diff --git a/packages/bruno-app/src/utils/codemirror/autocomplete.js b/packages/bruno-app/src/utils/codemirror/autocomplete.js
index ed61a0880c8..1f672ae8d83 100644
--- a/packages/bruno-app/src/utils/codemirror/autocomplete.js
+++ b/packages/bruno-app/src/utils/codemirror/autocomplete.js
@@ -43,7 +43,6 @@ const STATIC_API_HINTS = {
     'req.headerList.get(name)',
     'req.headerList.one(name)',
     'req.headerList.all()',
-    'req.headerList.idx(index)',
     'req.headerList.count()',
     'req.headerList.has(name)',
     'req.headerList.has(name, value)',
@@ -88,7 +87,6 @@ const STATIC_API_HINTS = {
     'res.headerList.get(name)',
     'res.headerList.one(name)',
     'res.headerList.all()',
-    'res.headerList.idx(index)',
     'res.headerList.count()',
     'res.headerList.has(name)',
     'res.headerList.has(name, value)',
diff --git a/packages/bruno-converters/src/postman/postman-translations.js b/packages/bruno-converters/src/postman/postman-translations.js
index 1e96c2e9b42..0482aaae8cf 100644
--- a/packages/bruno-converters/src/postman/postman-translations.js
+++ b/packages/bruno-converters/src/postman/postman-translations.js
@@ -34,8 +34,48 @@ const replacements = {
   'pm\\.environment\\.toObject\\(': 'bru.getAllEnvVars(',
   'pm\\.environment\\.clear\\(': 'bru.deleteAllEnvVars(',
   'pm\\.variables\\.toObject\\(': 'bru.getAllVars(',
+  // Request header PropertyList methods
   'pm\\.request\\.headers\\.remove\\(': 'req.deleteHeader(',
+  'pm\\.request\\.headers\\.get\\(': 'req.headerList.get(',
+  'pm\\.request\\.headers\\.has\\(': 'req.headerList.has(',
+  'pm\\.request\\.headers\\.one\\(': 'req.headerList.one(',
+  'pm\\.request\\.headers\\.all\\(': 'req.headerList.all(',
+  'pm\\.request\\.headers\\.count\\(': 'req.headerList.count(',
+  'pm\\.request\\.headers\\.indexOf\\(': 'req.headerList.indexOf(',
+  'pm\\.request\\.headers\\.find\\(': 'req.headerList.find(',
+  'pm\\.request\\.headers\\.filter\\(': 'req.headerList.filter(',
+  'pm\\.request\\.headers\\.each\\(': 'req.headerList.forEach(',
+  'pm\\.request\\.headers\\.map\\(': 'req.headerList.map(',
+  'pm\\.request\\.headers\\.reduce\\(': 'req.headerList.reduce(',
+  'pm\\.request\\.headers\\.toObject\\(': 'req.headerList.toObject(',
+  'pm\\.request\\.headers\\.clear\\(': 'req.headerList.clear(',
+  'pm\\.request\\.headers\\.add\\(': 'req.headerList.append(',
+  'pm\\.request\\.headers\\.upsert\\(': 'req.headerList.set(',
+  'pm\\.request\\.headers\\.toString\\(': 'req.headerList.toString(',
+  'pm\\.request\\.headers\\.toJSON\\(': 'req.headerList.toJSON(',
+  'pm\\.request\\.headers\\.populate\\(': 'req.headerList.populate(',
+  'pm\\.request\\.headers\\.repopulate\\(': 'req.headerList.repopulate(',
+  'pm\\.request\\.headers\\.assimilate\\(': 'req.headerList.assimilate(',
