Transformations Overview

RudderStack’s Transformations feature lets you write custom functions to implement specific use-cases on your event data, like:

• Filtering or sampling events
• Cleaning or aggregating data
• Data masking or removing sensitive PII to ensure data privacy
• Enriching events by implementing static logic or leveraging an external API
• Using an API to implement specific actions on the events

You can create up to:

• 5 JavaScript transformations in the RudderStack Free plan
• 25 transformations (JavaScript and Python) in the Growth plan
• Unlimited transformations in the Enterprise plan
• Unlimited transformation libraries on all plans

See the RudderStack Plan Comparison guide for the full list of plan-specific limits.

Learn more about transformations in this self-paced product tour:

Key features

• Transformations are easy to build, manage, debug, and reuse.
• Enrich your events in-flight with custom logic before sending them to your destinations.
• Use prebuilt templates to create transformations for specific use-cases by leveraging Templates.
• Write transformations in JavaScript and Python.

RudderStack’s Python transformations feature lets you use custom Python code to transform your source events on the fly. It is especially useful for the data teams that generally deal with Python.

Note that:

• Python transformations are available only for:

  • RudderStack Growth and Enterprise plan.
  • Destinations that support sending events via cloud mode.

• RudderStack supports Python version 3.11 for writing transformations.

• RudderStack supports only some of the built-in Python packages to write transformations. These are datetime, json, math, random, requests, time, and urllib, along with the external package python-dateutil.

• Use transformations across your Event Streams and Reverse ETL pipelines in cloud mode.

Device mode transformations are available only in the Enterprise plan.

• Version control your transformations.
• Create an organization-wide sandbox where your team can store all transformations before publishing them in production.
• Leverage the Transformations API to programmatically manage your transformations.

In this section

See the following guides to learn more about the different Transformations features and their usage: