diff --git a/js/form_data.ts b/js/form_data.ts
index 6f0cadfef1..163c33b748 100644
--- a/js/form_data.ts
+++ b/js/form_data.ts
@@ -3,6 +3,7 @@ import * as domTypes from "./dom_types";
 import * as blob from "./blob";
 import * as file from "./file";
 import { DomIterableMixin } from "./mixins/dom_iterable";
+import { requiredArguments } from "./util";
 
 const dataSymbol = Symbol("data");
 
@@ -18,6 +19,8 @@ class FormDataBase {
   append(name: string, value: string): void;
   append(name: string, value: blob.DenoBlob, filename?: string): void;
   append(name: string, value: string | blob.DenoBlob, filename?: string): void {
+    requiredArguments("FormData.append", arguments.length, 2);
+    name = String(name);
     if (value instanceof blob.DenoBlob) {
       const dfile = new file.DenoFile([value], filename || name);
       this[dataSymbol].push([name, dfile]);
@@ -31,6 +34,8 @@ class FormDataBase {
    *       formData.delete('name');
    */
   delete(name: string): void {
+    requiredArguments("FormData.delete", arguments.length, 1);
+    name = String(name);
     let i = 0;
     while (i < this[dataSymbol].length) {
       if (this[dataSymbol][i][0] === name) {
@@ -47,6 +52,8 @@ class FormDataBase {
    *       formData.getAll('name');
    */
   getAll(name: string): domTypes.FormDataEntryValue[] {
+    requiredArguments("FormData.getAll", arguments.length, 1);
+    name = String(name);
     const values = [];
     for (const entry of this[dataSymbol]) {
       if (entry[0] === name) {
@@ -63,6 +70,8 @@ class FormDataBase {
    *       formData.get('name');
    */
   get(name: string): domTypes.FormDataEntryValue | null {
+    requiredArguments("FormData.get", arguments.length, 1);
+    name = String(name);
     for (const entry of this[dataSymbol]) {
       if (entry[0] === name) {
         return entry[1];
@@ -78,23 +87,53 @@ class FormDataBase {
    *       formData.has('name');
    */
   has(name: string): boolean {
+    requiredArguments("FormData.has", arguments.length, 1);
+    name = String(name);
     return this[dataSymbol].some(entry => entry[0] === name);
   }
 
   /** Sets a new value for an existing key inside a `FormData` object, or
    * adds the key/value if it does not already exist.
+   * ref: https://xhr.spec.whatwg.org/#dom-formdata-set
    *
    *       formData.set('name', 'value');
    */
   set(name: string, value: string): void;
   set(name: string, value: blob.DenoBlob, filename?: string): void;
   set(name: string, value: string | blob.DenoBlob, filename?: string): void {
-    this.delete(name);
-    if (value instanceof blob.DenoBlob) {
-      const dfile = new file.DenoFile([value], filename || name);
-      this[dataSymbol].push([name, dfile]);
-    } else {
-      this[dataSymbol].push([name, String(value)]);
+    requiredArguments("FormData.set", arguments.length, 2);
+    name = String(name);
+
+    // If there are any entries in the context object’s entry list whose name
+    // is name, replace the first such entry with entry and remove the others
+    let found = false;
+    let i = 0;
+    while (i < this[dataSymbol].length) {
+      if (this[dataSymbol][i][0] === name) {
+        if (!found) {
+          if (value instanceof blob.DenoBlob) {
+            const dfile = new file.DenoFile([value], filename || name);
+            this[dataSymbol][i][1] = dfile;
+          } else {
+            this[dataSymbol][i][1] = String(value);
+          }
+          found = true;
+        } else {
+          this[dataSymbol].splice(i, 1);
+          continue;
+        }
+      }
+      i++;
+    }
+
+    // Otherwise, append entry to the context object’s entry list.
+    if (!found) {
+      if (value instanceof blob.DenoBlob) {
+        const dfile = new file.DenoFile([value], filename || name);
+        this[dataSymbol].push([name, dfile]);
+      } else {
+        this[dataSymbol].push([name, String(value)]);
+      }
     }
   }
 }
diff --git a/js/form_data_test.ts b/js/form_data_test.ts
index f3fbdd8724..109220f631 100644
--- a/js/form_data_test.ts
+++ b/js/form_data_test.ts
@@ -96,3 +96,73 @@ test(function formDataParamsForEachSuccess() {
   });
   assertEqual(callNum, init.length);
 });
+
+test(function formDataParamsArgumentsCheck() {
+  const methodRequireOneParam = ["delete", "getAll", "get", "has", "forEach"];
+
+  const methodRequireTwoParams = ["append", "set"];
+
+  methodRequireOneParam.forEach(method => {
+    const formData = new FormData();
+    let hasThrown = 0;
+    let errMsg = "";
+    try {
+      formData[method]();
+      hasThrown = 1;
+    } catch (err) {
+      errMsg = err.message;
+      if (err instanceof TypeError) {
+        hasThrown = 2;
+      } else {
+        hasThrown = 3;
+      }
+    }
+    assertEqual(hasThrown, 2);
+    assertEqual(
+      errMsg,
+      `FormData.${method} requires at least 1 argument, but only 0 present`
+    );
+  });
+
+  methodRequireTwoParams.forEach(method => {
+    const formData = new FormData();
+    let hasThrown = 0;
+    let errMsg = "";
+
+    try {
+      formData[method]();
+      hasThrown = 1;
+    } catch (err) {
+      errMsg = err.message;
+      if (err instanceof TypeError) {
+        hasThrown = 2;
+      } else {
+        hasThrown = 3;
+      }
+    }
+    assertEqual(hasThrown, 2);
+    assertEqual(
+      errMsg,
+      `FormData.${method} requires at least 2 arguments, but only 0 present`
+    );
+
+    hasThrown = 0;
+    errMsg = "";
+    try {
+      formData[method]("foo");
+      hasThrown = 1;
+    } catch (err) {
+      errMsg = err.message;
+      if (err instanceof TypeError) {
+        hasThrown = 2;
+      } else {
+        hasThrown = 3;
+      }
+    }
+    assertEqual(hasThrown, 2);
+    assertEqual(
+      errMsg,
+      `FormData.${method} requires at least 2 arguments, but only 1 present`
+    );
+  });
+});
diff --git a/js/headers.ts b/js/headers.ts
index ca99d5789b..7cc38181f8 100644
--- a/js/headers.ts
+++ b/js/headers.ts
@@ -1,6 +1,7 @@
 // Copyright 2018 the Deno authors. All rights reserved. MIT license.
 import * as domTypes from "./dom_types";
 import { DomIterableMixin } from "./mixins/dom_iterable";
+import { requiredArguments } from "./util";
 
