JavaScript if Statement

Written by Swapnil RajaPublished 22 Jul 2026

The JavaScript if statement is used to run a block of code only when a condition is true.

It helps JavaScript make decisions.

Example

javascript

let age = 20;

if (age >= 18) {
  console.log("You are eligible.");
}

In this example, the code inside the if block runs only when age is greater than or equal to 18.

What is an if Statement?

An if statement checks a condition.

If the condition is true, JavaScript runs the code inside the curly braces {}.

If the condition is false, JavaScript skips that code.

PreviousJavaScript Code Blocks NextJavaScript if else Statement

Operator	Meaning
`<code>`>`</code>`	Greater than
`<code>`<`</code>`	Less than
`<code>`>=`</code>`	Greater than or equal to
`<code>`<=`</code>`	Less than or equal to
`<code>`==`</code>`	Equal value
`<code>`===`</code>`	Equal value and equal type
`<code>`!=`</code>`	Not equal
`<code>`!==`</code>`	Not equal value or not equal type

Condition	Meaning
`<code>`age >= 18`</code>`	Age must be 18 or above
`<code>`hasId`</code>`	User must have an ID

Complete Example

html

<!DOCTYPE html>
<html>
<head>
  <title>JavaScript if Statement</title>
</head>
<body>

  <h1>JavaScript if Statement</h1>

  <p id="result"></p>

  <script>
    let userName = "John";
    let age = 21;
    let message = "";

    if (age >= 18) {
      message = userName + " is eligible to vote.";
    }

    document.getElementById("result").innerHTML = message;
  </script>

</body>
</html>

JavaScript if Statement

Example

What is an if Statement?

Syntax

Simple if Statement Example

if Statement with Numbers

if Statement with Strings

if Statement with Boolean Values

Using Comparison Operators with if

Using Logical Operators with if

Complete Example

Try It Yourself

Important Points

Conclusion