# Experiment NodeJS SDK Stream Flag Config Updates — Amplitude Changelog

NodeJS server side SDK users can now listen for flag config updates and receive them within 1 second, instead of continuously polling for changes.

Source: https://amplitude.com/en-us/releases/experiment-nodejs-sdk-stream-flag-config-updates

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[Changelog](/releases)/Experiment NodeJS SDK Stream Flag Config Updates

ExperimentMar 18, 2024

# Experiment NodeJS SDK Stream Flag Config Updates

NodeJS server side SDK users can now listen for flag config updates and receive them within 1 second, instead of continuously polling for changes.

## What it is

**Description:** Customers who use the NodeJS server-side SDK can now listen for flag config updates and receive them generally within 1 second instead of continuously polling for flag config changes.

**Why:** Currently, customers’ servers have to keep polling at an interval to receive the newest set of flags.

Now, we can push updates to the SDK and customers’ servers can serve the freshest flag configs right after they make changes in Experiment. They are able to perform use cases such as a kill switch to stop or modify an experiment instantly.

**Where:** In Node JS server side Experiment SDK. Requires opting in using `streamUpdates` configuration.

**Useful Resources:** <https://www.docs.developers.amplitude.com/experiment/sdks/nodejs-sdk/#initialize-local>

Release details

- Release ID

  experiment-nodejs-sdk-stream-flag-config-updates

- Shipped

  Mar 18, 2024

- Area

  Experiment

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