Identify a User


FS.identify(uid, userVars?)

Each time a page loads for a user you can identify, you'll want to call the FS.identify function to associate your own application-specific id with the active user.


uidA string containing your unique identifier for the current user.
userVarsA JSON object with key/value pairs that provides additional information about your user (optional).


FullStory doesn't let you change the identity of a user once they have been assigned a unique user ID using FS.identify. If you attempt to change the user id of an identified user, FullStory will recognize the new user ID and automatically split the session into a new session.


  • Sustained calls are limited to 12 calls per minute, with a burst limit of 5 calls per second.

Additional Information