Sentry Span Streaming for JavaScript

---
name: sentry-span-streaming-js
description: Migrate JavaScript SDK to Sentry span streaming (span-first trace lifecycle). Use when asked to "enable span streaming", "migrate to span streaming", "use traceLifecycle stream", "add spanStreamingIntegration", or switch from transaction-based to streamed span delivery in a JavaScript project.
license: Apache-2.0
category: feature-setup
parent: sentry-feature-setup
disable-model-invocation: true
allowed-tools: Bash, Read, Edit, Write, Grep, Glob
---

> [All Skills](../../SKILL_TREE.md) > [Feature Setup](../sentry-feature-setup/SKILL.md) > Span Streaming (JavaScript)

# Sentry Span Streaming Migration (JavaScript)

Migrate from the default transaction-based trace lifecycle (`static`) to span streaming (`stream`), where spans are sent individually as they complete instead of being batched into a transaction at the end.

This skill covers the JavaScript SDK (Browser, Node.js, Bun, Deno, Cloudflare). For Python, see [Span Streaming (Python)](../sentry-span-streaming-python/SKILL.md).

## Invoke This Skill When

- User asks to "enable span streaming" or "migrate to span streaming" in a JavaScript project
- User wants to switch from transaction-based to streamed span delivery
- User mentions `traceLifecycle`, `spanStreamingIntegration`, or `withStreamedSpan`
- User wants lower latency span delivery or per-span processing
… install to load the full skill