+  // Lossy: positional inserts map to append (position irrelevant for headers)
+  // Note: regex can't drop the second arg, so it passes through as-is
+  'pm\\.request\\.headers\\.prepend\\(': 'req.headerList.append(',
+  'pm\\.request\\.headers\\.insert\\(': 'req.headerList.append(',
+  'pm\\.request\\.headers\\.insertAfter\\(': 'req.headerList.append(',
+  // Response header PropertyList methods
   'pm\\.response\\.headers\\.get\\(': 'res.getHeader(',
+  'pm\\.response\\.headers\\.has\\(': 'res.headerList.has(',
+  'pm\\.response\\.headers\\.one\\(': 'res.headerList.one(',
+  'pm\\.response\\.headers\\.all\\(': 'res.headerList.all(',
+  'pm\\.response\\.headers\\.count\\(': 'res.headerList.count(',
+  'pm\\.response\\.headers\\.indexOf\\(': 'res.headerList.indexOf(',
+  'pm\\.response\\.headers\\.find\\(': 'res.headerList.find(',
+  'pm\\.response\\.headers\\.filter\\(': 'res.headerList.filter(',
+  'pm\\.response\\.headers\\.each\\(': 'res.headerList.forEach(',
+  'pm\\.response\\.headers\\.map\\(': 'res.headerList.map(',
+  'pm\\.response\\.headers\\.reduce\\(': 'res.headerList.reduce(',
+  'pm\\.response\\.headers\\.toObject\\(': 'res.headerList.toObject(',
+  'pm\\.response\\.headers\\.toString\\(': 'res.headerList.toString(',
+  'pm\\.response\\.headers\\.toJSON\\(': 'res.headerList.toJSON(',
   'pm\\.response\\.to\\.have\\.jsonSchema\\(': 'expect(res.getBody()).to.have.jsonSchema(',
   'pm\\.response\\.to\\.not\\.have\\.jsonSchema\\(': 'expect(res.getBody()).to.not.have.jsonSchema(',
   'pm\\.response\\.not\\.to\\.have\\.jsonSchema\\(': 'expect(res.getBody()).not.to.have.jsonSchema(',
diff --git a/packages/bruno-converters/src/utils/bruno-to-postman-translator.js b/packages/bruno-converters/src/utils/bruno-to-postman-translator.js
index 65fc2bbca7e..f77f862dfd9 100644
--- a/packages/bruno-converters/src/utils/bruno-to-postman-translator.js
+++ b/packages/bruno-converters/src/utils/bruno-to-postman-translator.js
@@ -90,6 +90,8 @@ const simpleTranslations = {
   'req.headerList.map': 'pm.request.headers.map',
   'req.headerList.reduce': 'pm.request.headers.reduce',
   'req.headerList.toObject': 'pm.request.headers.toObject',
+  'req.headerList.toString': 'pm.request.headers.toString',
+  'req.headerList.toJSON': 'pm.request.headers.toJSON',
   'req.headerList.append': 'pm.request.headers.add',
   'req.headerList.set': 'pm.request.headers.upsert',
   'req.headerList.delete': 'pm.request.headers.remove',
@@ -130,6 +132,8 @@ const simpleTranslations = {
   'res.headerList.map': 'pm.response.headers.map',
   'res.headerList.reduce': 'pm.response.headers.reduce',
   'res.headerList.toObject': 'pm.response.headers.toObject',
+  'res.headerList.toString': 'pm.response.headers.toString',
+  'res.headerList.toJSON': 'pm.response.headers.toJSON',
 
