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The Boolean.prototype property represents the prototype for the Boolean constructor.

Property attributes of Boolean.prototype
Writable no
Enumerable no
Configurable no


Boolean instances inherit from Boolean.prototype. You can use the constructor's prototype object to add properties or methods to all Boolean instances.


Returns the function that created an instance's prototype. This is the Boolean function by default.


Returns a string containing the source of the Boolean object; you can use this string to create an equivalent object. Overrides the Object.prototype.toSource() method.
Returns a string of either "true" or "false" depending upon the value of the object. Overrides the Object.prototype.toString() method.
Returns the primitive value of the Boolean object. Overrides the Object.prototype.valueOf() method.


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

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

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)

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