diff --git a/.eslintrc.js b/.eslintrc.js
index a9fb5f421af5..53944e16d9dc 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -21,6 +21,7 @@ module.exports = {
     'examples/**',
     'test/manual/**',
     'types/**',
+    'scripts/*.js',
   ],
   reportUnusedDisableDirectives: true,
   overrides: [
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ce139e9e7787..299ed59cd220 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1035,6 +1035,15 @@ jobs:
           overwrite: true
           retention-days: 7
 
+      - name: Upload E2E Test Event Dumps
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: playwright-event-dumps-job_e2e_playwright_tests-${{ matrix.test-application }}
+          path: dev-packages/e2e-tests/test-applications/${{ matrix.test-application }}/event-dumps
+          overwrite: true
+          retention-days: 7
+
       - name: Upload test results to Codecov
         if: cancelled() == false
         continue-on-error: true
diff --git a/dev-packages/e2e-tests/test-applications/nextjs-15/.gitignore b/dev-packages/e2e-tests/test-applications/nextjs-15/.gitignore
index e799cc33c4e7..ebdbfc025b6a 100644
--- a/dev-packages/e2e-tests/test-applications/nextjs-15/.gitignore
+++ b/dev-packages/e2e-tests/test-applications/nextjs-15/.gitignore
@@ -43,3 +43,4 @@ next-env.d.ts
 .vscode
 
 test-results
+event-dumps
diff --git a/dev-packages/e2e-tests/test-applications/nextjs-15/next-env.d.ts b/dev-packages/e2e-tests/test-applications/nextjs-15/next-env.d.ts
index 4f11a03dc6cc..40c3d68096c2 100644
--- a/dev-packages/e2e-tests/test-applications/nextjs-15/next-env.d.ts
+++ b/dev-packages/e2e-tests/test-applications/nextjs-15/next-env.d.ts
@@ -2,4 +2,4 @@
 /// <reference types="next/image-types/global" />
 
 // NOTE: This file should not be edited
-// see https://nextjs.org/docs/basic-features/typescript for more information.
+// see https://nextjs.org/docs/app/building-your-application/configuring/typescript for more information.
diff --git a/dev-packages/e2e-tests/test-applications/nextjs-15/start-event-proxy.mjs b/dev-packages/e2e-tests/test-applications/nextjs-15/start-event-proxy.mjs
index 90d736790faa..959b40d253e8 100644
--- a/dev-packages/e2e-tests/test-applications/nextjs-15/start-event-proxy.mjs
+++ b/dev-packages/e2e-tests/test-applications/nextjs-15/start-event-proxy.mjs
@@ -1,6 +1,14 @@
+import * as fs from 'fs';
+import * as path from 'path';
 import { startEventProxyServer } from '@sentry-internal/test-utils';
 
+const packageJson = JSON.parse(fs.readFileSync(path.join(process.cwd(), 'package.json')));
+
 startEventProxyServer({
   port: 3031,
   proxyServerName: 'nextjs-15',
+  envelopeDumpPath: path.join(
+    process.cwd(),
+    `event-dumps/next-${packageJson.dependencies.next}-${process.env.TEST_ENV}.dump`,
+  ),
 });
diff --git a/dev-packages/test-utils/src/event-proxy-server.ts b/dev-packages/test-utils/src/event-proxy-server.ts
index 17922a4f90aa..448dd6e34ef0 100644
--- a/dev-packages/test-utils/src/event-proxy-server.ts
+++ b/dev-packages/test-utils/src/event-proxy-server.ts
@@ -17,6 +17,8 @@ interface EventProxyServerOptions {
   port: number;
   /** The name for the proxy server used for referencing it with listener functions */
   proxyServerName: string;
+  /** A path to optionally output all Envelopes to. Can be used to compare event payloads before and after changes. */
+  envelopeDumpPath?: string;
 }
 
 interface SentryRequestCallbackData {
@@ -167,6 +169,10 @@ export async function startProxyServer(
  * option to this server (like this `tunnel: http://localhost:${port option}/`).
  */
 export async function startEventProxyServer(options: EventProxyServerOptions): Promise<void> {
+  if (options.envelopeDumpPath) {
+    await fs.promises.mkdir(path.dirname(path.resolve(options.envelopeDumpPath)), { recursive: true });
+  }
+
   await startProxyServer(options, async (eventCallbackListeners, proxyRequest, proxyRequestBody, eventBuffer) => {
     const data: SentryRequestCallbackData = {
       envelope: parseEnvelope(proxyRequestBody),
@@ -183,6 +189,10 @@ export async function startEventProxyServer(options: EventProxyServerOptions): P
       listener(dataString);
     });
 
