node-ldapjs/docs/dn.md

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title: DN API | ldapjs
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---
# ldapjs DN API
This document covers the ldapjs DN API and assumes that you are familiar
with LDAP. If you're not, read the [guide](http://ldapjs.org/guide.html) first.
DNs are LDAP distinguished names, and are composed of a set of RDNs (relative
distinguished names). [RFC2253](http://www.ietf.org/rfc/rfc2253.txt) has the
complete specification, but basically an RDN is an attribute value assertion
with `=` as the seperator, like: `cn=foo` where 'cn' is 'commonName' and 'foo'
is the value. You can have compound RDNs by using the `+` character:
`cn=foo+sn=bar`. As stated above, DNs are a set of RDNs, typically separated
with the `,` character, like: `cn=foo, ou=people, o=example`. This uniquely
identifies an entry in the tree, and is read "bottom up".
# parseDN(dnString)
The `parseDN` API converts a string representation of a DN into an ldapjs DN
object; in most cases this will be handled for you under the covers of the
ldapjs framework, but if you need it, it's there.
var parseDN = require('ldapjs').parseDN;
var dn = parseDN('cn=foo+sn=bar, ou=people, o=example');
console.log(dn.toString());
# DN
The DN object is largely what you'll be interacting with, since all the server
APIs are setup to give you a DN object.
## childOf(dn)
Returns a boolean indicating whether 'this' is a child of the passed in dn. The
`dn` argument can be either a string or a DN.
server.add('o=example', function(req, res, next) {
if (req.dn.childOf('ou=people, o=example')) {
...
} else {
...
}
});
## parentOf(dn)
The inverse of `childOf`; returns a boolean on whether or not `this` is a parent
of the passed in dn. Like `childOf`, can take either a string or a DN.
server.add('o=example', function(req, res, next) {
var dn = parseDN('ou=people, o=example');
if (dn.parentOf(req.dn)) {
...
} else {
...
}
});
## equals(dn)
Returns a boolean indicating whether `this` is equivalent to the passed in `dn`
argument. `dn` can be a string or a DN.
server.add('o=example', function(req, res, next) {
if (req.dn.equals('cn=foo, ou=people, o=example')) {
...
} else {
...
}
});
## parent()
Returns a DN object that is the direct parent of `this`. If there is no parent
this can return `null` (e.g. `parseDN('o=example').parent()` will return null).
## toString()
Returns the string representation of `this`.
server.add('o=example', function(req, res, next) {
console.log(req.dn.toString());
});