JavaScript .MIN_VALUE

The Number.MIN_VALUE constant represents the smallest positive numeric value that can be represented in JavaScript, which is greater than 0 but very close to it.

Syntax

Number.MIN_VALUE

Parameters:

None

Return value:

A number (5e-324) which is the smallest positive floating-point value representable in JavaScript.

Example 1: Comparing tiny numbers with .MIN_VALUE

This example checks if a number is smaller than JavaScript’s smallest positive value:

const tiny = 1e-324;
console.log(tiny < Number.MIN_VALUE);

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The output of this code is:

true

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This confirms that 1e-324 is smaller than Number.MIN_VALUE, meaning JavaScript treats it as effectively zero.

Example 2: Using .MIN_VALUE in scientific precision checks

This example determines if a number is too small to be considered non-zero in physics simulations:

function isEffectivelyZero(num) {
  return Math.abs(num) < Number.MIN_VALUE;
}

console.log(isEffectivelyZero(1e-325));
console.log(isEffectivelyZero(1e-320));

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The output of this code is:

true
false

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The function detects when a value is smaller than what JavaScript can reliably represent as a non-zero number.

Codebyte Example: Handling rounding errors in financial apps with .MIN_VALUE

This example uses .MIN_VALUE to ignore balances that are too tiny to count as real money:

const balance = 0.0000000000000000000000001;

if (balance < Number.MIN_VALUE) {
  console.log('Balance is effectively zero');
} else {
  console.log('Balance is non-zero');
}

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Frequently asked questions

1. Is Number.MIN_VALUE negative?

No. It is the smallest positive number JavaScript can represent. It is greater than 0.

2. What’s the difference between Number.MIN_VALUE and Number.MIN_SAFE_INTEGER?

MIN_VALUE is the smallest positive float value (5e-324), while MIN_SAFE_INTEGER is the most negative integer that can be accurately represented.

3. Why does dividing Number.MIN_VALUE sometimes return 0?

When a value becomes smaller than what JavaScript can represent, it underflows to 0.