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    3.2.0 • Public • Published


    boolean converts lots of things to boolean.


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    Version npm
    Dependencies David
    Dev dependencies David
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    License GitHub


    $ npm install boolean

    Quick start

    First you need to add a reference to boolean in your application:

    const { boolean, isBooleanable } = require('boolean');

    If you use TypeScript, use the following code instead:

    import { boolean, isBooleanable } from 'boolean';

    To verify a value for its boolean value, call the boolean function and provide the value in question as parameter:

    console.log(boolean('true')); // => true

    The boolean function considers the following values to be equivalent to true:

    • true (boolean)
    • 'true' (string)
    • 'TRUE' (string)
    • 't' (string)
    • 'T' (string)
    • 'yes' (string)
    • 'YES' (string)
    • 'y' (string)
    • 'Y' (string)
    • 'on' (string)
    • 'ON' (string)
    • '1' (string)
    • 1 (number)

    In addition to the primitive types mentioned above, boolean also supports their object wrappers Boolean, String, and Number.

    Please note that if you provide a string or a String object, it will be trimmed.

    All other values, including undefined and null are considered to be false.

    Figuring out whether a value can be considered to be boolean

    From time to time, you may not want to directly convert a value to its boolean equivalent, but explicitly check whether it looks like a boolean. E.g., although boolean('F') returns false, the string F at least looks like a boolean, in contrast to something such as 123 (for which boolean(123) would also return false).

    To figure out whether a value can be considered to be a boolean, use the isBooleanable function:

    console.log(isBooleanable('true')); // => true

    The isBooleanable function considers all of the above mentioned values to be reasonable boolean values, and additionally, also the following ones:

    • false (boolean)
    • 'false' (string)
    • 'FALSE' (string)
    • 'f' (string)
    • 'F' (string)
    • 'no' (string)
    • 'NO' (string)
    • 'n' (string)
    • 'N' (string)
    • 'off' (string)
    • 'OFF' (string)
    • '0' (string)
    • 0 (number)

    Running quality assurance

    To run quality assurance for this module use roboter:

    $ npx roboter


    npm i boolean

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