truthy!

Symbols

All Symbol values are truthy.


Output
Symbols are truthy!

To better understand how truthy values work in JavaScript, Let's see an example


Output
1 is truthy.
-1 is truthy.
hello is truthy.
 is truthy.
[object Object] is truthy.
 is truthy.
function () { } is truthy.
Mon Dec 09 2024 08:00:36 GMT+0000 (Coordinated Universal Time) is truthy.
Sym...

Why Truthy Values Matter?

Understanding truthy values helps you write concise and readable code. For example:

Providing default values


Output
Guest

Checking for existence


Truthy values in JavaScript include any value that isn’t explicitly falsy. This simple rule makes JavaScript flexible but also requires attention to detail to avoid unexpected behavior. Remember, non-zero numbers, non-empty strings, objects, arrays, functions, symbols, and dates are all truthy—making JavaScript both powerful and occasionally quirky.

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