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Function: key llCreateKeyValue( string k, string v );

Start an asynchronous transaction to create a key-value pair associated with the script's Experience using the given key (k) and value (v).
Returns a handle (a key) that can be used to identify the corresponding dataserver event to determine if this command succeeded or failed.

• string k The key for the key-value pair
• string v The value for the key-value pair. Maximum 2047 characters, or 4095 if using Mono.

If the key already exists the dataserver will return a failure along with the error XP_ERROR_STORAGE_EXCEPTION.

As of Jan 1, 2016 maximum bytes is 1011 for key and 4095 for value for both LSO and Mono scripts.

For this function to work, the script must be compiled into an Experience.



The dataserver callback parameters are:

  • A key containing the handle returned from llCreateKeyValue
  • A string containing a comma-delimited list (cdl). llDumpList2String([ integer success ] + components);
String Components
• integer success A boolean specifying if the transaction succeeded (1) or not (0).
• integer error An XP_ERROR_* flag that describes why the operation failed.
• string value The value for the key-value pair. Maximum 2047 characters, or 4095 if using Mono. Note! This value may contain commas.


  • If you recompile a script that was previously associated with an Experience but do so with a client that lacks the ability to compile scripts into an experience the script will loose the associated Experience.
  • If this function returns an XP_ERROR_STORAGE_EXCEPTION, subsequent attempts to create the same KVP key may also fail, even if it appears that no key has been created. For that reason, it may be preferable to use llUpdateKeyValue, which will overwrite any existing value or will create a new KVP key if none exists with that name.
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key trans;
    touch_start(integer total_number)
        trans = llCreateKeyValue("FOO", "BAR");
    dataserver(key t, string value)
        if (t == trans)
            // our llCreateKeyValue transaction is done
            integer result = (integer)llGetSubString(value, 0, 0);
            if (result == 1)
                // the key-value pair was successfully created
                llSay(0, "New key-value pair was created");
                // the key-value pair was not created
                integer error = (integer)(llGetSubString(value, 2, -1));
                llSay(0, "Key-value failed to create: " + llGetExperienceErrorMessage(error));



For a script to be associated with an Experience...

  • It must be compiled with a client that is Experience aware,
  • The "Use Experience" checkbox must be checked,
  • And one of the users Experience keys selected.
KBcaution.png Important: Not all TPVs have this functionality.

Deep Notes

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function key llCreateKeyValue( string k, string v );