JavaScript Number Min & Max & Safe Values

JavaScript is a widely-used scripting language that is popularly used for creating web applications and client-side functionalities. Numbers are a vital component of JavaScript, and they are commonly used in mathematical calculations, logical operations, and comparisons.

In JavaScript, numbers are represented as 64-bit floating-point numbers. This means that they are stored in memory as binary fractions, with a limited precision of 53 bits. It’s important to note that this can lead to rounding errors in certain situations, as the precision is not infinite.

Number.MAX_VALUE and Number.MIN_VALUE

The Number.MAX_VALUE and Number.MIN_VALUE properties are used to represent the maximum and minimum values that can be stored in a JavaScript number. These values are automatically assigned by the language, based on the IEEE 754 standard for floating-point arithmetic.

The Number.MAX_VALUE property represents the largest positive number that can be represented in JavaScript. It has a value of approximately 1.79e+308. This value is commonly used to check the upper limits of numeric operations in JavaScript.

The Number.MIN_VALUE property, on the other hand, represents the smallest positive number that can be represented in JavaScript. It has a value of approximately 5e-324. This value is used to check the lower limits of numeric operations.

Safe Integer Values

JavaScript also has a concept of safe integer values, which are integers that can be safely represented without any rounding errors. These values are stored as 32-bit integers in memory, and they have a maximum safe value of 2^31 – 1 (or 2147483647) and a minimum safe value of -2^31 (or -2147483648).

Safe integer values are useful when performing bitwise operations and other integer-based calculations. However, it’s important to note that JavaScript does not have a separate data type for integers, so all numeric operations in JavaScript are performed using floating-point numbers.


What happens if I exceed the maximum value of a JavaScript number?

If you try to exceed the maximum value of a JavaScript number, the result will be inexact and may be rounded or truncated. This can lead to unexpected results or errors in your code.

What happens if I try to divide by zero in JavaScript?

If you try to divide by zero in JavaScript, the result will be NaN (Not a Number). This is a special value that indicates an undefined or unrepresentable result.

Can JavaScript handle decimal values?

Yes, JavaScript can handle decimal values using the same 64-bit floating-point representation as other numeric values. However, it’s important to be aware of the limitations of floating-point arithmetic and the potential for rounding errors.

What is the difference between Number.MAX_SAFE_INTEGER and Number.MAX_VALUE?

Number.MAX_SAFE_INTEGER represents the maximum safe integer value that can be safely represented in JavaScript, while Number.MAX_VALUE represents the maximum positive numeric value that can be represented in JavaScript. The two values are not equivalent, as Number.MAX_SAFE_INTEGER is limited to 32-bit integers while Number.MAX_VALUE is a 64-bit floating-point number.


In conclusion, JavaScript numbers are a crucial part of the language and are used for various purposes. Understanding the limits, ranges, and safe integer values of JavaScript numbers is essential for developing robust and accurate JavaScript code. With these concepts in mind, you can ensure that your numeric operations are accurate and error-free.

Code Example:

let x = Number.MAX_VALUE;
let y = Number.MIN_VALUE;
let z = Number.MAX_SAFE_INTEGER;

console.log(x); // Output: 1.7976931348623157e+308
console.log(y); // Output: 5e-324
console.log(z); // Output: 9007199254740991

Similar Posts