[DOC-12129] base64 encoding/decoding functions in Eventing (Server 7.6.2)

modules/eventing/pages/eventing-language-constructs.adoc

@@ -267,6 +267,7 @@ Eventing Functions support the following built-in functions:
 * <<n1ql_call,`N1QL()`>>
 * <<analytics_call,`ANALYTICS()`>>
 * <<crc64_call,`crc64()`>>
+* <<base64_call,`base64()`>>
 * <<timers_general,`createTimer()` and `cancelTimer()`>>
 * <<curl_call,`curl()`>>
 
@@ -468,6 +469,43 @@ function OnUpdate(doc, meta) {
 }
 ----
 
+[#base64_call]
+=== `base64()`
+
+ifeval::['{page-component-version}' == '7.6'] 
+_(Introduced in Couchbase Server 7.6.2)_ 
+endif::[]
+
+The `base64()` functions let you pack large-dimensional arrays of floats as base64 encoded strings when you use the Eventing Service to generate vector embeddings.
+This encoding process stores and transmits arrays as text, ensuring data integrity and compatibility with text-based systems.
+
+The following `base64()` functions are available:
+
+* `base64Encode()`, which takes a JSON argument and returns a base64 string.
++
+[source,javascript]
+----
+function OnUpdate(doc, meta) {
+    var base_str = base64Encode(doc);
+    /// Code goes here
+}
+----
++
+* `base64Decode()`, which takes a base64 encoded string and returns a value string.
++
+[source,javascript]
+----
+function OnUpdate(doc, meta) {
+    var base_str = base64Decode(doc);
+    /// Code goes here
+}
+----
++
+* `base64Float32ArrayEncode()`, which takes a float32 number array and returns a base64 string.
+* `base64Float32ArrayDecode()`, which takes a base64 encoded string and returns a float32 number array.
+* `base64Float64ArrayEncode()`, which takes a float64 number array and returns a base64 string.
+* `base64Float64ArrayDecode()`, which takes a base64 encoded string and returns a float64 number array.
+
 [#timers_general]
 === `createTimer()` and `cancelTimer()`