diff --git a/lib/PasswordGenerator.ts b/lib/PasswordGenerator.ts
index 414cf9f..566be92 100644
--- a/lib/PasswordGenerator.ts
+++ b/lib/PasswordGenerator.ts
@@ -7,14 +7,35 @@ const AsciiRange = {
     /** childe mark ~ */
     max: 126,
 }
+const optRegexes = {
+    space: " ",
+    special: "!\"#\\$%&'\\(\\)\\*\\+,-./:;<=>\\?@\\[\\\\\\]\\^_`\\{|\\}~",
+    number: "\\d",
+};
+
+export interface DisableOptions {
+    space?: boolean;
+    special?: boolean;
+    number?: boolean;
+}
+
+export async function generatePassword(length: number, disableOpts?: DisableOptions): Promise<string> {
+    if (length < 5) {
+        throw new Error("Password length must be longer than 5.");
+    }
 
-export async function generatePassword(length: number): Promise<string> {
     let result = "";
+    const regex = createRegex(disableOpts)
+
     while (true) {
         const bytes = await promisify(crypto.randomBytes)(length * 2);
         const byteArray = Array.from(bytes);
         const filtered = byteArray.filter(isInAsciiRange);
         result += String.fromCharCode(...filtered);
+        if (regex) {
+            result = result.replace(regex, "");
+        }
+
         if (result.length >= length) {
             result = result.slice(0, length);
             break;
@@ -25,4 +46,16 @@ export async function generatePassword(length: number): Promise<string> {
 
 function isInAsciiRange(value: number) {
     return AsciiRange.min <= value && value <= AsciiRange.max;
+}
+
+function createRegex(disableOpts?: DisableOptions): RegExp | undefined {
+    if (!disableOpts) {
+        return undefined;
+    }
+    let reg = "";
+    if (disableOpts?.space) { reg += optRegexes.space };
+    if (disableOpts?.special) { reg += optRegexes.special };
+    if (disableOpts?.number) { reg += optRegexes.number };
+
+    return new RegExp(`[${reg}]`, "g");
 }
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diff --git a/lib/PasswordGeneratorNode.html b/lib/PasswordGeneratorNode.html
index 1697c12..6f1b099 100644
--- a/lib/PasswordGeneratorNode.html
+++ b/lib/PasswordGeneratorNode.html
@@ -5,8 +5,11 @@
         color: "#D8BFD8",
         defaults: {
             name: { value: "" },
-            length: { value: "", required: true, validate: RED.validators.number() },
+            length: { value: "", required: true, validate: (v) => v > 4 },
             setTo: { value: "" },
+            isNumberDisabled: { value: false, require: true },
+            isSpecialCharsDisabled: { value: false, require: true },
+            isSpaceDisabled: { value: false, require: true },
         },
         inputs: 1,
         outputs: 1,
@@ -26,9 +29,21 @@
         <input type="text" id="node-input-length">
     </div>
     <div class="form-row">
-        <label for="node-input-setTo"><i class="fa fa-ellipsis-he"></i> to</label>
+        <label for="node-input-setTo"><i class="fa fa-ellipsis-h"></i> to</label>
         <input type="text" id="node-input-setTo">
     </div>
+    <div class="form-row">
+        <label for="node-input-isNumberDisabled"> Disable Number</label>
+        <input type="checkbox" id="node-input-isNumberDisabled">
+    </div>
+    <div class="form-row">
+        <label for="node-input-isSpecialCharsDisabled"> Disable Special chars</label>
+        <input type="checkbox" id="node-input-isSpecialCharsDisabled">
+    </div>
+    <div class="form-row">
+        <label for="node-input-isSpaceDisabled"> Disable Space</label>
+        <input type="checkbox" id="node-input-isSpaceDisabled">
+    </div>
 </script>
 
 <script type="text/html" data-help-name="password-generator">
@@ -40,5 +55,7 @@
         <dd> Password length. </dd>
         <dt>to</dt>
         <dd> The property to set generated password. </dd>
+        <dt>Disable options</dt>
+        <dd> Excludes the characters from the generated password. </dd>
     </dl>
-</script>
+</script>
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diff --git a/test/PasswordGenerator_spec.ts b/test/PasswordGenerator_spec.ts
index ee938b8..b92a009 100644
--- a/test/PasswordGenerator_spec.ts
+++ b/test/PasswordGenerator_spec.ts
@@ -1,22 +1,60 @@
 import "mocha";
-import * as crypto from "crypto";
 import { expect } from "chai";
 import * as sinon from "sinon";
-import { generatePassword } from "../lib/PasswordGenerator";
+import { generatePassword, DisableOptions } from "../lib/PasswordGenerator";
 
 describe("PasswordGenerator", () => {
-    it("should return true for the first time", async () => {
-        const result = await generatePassword(10);
-        expect(result).to.lengthOf(10);
+    afterEach(() => {
+        sinon.restore();
+    });
+
+    it("should throw an error when length is 4", (done) => {
+        generatePassword(4)
+            .then(() => done("Error didn't occur."))
+            .catch(() => done());
+    });
+
+    it("should return password when length is 5", async () => {
+        const result = await generatePassword(5);
+        expect(result).to.lengthOf(5);
+    });
+
+    [
+        { regex: /0123456789/, title: "number" },
+        { regex: / /, title: "space" },
+        { regex: /abcdefghijklmnopqrstuvwxyz/, title: "lowercase" },
+        { regex: /ABCDEFGHIJKLMNOPQRSTUVWXYZ/, title: "uppercase" },
+        { regex: /!\"#\$%&'\(\)\*\+,-.\//, title: "special characters group 1" },
+        { regex: /:;<=>\?@/, title: "special characters group 2" },
+        { regex: /\[\\\]\^_`/, title: "special characters group 3" },
+        { regex: /\{|\}~/, title: "special characters group 4" },
+    ].forEach((testData) => {
+        it(`should contain ${testData.title} without option`, async () => {
+            const fakeData = Array.from(Array(256).keys());
+            sinon.stub(Array, "from").returns(fakeData);
+            const result = await generatePassword(256);
+            expect(result).to.match(testData.regex);
+        });
+    });
+
+    it("should not contain number when option number is true", async () => {
+        const fakeData = Array.from(Array(256).keys());
+        sinon.stub(Array, "from").returns(fakeData);
+        const result = await generatePassword(256, { number: true });
+        expect(result).not.to.match(/\d/);
+    });
+
+    it("should not contain space when option space is true", async () => {
+        const fakeData = Array.from(Array(256).keys());
+        sinon.stub(Array, "from").returns(fakeData);
+        const result = await generatePassword(256, { space: true });
+        expect(result).not.to.contain(" ");
+    });
+
+    it("should not contain special characters when option space is true", async () => {
+        const fakeData = Array.from(Array(256).keys());
+        sinon.stub(Array, "from").returns(fakeData);
+        const result = await generatePassword(256, { special: true });
+        expect(result).not.to.match(/[\[!\"#\$%&'\(\)\*\+,\-./:;<=>\?@\[\\\]\^_`{|}\]]/);
     });
-    // it.only("should return true for the first time", async () => {
-    //     const testData = Buffer.from([31, 32, 126, 127]);
-    //     sinon.stub(crypto, "randomBytes")
-    //         .callsFake((size: number, cb: (err: Error | null, buf: Buffer) => void) => {
-    //             console.log("HEY")
-    //             cb(null, testData);
-    //         });
-    //     const result = await generatePassword(10);
-    //     expect(result).to.equal(" ~");
-    // });
 });
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