A user's recent entries syndicated using the Really Simple Syndication (2.0) XML format. It is available with public entries only at:

http://exampleusername.livejournal.com/data/rss

If you want security-restricted posts included and you have access to view them, you may request the auth-required version of the feed using HTTP Digest auth, using:

http://exampleusername.livejournal.com/data/rss?auth=digest

Other optional feed URL arguments (use &arg=value if the URL already contains a question mark):

A user's recent entries syndicated using the Atom (1.0) XML format. The optional RSS feed arguments can also be used with Atom feeds. Available at the URL with or without auth:

http://exampleusername.livejournal.com/data/atom

http://exampleusername.livejournal.com/data/atom?auth=digest

A user's information page using the Friend of a Friend XML format. Available at the URL:

http://exampleusername.livejournal.com/data/foaf

A list of user's subscribed syndicated feed accounts using the OPML 1.0 XML format. Available at the URL:

http://www.livejournal.com/tools/opml.bml?user=exampleusername

You need to have installed the optional Text::vCard Perl module for this. The remote user's profile information in the vCard format. Available at the URL:

http://www.livejournal.com/tools/vcard.bml

A user's userpic data in a machine-readable (Atom) format. Available at the URL:

http://exampleusername.livejournal.com/data/userpics

Interests of a user or community, in a line separated format. Available at the URL:

http://www.livejournal.com/misc/interestdata.bml?user=exampleusername

The <intid> is the interest ID. The <intcount> is the total number of accounts listing the interest. The <interest> field shows the name of the interest.

An HTTP interface to the S2 style system for downloading a layer or uploading an existing layer. The Content-type value used in server responses and client layer uploads is: application/x-danga-s2-layer. For more information please see the S2 Manual. Available at the URI:

http://www.livejournal.com/interface/s2/layerid

A REST-like interface for pinging LiveJournal's feed crawler to re-fetch an external syndication URL. Do a POST to this URL with a “feed” parameter equal to the URL. Also permitted are multiple feed parameters, if you are not sure the LiveJournal installation is indexing your Atom versus RSS, etc. At most, 3 are currently accepted. A positive acknowledgment from the API does not promise to go and fetch it straightaway. Just that it will be considered. If it would be violating rate-limits, the LiveJournal installation does not have to go and fetch it.

Available at the URL:

http://www.livejournal.com/misc/feedping.bml

Command-line example:

$ curl -d 'feed=http://www.example.com/my.rss' http://www.livejournal.com/misc/feedping.bml
    Thanks! We'll get to it soon.

A line-separated list of usernames which are friends or friends-of a user. Available at the URL:

http://www.livejournal.com/misc/fdata.bml?user=exampleusername

By default fdata.bml returns only personal journals, not communities. You need to pass a different argument for it to return communities:

http://www.livejournal.com/misc/fdata.bml?comm=1&user=communityname

Before the data was cached, creating fdata.bml was an expensive operation, and was not a public interface developers were made aware of. Now the data is cached, it is just for historic reasons that it has not moved into a public SVN repository.

fdata.bml may be considered a best effort type of system. It is not designed to be be effective on users/communities with excessively large groups of friends (say, larger than 2500).

For a live stream of all Six Apart (including LiveJournal.com) posts, see:

http://updates.sixapart.com/