isemail

validate an email address according to RFCs 5321, 5322, and others

isemail

This first version of isemail is a port of the PHP is_email function by Dominic Sayers.

Future versions will improve upon the current version, optimizing it for efficient usage and DRYing the code.

$ npm install isemail

The tests were pulled from is_email's extensive test suite on October 15, 2013. Many thanks to the contributors!

Run any of the following.

$ mocha
$ npm test
$ make test

remember to npm install!

Determines whether the email is valid or not, for various definitions thereof. Optionally accepts an options object and a callback function. Options may include errorLevel and checkDNS. The callback function will always be called if specified, and the result of the operation supplied as the only parameter to the callback function. If isEmail is not asked to check for the existence of the domain (checkDNS), it will also synchronously return the result of the operation.

Use errorLevel to specify the type of result for isEmail. Passing a false literal will result in a true or false boolean indicating whether the email address is sufficiently defined for use in sending an email. Passing a true literal will result in a more granular numeric status, with zero being a perfectly valid email address. Passing a number will return 0 if the numeric status is below the errorLevel and the numeric status otherwise.

The tldWhitelist option can be either an object lookup table or an array of valid top-level domains. If the email address has a top-level domain that is not in the whitelist, the email will be marked as invalid.

The minDomainAtoms option is an optional positive integer that specifies the minimum number of domain atoms that must be included for the email address to be considered valid. Be careful with the option, as some top-level domains, like io, directly support email addresses.

$ node
> var isEmail = require('isemail');
undefined
> var log = console.log.bind(console, 'result');
undefined
> isEmail('test@iana.org');
true
> isEmail('test@iana.org', log);
result true
true
> isEmail('test@iana.org', {checkDNS: true});
undefined
> isEmail('test@iana.org', {checkDNS: true}, log);
undefined
result true
> isEmail('test@iana.org', {errorLevel: true});
0
> isEmail('test@iana.org', {errorLevel: true}, log);
result 0
0
> isEmail('test@e.com');
true
> isEmail('test@e.com', {checkDNS: true, errorLevel: true}, log);
undefined
result 6
> isEmail('test@e.com', {checkDNS: true, errorLevel: 7}, log);
undefined
result 0
> isEmail('test@e.com', {checkDNS: true, errorLevel: 6}, log);
undefined
result 6

TODO

Add tests for library usage, not just functionality comparisons.

License

BSD License