diff --git a/packages/bruno-js/src/sandbox/quickjs/index.js b/packages/bruno-js/src/sandbox/quickjs/index.js
index 9b3330700..a5e1b84df 100644
--- a/packages/bruno-js/src/sandbox/quickjs/index.js
+++ b/packages/bruno-js/src/sandbox/quickjs/index.js
@@ -15,10 +15,9 @@ const { marshallToVm } = require('./utils');
 const addCryptoUtilsShimToContext = require('./shims/lib/crypto-utils');
 const { wrapScriptInClosure, SANDBOX } = require('../../utils/sandbox');
 
-let QuickJSSyncContext;
+let QuickJSModule;
 const loader = memoizePromiseFactory(() => newQuickJSWASMModule());
-const getContext = (opts) => loader().then((mod) => (QuickJSSyncContext = mod.newContext(opts)));
-getContext();
+loader().then((mod) => (QuickJSModule = mod));
 
 const toNumber = (value) => {
   const num = Number(value);
@@ -58,9 +57,8 @@ const executeQuickJsVm = ({ script: externalScript, context: externalContext, sc
     externalScript = removeQuotes(externalScript);
   }
 
-  const vm = QuickJSSyncContext;
-
   try {
+    const vm = QuickJSModule.newContext();
     const { bru, req, res, ...variables } = externalContext;
 
     bru && addBruShimToContext(vm, bru);
@@ -98,7 +96,7 @@ const executeQuickJsVmAsync = async ({ script: externalScript, context: external
   externalScript = externalScript?.trim();
 
   try {
-    const module = await newQuickJSWASMModule();
+    const module = await loader();
     const vm = module.newContext();
 
     // add crypto utilities required by the crypto-js library in bundledCode
@@ -144,5 +142,6 @@ const executeQuickJsVmAsync = async ({ script: externalScript, context: external
 
 module.exports = {
   executeQuickJsVm,
-  executeQuickJsVmAsync
+  executeQuickJsVmAsync,
+  loader
 };
diff --git a/packages/bruno-js/tests/runtime.spec.js b/packages/bruno-js/tests/runtime.spec.js
index 019b053f5..4b00b4391 100644
--- a/packages/bruno-js/tests/runtime.spec.js
+++ b/packages/bruno-js/tests/runtime.spec.js
@@ -1,9 +1,10 @@
-const { describe, it, expect } = require('@jest/globals');
+const { describe, it, expect, beforeAll } = require('@jest/globals');
 const TestRuntime = require('../src/runtime/test-runtime');
 const ScriptRuntime = require('../src/runtime/script-runtime');
 const AssertRuntime = require('../src/runtime/assert-runtime');
 const Bru = require('../src/bru');
 const VarsRuntime = require('../src/runtime/vars-runtime');
+const { loader: quickJsLoader } = require('../src/sandbox/quickjs');
 
 describe('runtime', () => {
   describe('test-runtime', () => {
@@ -261,6 +262,10 @@ describe('runtime', () => {
   });
 
   describe('assert-runtime', () => {
+    beforeAll(async () => {
+      await quickJsLoader();
+    });
+
     const baseRequest = {
       method: 'GET',
       url: 'http://localhost:3000/',
@@ -275,11 +280,81 @@ describe('runtime', () => {
       headers: {}
     });
 
-    const runAssertions = (assertions, response, runtime = 'nodevm') => {
+    const runAssertions = (assertions, response, runtime = 'nodevm', runtimeVariables = {}) => {
       const assertRuntime = new AssertRuntime({ runtime });
-      return assertRuntime.runAssertions(assertions, { ...baseRequest }, response, {}, {}, process.env);
+      return assertRuntime.runAssertions(assertions, { ...baseRequest }, response, {}, runtimeVariables, process.env);
     };
 
+    // Ensures each QuickJS evaluation gets a fresh context
+    describe('quickjs context isolation across iterations', () => {
+      const ITERATION_COUNT = 350;
+
+      it('should return correct res.status on every iteration', () => {
+        for (let i = 0; i < ITERATION_COUNT; i++) {
+          const status = 200 + i;
+          const results = runAssertions(
+            [{ name: 'res.status', value: `eq ${status}`, enabled: true }],
+            { status, statusText: 'OK', data: {}, headers: {} },
+            'quickjs'
+          );
+          expect(results[0].status).toBe('pass');
+        }
+      });
+
+      it('should return correct res.body values on every iteration', () => {
+        for (let i = 0; i < ITERATION_COUNT; i++) {
+          const results = runAssertions(
+            [{ name: 'res.body.id', value: `eq ${i}`, enabled: true }],
+            { status: 200, statusText: 'OK', data: { id: i }, headers: {} },
+            'quickjs'
+          );
+          expect(results[0].status).toBe('pass');
+        }
+      });
+
+      it('should not return stale data from a previous iteration', () => {
+        // First call with status 200
+        runAssertions(
+          [{ name: 'res.status', value: 'eq 200', enabled: true }],
+          { status: 200, statusText: 'OK', data: { token: 'bearer_abc' }, headers: { authorization: 'bearer xyz' } },
+          'quickjs'
+        );
+
+        // Second call with status 404 — must not return 200 or any data from previous call
+        const results = runAssertions(
+          [
+            { name: 'res.status', value: 'eq 404', enabled: true },
+            { name: 'res.body.error', value: 'eq not_found', enabled: true }
+          ],
+          { status: 404, statusText: 'Not Found', data: { error: 'not_found' }, headers: {} },
+          'quickjs'
+        );
+
+        expect(results[0].status).toBe('pass');
+        expect(results[1].status).toBe('pass');
+      });
+
+      it('should not persist runtime variables from a previous call', () => {
+        // First call with runtime variable token = "one"
+        const results1 = runAssertions(
+          [{ name: 'token', value: 'eq one', enabled: true }],
+          { status: 200, statusText: 'OK', data: {}, headers: {} },
+          'quickjs',
+          { token: 'one' }
+        );
+        expect(results1[0].status).toBe('pass');
+
+        // Second call without token
+        const results2 = runAssertions(
+          [{ name: 'token', value: 'eq one', enabled: true }],
+          { status: 200, statusText: 'OK', data: {}, headers: {} },
+          'quickjs'
+        );
+        // Must fail — token should not exist in a fresh context
+        expect(results2[0].status).toBe('fail');
+      });
+    });
+
     describe('isJson', () => {
       it('should pass for a plain object', () => {
         const results = runAssertions(