Within the Wolfram Cloud, the Wolfram Language provides rich access to available information about the user or process that has initiated the execution of code, making it convenient to set up location- and user-aware services.

Information about Requests

$EvaluationEnvironment — the origin of the request ("Session", "WebAPI", etc.)

Information about HTTP Web Requests

HTTPRequestData — detailed information about an HTTP request

$UserAgentString — the user agent string from the browser etc. initiating the request

Internet Location Information

$RequesterAddress — IP address making an evaluation request

IPAddress — IP address data

Geographic Location Information »

$GeoLocation — inferred lat-long originating a request

$GeoLocationSource — source of inferred geo location (e.g. "GeoIP", "Mobile", "User")

$GeoLocationCountry  ▪  $GeoLocationCity

GeoIdentify  ▪  GeoNearest  ▪  FindGeoLocation  ▪  GeoDistance  ▪  GeoGraphics  ▪  ...

Country City AdministrativeDivision ...

Date & Time Information »

$TimeZone — deduced time zone originating the request

DateList  ▪  DateString  ▪  DayName  ▪  $DateStringFormat  ▪  AbsoluteTime  ▪  LocalTime  ▪  ...

Language Information

$CharacterEncoding  ▪  $SystemCharacterEncoding  ▪  $Language

LanguageIdentify — identify the language of an input

Language — modern and historical languages of the world

Display Information

$ImageFormattingWidth — deduced width of the requester's display

Information about Authenticated Users

$RequesterWolframID — Wolfram ID (typically, email address) requesting an evaluation

$WolframID — Wolfram ID of the owner of the cloud object being executed

$RequesterWolframUUID  ▪  $WolframUUID

$CloudUserID, $CloudUserUUID — IDs for the user in the current cloud

$CloudAccountName — personal or other name associated with a cloud account

$Username — login name of the user, e.g. on a local machine

$HomeDirectory  ▪  $UserDocumentsDirectory  ▪  $UserBaseDirectory

$UserURLBase — user identification to insert in newly created cloud object URLs

Cloud & Evaluation Information

$CloudEvaluation — whether the evaluation is being done in the cloud

$EvaluationCloudObject — the cloud object containing the code used in this evaluation

$EvaluationCloudBase — base URL of the cloud server doing the evaluation

$CloudBase — base URL of the default server for cloud operations

$CloudVersion — version of the cloud server

Cookie Information »

$Cookies  ▪  FindCookies  ▪  SetCookies  ▪  ...

Providing Metadata & Extended Parameters

AllowedCloudExtraParameters — extra parameters allowed for API calls (e.g. _timeout=...)

AllowedCloudParameterExtensions — extensions to allow for parameters (e.g. x__json=...)

Managing Cloud Content »

Permissions  ▪  CloudLoggingData  ▪  CloudDirectory  ▪  ...

Local Machine Information »

SystemInformation — complete information on a local machine

$MachineName  ▪  $MachineDomains  ▪  $MachineAddresses  ▪  $ProcessorType  ▪  ...