   // Cookies jar
   'bru.cookies.jar': 'pm.cookies.jar',
diff --git a/packages/bruno-converters/src/utils/postman-to-bruno-translator.js b/packages/bruno-converters/src/utils/postman-to-bruno-translator.js
index fa9ae4dc680..65ae1fac104 100644
--- a/packages/bruno-converters/src/utils/postman-to-bruno-translator.js
+++ b/packages/bruno-converters/src/utils/postman-to-bruno-translator.js
@@ -65,6 +65,8 @@ const simpleTranslations = {
   'pm.request.headers.map': 'req.headerList.map',
   'pm.request.headers.reduce': 'req.headerList.reduce',
   'pm.request.headers.toObject': 'req.headerList.toObject',
+  'pm.request.headers.toString': 'req.headerList.toString',
+  'pm.request.headers.toJSON': 'req.headerList.toJSON',
   'pm.request.headers.clear': 'req.headerList.clear',
 
   // Response headers PropertyList methods (read-only)
@@ -79,6 +81,8 @@ const simpleTranslations = {
   'pm.response.headers.map': 'res.headerList.map',
   'pm.response.headers.reduce': 'res.headerList.reduce',
   'pm.response.headers.toObject': 'res.headerList.toObject',
+  'pm.response.headers.toString': 'res.headerList.toString',
+  'pm.response.headers.toJSON': 'res.headerList.toJSON',
 
   // Request properties (pm.request.*)
   'pm.request.url.getHost': 'req.getHost',
@@ -409,6 +413,32 @@ const complexTransformations = [
     }
   },
 
+  // Lossy: positional header inserts → append (only keep the first arg, drop positional ref)
+  // pm.request.headers.prepend(item) -> req.headerList.append(item)
+  {
+    pattern: 'pm.request.headers.prepend',
+    transform: (path, j) => {
+      const args = path.parent.value.arguments;
+      return j.callExpression(j.identifier('req.headerList.append'), args.length > 0 ? [args[0]] : []);
+    }
+  },
+  // pm.request.headers.insert(item, before) -> req.headerList.append(item)
+  {
+    pattern: 'pm.request.headers.insert',
+    transform: (path, j) => {
+      const args = path.parent.value.arguments;
+      return j.callExpression(j.identifier('req.headerList.append'), args.length > 0 ? [args[0]] : []);
+    }
+  },
+  // pm.request.headers.insertAfter(item, after) -> req.headerList.append(item)
+  {
+    pattern: 'pm.request.headers.insertAfter',
+    transform: (path, j) => {
+      const args = path.parent.value.arguments;
+      return j.callExpression(j.identifier('req.headerList.append'), args.length > 0 ? [args[0]] : []);
+    }
+  },
+
   // pm.response.to.be.ok -> expect(res.getStatus()).to.be.within(200, 299)
   {
     pattern: 'pm.response.to.be.ok',
diff --git a/packages/bruno-converters/tests/bruno/bruno-to-postman-translations/request.test.js b/packages/bruno-converters/tests/bruno/bruno-to-postman-translations/request.test.js
index 63305a3285f..3a38779ef69 100644
--- a/packages/bruno-converters/tests/bruno/bruno-to-postman-translations/request.test.js
+++ b/packages/bruno-converters/tests/bruno/bruno-to-postman-translations/request.test.js
@@ -292,6 +292,18 @@ console.log("Headers:", JSON.stringify(pm.request.headers));
     expect(translatedCode).toBe('const obj = pm.request.headers.toObject();');
   });
 
+  it('should translate req.headerList.toString to pm.request.headers.toString', () => {
+    const code = 'const str = req.headerList.toString();';
+    const translatedCode = translateBruToPostman(code);
+    expect(translatedCode).toBe('const str = pm.request.headers.toString();');
+  });
+
+  it('should translate req.headerList.toJSON to pm.request.headers.toJSON', () => {
+    const code = 'const json = req.headerList.toJSON();';
+    const translatedCode = translateBruToPostman(code);
+    expect(translatedCode).toBe('const json = pm.request.headers.toJSON();');
+  });
+
   it('should translate req.headerList.set to pm.request.headers.upsert', () => {
     const code = 'req.headerList.set({key: "X-Custom", value: "updated"});';
     const translatedCode = translateBruToPostman(code);
diff --git a/packages/bruno-converters/tests/postman/postman-translations/transpiler-tests/request.test.js b/packages/bruno-converters/tests/postman/postman-translations/transpiler-tests/request.test.js
index 01f8ff0c3e8..bd057524078 100644
--- a/packages/bruno-converters/tests/postman/postman-translations/transpiler-tests/request.test.js
+++ b/packages/bruno-converters/tests/postman/postman-translations/transpiler-tests/request.test.js
@@ -201,9 +201,39 @@ describe('Request Translation', () => {
     expect(translatedCode).toBe('req.headerList.clear();');
   });
 
