One event, four tools

This web flow sends one event stream to four analytics tools at once, with no per-tool mapping. The collector fans a single event out to every destination, and each tool receives it in its own native call shape.

{
  "version": 4,
  "flows": {
    "default": {
      "config": {
        "platform": "web",
        "bundle": {
          "packages": {
            "@walkeros/collector": {},
            "@walkeros/web-source-browser": {},
            "@walkeros/web-destination-gtag": {},
            "@walkeros/web-destination-amplitude": {},
            "@walkeros/web-destination-mixpanel": {},
            "@walkeros/web-destination-posthog": {}
          }
        }
      },
      "sources": {
        "browser": {
          "package": "@walkeros/web-source-browser",
          "config": { "settings": { "pageview": true } }
        }
      },
      "destinations": {
        "ga4": {
          "package": "@walkeros/web-destination-gtag",
          "config": { "settings": { "ga4": { "measurementId": "G-XXXXXX-1" } } }
        },
        "amplitude": {
          "package": "@walkeros/web-destination-amplitude",
          "config": { "settings": { "apiKey": "test-project" } }
        },
        "mixpanel": {
          "package": "@walkeros/web-destination-mixpanel",
          "config": { "settings": { "apiKey": "test-project" } }
        },
        "posthog": {
          "package": "@walkeros/web-destination-posthog",
          "config": { "settings": { "apiKey": "phc_test" } }
        }
      },
      "collector": { "run": true }
    }
  }
}

Run it

Save the config as flow.json and push an order event through the built flow with GA4 mocked. Nothing is sent to any vendor:

npx walkeros push flow.json -e '{"name":"order complete"}' --simulate destination.ga4

You should see:

success: true
  Duration: 42ms

What each tool receives

The collector fans the same event out to all four destinations, and each one forwards it in its own native call (from the packages' examples):

gtag('event', 'order_complete', { send_to: 'G-XXXXXX-1' })
amplitude.track('order complete', {})
mixpanel.track('order complete', {})
posthog.capture('order complete', {})

That is the routing half of the job: one stream, four tools, no per-tool code. The payload half is mapping: per-destination rules reshape the same event into each tool's expected schema, like the full GA4 purchase payload in GA4 ecommerce. Without mapping the name arrives in each tool's native call; with mapping the properties do too.

Next steps

• GA4 ecommerce: Map an order into a full GA4 purchase payload
• Mapping: Transform events per destination