JavaScript Number Methods and Properties – Complete List with Examples

Static methods (Number.isInteger()) test or parse values; instance methods (price.toFixed(2)) format a number as a string. All numbers are 64-bit floats, which is why 0.1 + 0.2 isn't exactly 0.3.

Name	Description	Since
`Number.isInteger()`	Return true if a value is a number with no fractional part. Strings aren't converted, so Number.isInteger("5") is false.	ES2015
`Number.isSafeInteger()`	Return true if a value is an integer that can be represented exactly, between -(2^53 - 1) and 2^53 - 1.	ES2015
`Number.isFinite()`	Return true if a value is a finite number. Unlike the global isFinite(), it doesn't convert strings.	ES2015
`Number.isNaN()`	Return true only if a value is the number NaN. Unlike the global isNaN(), it doesn't convert strings first.	ES2015
`Number.parseFloat()`	Parse a decimal number from the start of a string, ignoring trailing text. Same as the global parseFloat().	ES2015
`Number.parseInt()`	Parse an integer from the start of a string in a given base (radix). Always pass the radix, usually 10.	ES2015
`Number.MAX_SAFE_INTEGER`	The largest integer JavaScript numbers can represent exactly: 2^53 - 1, or 9,007,199,254,740,991.	ES2015
`Number.EPSILON`	The smallest difference between 1 and the next representable number, used as a tolerance when comparing floats.	ES2015
`number.toFixed()`	Format a number with a fixed number of decimal places, returned as a string. Rounds, but floating-point quirks apply.	ES3
`number.toPrecision()`	Format a number to a given number of significant digits, using exponential notation when needed.	ES3
`number.toString()`	Convert a number to a string, optionally in another base such as 2 (binary) or 16 (hexadecimal).	ES1
`number.toLocaleString()`	Format a number for display using locale rules: thousands separators, decimals, currency and percentages.	ES3

Name

Description

Since

Number.isInteger()

Return true if a value is a number with no fractional part. Strings aren't converted, so Number.isInteger("5") is false.

ES2015

Number.isSafeInteger()

Return true if a value is an integer that can be represented exactly, between -(2^53 - 1) and 2^53 - 1.

ES2015

Number.isFinite()

Return true if a value is a finite number. Unlike the global isFinite(), it doesn't convert strings.

ES2015

Number.isNaN()

Return true only if a value is the number NaN. Unlike the global isNaN(), it doesn't convert strings first.

ES2015

Number.parseFloat()

Parse a decimal number from the start of a string, ignoring trailing text. Same as the global parseFloat().

ES2015

Number.parseInt()

Parse an integer from the start of a string in a given base (radix). Always pass the radix, usually 10.

ES2015

Number.MAX_SAFE_INTEGER

The largest integer JavaScript numbers can represent exactly: 2^53 - 1, or 9,007,199,254,740,991.

ES2015

Number.EPSILON

The smallest difference between 1 and the next representable number, used as a tolerance when comparing floats.

ES2015

number.toFixed()

Format a number with a fixed number of decimal places, returned as a string. Rounds, but floating-point quirks apply.

ES3

number.toPrecision()

Format a number to a given number of significant digits, using exponential notation when needed.

ES3

number.toString()

Convert a number to a string, optionally in another base such as 2 (binary) or 16 (hexadecimal).

ES1

number.toLocaleString()

Format a number for display using locale rules: thousands separators, decimals, currency and percentages.

ES3