Core Library

The SSJS Core library provides object-oriented APIs for Data Extensions, Subscribers, Lists, Email sends, HTTP requests, and more. Load with Platform.Load("core", "1.1.5").

The Core library is loaded with Platform.Load("core", "1.1.5") and gives you access to a set of powerful object-oriented namespaces. Unlike Platform.Function.*, Core library objects use a more JavaScript-idiomatic dot-notation with method chaining.

You must call Platform.Load("core", "1.1.5") before using any Core library object. Place it at the very top of your first <script runat="server"> block.

Platform.Load("core", "1.1.5");

Core Library Objects

Object	Description
DataExtension	Initialize and work with Data Extensions
DataExtension.Rows	Retrieve, Add, Update, Remove rows
Subscriber	Manage All Subscribers list entries
List	Work with publication lists
Email	Send emails programmatically
TriggeredSend	Initiate triggered send definitions

HTTP utilities are also part of the Core library but documented separately:

Object	Description
HTTP	Simple HTTP GET and POST
Script.Util	Advanced HTTP with request objects

---

When to Use Core vs Platform.Function

The Core library and Platform.Function.* both interact with SFMC data, but have different strengths:

	Core Library	Platform.Function
DE operations	Object-based (Init → Rows.Retrieve)	Functional (Lookup, InsertData)
Subscriber	Rich object model	No direct equivalent
Performance (large datasets)	Better for bulk	Better for single lookups
CloudPage retrieve	Works correctly	DataExtension.Rows.Retrieve() bug
Error handling	Exceptions on failure	Returns 0/null

See Platform.Function vs Core Library for a detailed comparison.