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Generate Random Phone Numbers in JavaScript

Complete code tutorial with examples and best practices

PHP

JavaScript

[ Code Example - Quick Summary ]

Language: JavaScript

What: Generate random phone numbers in JavaScript using Math.random() and faker-js. Covers US format, international format, and validation for testing.

Try it: Use our interactive Phone-numbers generator or integrate this code into your JavaScript application.

Generate random phone numbers in JavaScript using Math.random() and faker-js. Covers US format, international format, and validation for testing. Looking for other languages? Check our code examples in PHP , Python , Java , C# , C++ , Ruby and Go or use our interactive web generator.

JavaScript Code Example

// Generate random US phone number (xxx) xxx-xxxx
function randomUsPhoneNumber() {
    const areaCode = Math.floor(Math.random() * 800) + 200;
    const exchange = Math.floor(Math.random() * 800) + 200;
    const lineNumber = Math.floor(Math.random() * 9000) + 1000;
    return `(${areaCode.toString().padStart(3, "0")}) ${exchange.toString().padStart(3, "0")}-${lineNumber.toString().padStart(4, "0")}`;
}

// Generate random phone number with country code
function randomInternationalPhone(countryCode = "+1") {
    const areaCode = Math.floor(Math.random() * 800) + 200;
    const exchange = Math.floor(Math.random() * 800) + 200;
    const lineNumber = Math.floor(Math.random() * 9000) + 1000;
    return `${countryCode} (${areaCode.toString().padStart(3, "0")}) ${exchange.toString().padStart(3, "0")}-${lineNumber.toString().padStart(4, "0")}`;
}

// Generate phone number without formatting
function randomPhoneDigits(length = 10) {
    return Array.from({ length }, () => Math.floor(Math.random() * 10)).join("");
}

// Validate US phone number format
function isValidUsPhone(phone) {
    const pattern = /^\(\d{3}\) \d{3}-\d{4}$/;
    return pattern.test(phone);
}

// Generate multiple phone numbers
function generatePhoneNumbers(count = 10) {
    return Array.from({ length: count }, () => randomUsPhoneNumber());
}

// Using faker-js library (npm install @faker-js/faker)
// import { faker } from "@faker-js/faker";
// const phone = faker.phone.number("(###) ###-####"); // (555) 123-4567
// const phoneE164 = faker.phone.number("+1##########"); // +15551234567

console.log("US Phone:", randomUsPhoneNumber());
console.log("International:", randomInternationalPhone("+44"));
console.log("Digits only:", randomPhoneDigits(10));
console.log("Valid:", isValidUsPhone("(555) 123-4567"));
console.log("Batch:", generatePhoneNumbers(3).join(", "));

[EXPLANATION]

JavaScript uses Math.random() for generating area codes (200-999), exchanges (200-999), and line numbers (1000-9999). padStart() ensures leading zeros. RegExp.test() validates patterns. faker-js library offers faker.phone.number() with custom format strings using # for digits. Array.from() with length creates arrays for batch generation. Template literals provide clean string formatting.

Expected Output

US Phone: (555) 234-5678
International: +44 (555) 234-5678
Digits only: 5551234567
Valid: true
Batch: (234) 567-8901, (345) 678-9012, (456) 789-0123

Common Use Cases

Generate phone numbers for React/Vue user registration forms
Create test data for Node.js contact management APIs
Populate frontend demos with realistic phone numbers
Test phone input validation in web applications
Generate mock data for SMS service testing

Important Notes

padStart(3, "0") pads numbers with leading zeros to 3 digits
faker-js format string: # = any digit (0-9), ! = non-zero digit (1-9)
Array.from() with map function enables functional-style generation
E.164 format (+[country][number]) is recommended for international numbers
RegExp.test() is faster than String.match() for validation

Try Our Interactive Generator

Don't want to write code? Use our free web-based Phone-numbers generator with instant results.

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Other Programming Languages

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C++ $ view --lang=cpp

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RUBY $ view --lang=ruby

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GO $ view --lang=go

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