+    if (options.envelopeDumpPath) {
+      fs.appendFileSync(path.resolve(options.envelopeDumpPath), `${JSON.stringify(data.envelope)}\n`, 'utf-8');
+    }
+
     return [
       200,
       '{}',
diff --git a/scripts/normalize-e2e-test-dump-transaction-events.js b/scripts/normalize-e2e-test-dump-transaction-events.js
new file mode 100644
index 000000000000..ba06a63fa020
--- /dev/null
+++ b/scripts/normalize-e2e-test-dump-transaction-events.js
@@ -0,0 +1,109 @@
+/* eslint-disable no-console */
+
+const fs = require('fs');
+const path = require('path');
+
+if (process.argv.length < 4) {
+  throw new Error('Please provide an input and output file path as an argument.');
+}
+
+const resolvedInputPath = path.resolve(process.argv[2]);
+const resolvedOutputPath = path.resolve(process.argv[3]);
+
+const fileContents = fs.readFileSync(resolvedInputPath, 'utf8');
+
+const transactionNodes = [];
+
+fileContents.split('\n').forEach(serializedEnvelope => {
+  let envelope;
+  try {
+    envelope = JSON.parse(serializedEnvelope);
+  } catch (e) {
+    return;
+    // noop
+  }
+
+  const envelopeItems = envelope[1];
+
+  envelopeItems.forEach(([envelopeItemHeader, transaction]) => {
+    if (envelopeItemHeader.type === 'transaction') {
+      const rootNode = {
+        runtime: transaction.contexts.runtime?.name,
+        op: transaction.contexts.trace.op,
+        name: transaction.transaction,
+        children: [],
+      };
+
+      const spanMap = new Map();
+      spanMap.set(transaction.contexts.trace.span_id, rootNode);
+
+      transaction.spans.forEach(span => {
+        const node = {
+          op: span.data['sentry.op'],
+          name: span.description,
+          parent_span_id: span.parent_span_id,
+          children: [],
+        };
+        spanMap.set(span.span_id, node);
+      });
+
+      transaction.spans.forEach(span => {
+        const node = spanMap.get(span.span_id);
+        if (node && node.parent_span_id) {
+          const parentNode = spanMap.get(node.parent_span_id);
+          parentNode.children.push(node);
+        }
+      });
+
+      transactionNodes.push(rootNode);
+    }
+  });
+});
+
+const output = transactionNodes
+  .sort((a, b) => {
+    const aSerialized = serializeNode(a);
+    const bSerialized = serializeNode(b);
+    if (aSerialized < bSerialized) {
+      return -1;
+    } else if (aSerialized > bSerialized) {
+      return 1;
+    } else {
+      return 0;
+    }
+  })
+  .map(node => buildDeterministicStringFromNode(node))
+  .join('\n\n-----------------------\n\n');
+
+fs.writeFileSync(resolvedOutputPath, output, 'utf-8');
+
+// ------- utility fns ----------
+
+function buildDeterministicStringFromNode(node, depth = 0) {
+  const mainParts = [];
+  if (node.runtime) {
+    mainParts.push(`(${node.runtime})`);
+  }
+  mainParts.push(`${node.op ?? 'default'} -`);
+  mainParts.push(node.name);
+  const main = mainParts.join(' ');
+  const children = node.children
+    .sort((a, b) => {
+      const aSerialized = serializeNode(a);
+      const bSerialized = serializeNode(b);
+      if (aSerialized < bSerialized) {
+        return -1;
+      } else if (aSerialized > bSerialized) {
+        return 1;
+      } else {
+        return 0;
+      }
+    })
+    .map(child => '\n' + buildDeterministicStringFromNode(child, depth + 1))
+    .join('');
+  return `${main}${children}`.split('\n').join('\n  ');
+}
+
+function serializeNode(node) {
+  return [node.op, node.name, node.runtime].join('---');
+}