+  it('should translate pm.request.headers.prepend to req.headerList.append', () => {
+    const code = 'pm.request.headers.prepend({key: "X-First", value: "1"});';
+    const translatedCode = translateCode(code);
+    expect(translatedCode).toBe('req.headerList.append({key: "X-First", value: "1"});');
+  });
+
+  it('should translate pm.request.headers.insert to req.headerList.append (drops positional ref)', () => {
+    const code = 'pm.request.headers.insert({key: "X-Mid", value: "2"}, "ref");';
+    const translatedCode = translateCode(code);
+    expect(translatedCode).toBe('req.headerList.append({key: "X-Mid", value: "2"});');
+  });
+
+  it('should translate pm.request.headers.insertAfter to req.headerList.append (drops positional ref)', () => {
+    const code = 'pm.request.headers.insertAfter({key: "X-After", value: "3"}, "ref");';
+    const translatedCode = translateCode(code);
+    expect(translatedCode).toBe('req.headerList.append({key: "X-After", value: "3"});');
+  });
+
   it('should translate pm.request.headers.toObject to req.headerList.toObject', () => {
     const code = 'const obj = pm.request.headers.toObject();';
     const translatedCode = translateCode(code);
     expect(translatedCode).toBe('const obj = req.headerList.toObject();');
   });
+
+  it('should translate pm.request.headers.toString to req.headerList.toString', () => {
+    const code = 'const str = pm.request.headers.toString();';
+    const translatedCode = translateCode(code);
+    expect(translatedCode).toBe('const str = req.headerList.toString();');
+  });
+
+  it('should translate pm.request.headers.toJSON to req.headerList.toJSON', () => {
+    const code = 'const json = pm.request.headers.toJSON();';
+    const translatedCode = translateCode(code);
+    expect(translatedCode).toBe('const json = req.headerList.toJSON();');
+  });
 });
diff --git a/packages/bruno-converters/tests/postman/postman-translations/transpiler-tests/response.test.js b/packages/bruno-converters/tests/postman/postman-translations/transpiler-tests/response.test.js
index 5a08a540dd8..fdc70673e3d 100644
--- a/packages/bruno-converters/tests/postman/postman-translations/transpiler-tests/response.test.js
+++ b/packages/bruno-converters/tests/postman/postman-translations/transpiler-tests/response.test.js
@@ -894,4 +894,16 @@ describe('Response Translation', () => {
     const translatedCode = translateCode(code);
     expect(translatedCode).toBe('const obj = res.headerList.toObject();');
   });
+
+  it('should translate pm.response.headers.toString to res.headerList.toString', () => {
+    const code = 'const str = pm.response.headers.toString();';
+    const translatedCode = translateCode(code);
+    expect(translatedCode).toBe('const str = res.headerList.toString();');
+  });
+
+  it('should translate pm.response.headers.toJSON to res.headerList.toJSON', () => {
+    const code = 'const json = pm.response.headers.toJSON();';
+    const translatedCode = translateCode(code);
+    expect(translatedCode).toBe('const json = res.headerList.toJSON();');
+  });
 });
diff --git a/packages/bruno-js/src/header-list.js b/packages/bruno-js/src/header-list.js
index 8f5cade6a00..dd593b5766d 100644
--- a/packages/bruno-js/src/header-list.js
+++ b/packages/bruno-js/src/header-list.js
@@ -1,4 +1,3 @@
-const PropertyList = require('./property-list');
 const ReadOnlyPropertyList = require('./readonly-property-list');
 
 /**
@@ -78,7 +77,7 @@ const ReadOnlyPropertyList = require('./readonly-property-list');
  * | `repopulate(items)`               | Clears all, then populates with new items                 |
  * | `assimilate(source, prune?)`      | Merges headers; prune removes items not in source         |
  */
-class HeaderList extends PropertyList {
+class HeaderList extends ReadOnlyPropertyList {
   #req;
   #writable;
 
@@ -151,6 +150,12 @@ class HeaderList extends PropertyList {
     return { key: str.substring(0, idx).trim(), value: str.substring(idx + 1).trim() };
   }
 
