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    String.prototype.toUpperCase()

    Summary

    The toUpperCase() method returns the calling string value converted to uppercase.

    Syntax

    str.toUpperCase()

    Description

    The toUpperCase() method returns the value of the string converted to uppercase. toUpperCase() does not affect the value of the string itself.

    Examples

    Example: Using toUpperCase()

    console.log('alphabet'.toUpperCase()); // 'ALPHABET'
    

    Specifications

    Specification Status Comment
    ECMAScript 1st Edition. Standard Initial definition. Implemented in JavaScript 1.0.
    ECMAScript 5.1 (ECMA-262)
    The definition of 'String.prototype.toUpperCase' in that specification.
    Standard  
    ECMAScript 2015 (6th Edition, ECMA-262)
    The definition of 'String.prototype.toUpperCase' in that specification.
    Standard  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

    See also

    Document Tags and Contributors

    Contributors to this page: Sheppy, fscholz, evilpie, Brettz9, Ptak82, ziyunfei, Mgjbot, Maian, Dria, Mingun
    Last updated by: Mingun,
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