This is a new technology, part of the ECMAScript 2015 (ES6) standard .
This technology's specification has been finalized, but check the compatibility table for usage and implementation status in various browsers.

The Number.parseInt() method parses a string argument and returns an integer of the specified radix or base.


Number.parseInt(string[, radix])


The value to parse. If string is not a string, then it is converted to one. Leading whitespace in the string is ignored.
An integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the above mentioned string. Specify 10 for the decimal numeral system commonly used by humans. Always specify this parameter to eliminate reader confusion and to guarantee predictable behavior. Different implementations produce different results when a radix is not specified.


This method is completely the same function with the global parseInt() function:

Number.parseInt === parseInt; // true

and is part of ECMAScript 6 (its purpose is modularization of globals). Please see parseInt() for more details and examples.


Number.parseInt = parseInt;


Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Number.parseInt' in that specification.
Standard Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 25 (25) Not supported (Yes) Not supported
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support Not supported 25 (25) Not supported Not supported Not supported

See also

Document Tags and Contributors

Last updated by: fscholz,