+  // ── Blocked inherited methods ─────────────────────────────────────────
+  // These are inherited from ReadOnlyPropertyList but are not part of
+  // the HeaderList API. Set to undefined so they are not callable.
+  idx = undefined;
+  each = undefined;
+
   // ── Read method overrides (case-insensitive) ──────────────────────────
 
   /**
diff --git a/packages/bruno-js/src/sandbox/quickjs/shims/bruno-request.js b/packages/bruno-js/src/sandbox/quickjs/shims/bruno-request.js
index e4ce5ac6ff6..23027d3b6c8 100644
--- a/packages/bruno-js/src/sandbox/quickjs/shims/bruno-request.js
+++ b/packages/bruno-js/src/sandbox/quickjs/shims/bruno-request.js
@@ -38,7 +38,7 @@ const addBrunoRequestShimToContext = (vm, req) => {
   const { evalCode: headersEvalCode } = createPropertyListBridge(vm, req.headerList, headerListObj, {
     globalPath: 'globalThis.req.headerList',
     syncReadMethods: ['get', 'has', 'count', 'indexOf', 'toObject', 'toString'],
-    syncReadObjectMethods: ['one', 'all', 'idx', 'toJSON'],
+    syncReadObjectMethods: ['one', 'all', 'toJSON'],
     syncWriteMethods: ['append', 'set', 'delete', 'clear', 'populate', 'repopulate', 'assimilate'],
     withIterators: true
   });
@@ -197,7 +197,7 @@ const addBrunoRequestShimToContext = (vm, req) => {
   // Wrapped in a block to avoid const redeclaration conflicts with other evalCode blocks
   // The bridge generates `each` (shared with CookieList); alias `forEach` for HeaderList's MDN-style API
   if (headersEvalCode) {
-    vm.evalCode(`{ ${headersEvalCode} globalThis.req.headerList.forEach = globalThis.req.headerList.each; }`);
+    vm.evalCode(`{ ${headersEvalCode} globalThis.req.headerList.forEach = globalThis.req.headerList.each; delete globalThis.req.headerList.each; }`);
   }
 };
 
diff --git a/packages/bruno-js/src/sandbox/quickjs/shims/bruno-response.js b/packages/bruno-js/src/sandbox/quickjs/shims/bruno-response.js
index 329e198dab2..93b9ebcd85e 100644
--- a/packages/bruno-js/src/sandbox/quickjs/shims/bruno-response.js
+++ b/packages/bruno-js/src/sandbox/quickjs/shims/bruno-response.js
@@ -63,7 +63,7 @@ const addBrunoResponseShimToContext = (vm, res) => {
     const bridge = createPropertyListBridge(vm, res.headerList, headerListObj, {
       globalPath: 'globalThis.res.headerList',
       syncReadMethods: ['get', 'has', 'count', 'indexOf', 'toObject', 'toString'],
-      syncReadObjectMethods: ['one', 'all', 'idx', 'toJSON'],
+      syncReadObjectMethods: ['one', 'all', 'toJSON'],
       syncWriteMethods: ['append', 'set', 'delete', 'clear', 'populate', 'repopulate', 'assimilate'],
       withIterators: true
     });
@@ -133,7 +133,7 @@ const addBrunoResponseShimToContext = (vm, res) => {
   // Wrapped in a block to avoid const redeclaration conflicts with req.headerList's evalCode
   // The bridge generates `each` (shared with CookieList); alias `forEach` for HeaderList's MDN-style API
   if (resHeadersEvalCode) {
-    vm.evalCode(`{ ${resHeadersEvalCode} globalThis.res.headerList.forEach = globalThis.res.headerList.each; }`);
+    vm.evalCode(`{ ${resHeadersEvalCode} globalThis.res.headerList.forEach = globalThis.res.headerList.each; delete globalThis.res.headerList.each; }`);
   }
 };
 
diff --git a/packages/bruno-js/tests/header-list.spec.js b/packages/bruno-js/tests/header-list.spec.js
index bf1f10d56b4..6bb1614d5ba 100644
--- a/packages/bruno-js/tests/header-list.spec.js
+++ b/packages/bruno-js/tests/header-list.spec.js
@@ -1,5 +1,4 @@
 const HeaderList = require('../src/header-list');
-const PropertyList = require('../src/property-list');
 const ReadOnlyPropertyList = require('../src/readonly-property-list');
 const BrunoRequest = require('../src/bruno-request');
 const BrunoResponse = require('../src/bruno-response');
@@ -19,10 +18,9 @@ describe('HeaderList (req.headerList)', () => {
 