 // From node-fetch
 // Copyright (c) 2016 David Frank. MIT License.
@@ -75,6 +76,7 @@ class HeadersBase {
 
   // ref: https://fetch.spec.whatwg.org/#concept-headers-append
   append(name: string, value: string): void {
+    requiredArguments("Headers.append", arguments.length, 2);
     const [newname, newvalue] = this._normalizeParams(name, value);
     this._validateName(newname);
     this._validateValue(newvalue);
@@ -84,12 +86,14 @@ class HeadersBase {
   }
 
   delete(name: string): void {
+    requiredArguments("Headers.delete", arguments.length, 1);
     const [newname] = this._normalizeParams(name);
     this._validateName(newname);
     this[headerMap].delete(newname);
   }
 
   get(name: string): string | null {
+    requiredArguments("Headers.get", arguments.length, 1);
     const [newname] = this._normalizeParams(name);
     this._validateName(newname);
     const value = this[headerMap].get(newname);
@@ -97,12 +101,14 @@ class HeadersBase {
   }
 
   has(name: string): boolean {
+    requiredArguments("Headers.has", arguments.length, 1);
     const [newname] = this._normalizeParams(name);
     this._validateName(newname);
     return this[headerMap].has(newname);
   }
 
   set(name: string, value: string): void {
+    requiredArguments("Headers.set", arguments.length, 2);
     const [newname, newvalue] = this._normalizeParams(name, value);
     this._validateName(newname);
     this._validateValue(newvalue);
diff --git a/js/headers_test.ts b/js/headers_test.ts
index 53c8ef089d..9591b24f82 100644
--- a/js/headers_test.ts
+++ b/js/headers_test.ts
@@ -228,3 +228,73 @@ test(function headerIllegalReject() {
   // 'o k' is valid value but invalid name
   new Headers({ "He-y": "o k" });
 });
+
+test(function headerParamsArgumentsCheck() {
+  const methodRequireOneParam = ["delete", "get", "has", "forEach"];
+
+  const methodRequireTwoParams = ["append", "set"];
+
+  methodRequireOneParam.forEach(method => {
+    const headers = new Headers();
+    let hasThrown = 0;
+    let errMsg = "";
+    try {
+      headers[method]();
+      hasThrown = 1;
+    } catch (err) {
+      errMsg = err.message;
+      if (err instanceof TypeError) {
+        hasThrown = 2;
+      } else {
+        hasThrown = 3;
+      }
+    }
+    assertEqual(hasThrown, 2);
+    assertEqual(
+      errMsg,
+      `Headers.${method} requires at least 1 argument, but only 0 present`
+    );
+  });
+
+  methodRequireTwoParams.forEach(method => {
+    const headers = new Headers();
+    let hasThrown = 0;
+    let errMsg = "";
+
+    try {
+      headers[method]();
+      hasThrown = 1;
+    } catch (err) {
+      errMsg = err.message;
+      if (err instanceof TypeError) {
+        hasThrown = 2;
+      } else {
+        hasThrown = 3;
+      }
+    }
+    assertEqual(hasThrown, 2);
+    assertEqual(
+      errMsg,
+      `Headers.${method} requires at least 2 arguments, but only 0 present`
+    );
+
+    hasThrown = 0;
+    errMsg = "";
+    try {
+      headers[method]("foo");
+      hasThrown = 1;
+    } catch (err) {
+      errMsg = err.message;
+      if (err instanceof TypeError) {
+        hasThrown = 2;
+      } else {
+        hasThrown = 3;
+      }
+    }
+    assertEqual(hasThrown, 2);
+    assertEqual(
+      errMsg,
+      `Headers.${method} requires at least 2 arguments, but only 1 present`
+    );
+  });
+});
diff --git a/js/mixins/dom_iterable.ts b/js/mixins/dom_iterable.ts
index 2daf80b715..6a2a9fcfea 100644
--- a/js/mixins/dom_iterable.ts
+++ b/js/mixins/dom_iterable.ts
@@ -1,5 +1,6 @@
 import { DomIterable } from "../dom_types";
 import { globalEval } from "../global_eval";
+import { requiredArguments } from "../util";
 
 // if we import it directly from "globals" it will break the unit tests so we
 // have to grab a reference to the global scope a different way
@@ -52,6 +53,11 @@ export function DomIterableMixin<K, V, TBase extends Constructor>(
       // tslint:disable-next-line:no-any
       thisArg?: any
     ): void {
+      requiredArguments(
+        `${this.constructor.name}.forEach`,
+        arguments.length,
+        1
+      );
       callbackfn = callbackfn.bind(thisArg == null ? window : Object(thisArg));
       for (const [key, value] of (this as any)[dataSymbol]) {
         callbackfn(value, key, this);