   // ── Inheritance ────────────────────────────────────────────────────────
 
-  test('extends PropertyList and ReadOnlyPropertyList', () => {
+  test('extends ReadOnlyPropertyList', () => {
     const { list } = createReqHeaders();
     expect(list).toBeInstanceOf(ReadOnlyPropertyList);
-    expect(list).toBeInstanceOf(PropertyList);
     expect(list).toBeInstanceOf(HeaderList);
   });
 
@@ -73,17 +71,6 @@ describe('HeaderList (req.headerList)', () => {
       expect(a1).not.toBe(a2);
     });
 
-    test('idx() returns header at position', () => {
-      const { list } = createReqHeaders();
-      expect(list.idx(0)).toEqual({ key: 'Content-Type', value: 'application/json' });
-      expect(list.idx(2)).toEqual({ key: 'Accept', value: '*/*' });
-    });
-
-    test('idx() returns undefined for out-of-bounds', () => {
-      const { list } = createReqHeaders();
-      expect(list.idx(10)).toBeUndefined();
-    });
-
     test('count() returns number of headers', () => {
       const { list } = createReqHeaders();
       expect(list.count()).toBe(3);
@@ -923,11 +910,6 @@ describe('Response Headers (res.headerList)', () => {
       expect(headerList.count()).toBe(3);
     });
 
-    test('idx() returns header at position', () => {
-      const { headerList } = createResHeaders();
-      expect(headerList.idx(1)).toEqual({ key: 'x-request-id', value: 'abc-123' });
-    });
-
     test('indexOf() finds structurally-equal header', () => {
       const { headerList } = createResHeaders();
       expect(headerList.indexOf({ key: 'content-type', value: 'application/json' })).toBe(0);
diff --git a/packages/bruno-tests/collection/scripting/api/req/headerList/read-methods.bru b/packages/bruno-tests/collection/scripting/api/req/headerList/read-methods.bru
index 764568b2f4d..9c54cae20b7 100644
--- a/packages/bruno-tests/collection/scripting/api/req/headerList/read-methods.bru
+++ b/packages/bruno-tests/collection/scripting/api/req/headerList/read-methods.bru
@@ -44,13 +44,6 @@ tests {
     expect(keys).to.include('x-custom');
   });
 
-  test("req.headerList.idx(index)", function() {
-    const first = req.headerList.idx(0);
-    expect(first).to.have.property('key');
-    expect(first).to.have.property('value');
-    expect(req.headerList.idx(-1)).to.be.undefined;
-  });
-
   test("req.headerList.count()", function() {
     expect(req.headerList.count()).to.be.at.least(3);
   });
diff --git a/packages/bruno-tests/collection/scripting/api/res/headerList/read-methods.bru b/packages/bruno-tests/collection/scripting/api/res/headerList/read-methods.bru
index 3553e3645e3..ffb840dee41 100644
--- a/packages/bruno-tests/collection/scripting/api/res/headerList/read-methods.bru
+++ b/packages/bruno-tests/collection/scripting/api/res/headerList/read-methods.bru
@@ -40,13 +40,6 @@ tests {
     expect(keys).to.include('x-powered-by');
   });
 
-  test("res.headerList.idx(index)", function() {
-    const first = res.headerList.idx(0);
-    expect(first).to.have.property('key');
-    expect(first).to.have.property('value');
-    expect(res.headerList.idx(-1)).to.be.undefined;
-  });
-
   test("res.headerList.count()", function() {
     expect(res.headerList.count()).to.be.at.least(1);
   });