Input Mask is a technique used in web development to control the format of user input in form fields.
This technique is useful for fields like phone numbers, dates, credit card numbers, and more, as it guides users guide users to enter information correctly and prevent data errors.
In this blog post, we’ll explore the 10 best open-source Input Mask libraries for JavaScript. The ranking is based on the number of downloads each library received on CSSScript.Com in the previous year.
Let’s get started.
Originally Published June 12 2024, updated Jan 15 2026
1. Basic Phone Input Mask With Pure JavaScript – phone-mask
A really simple JavaScript plugin to make custom masks on phone inputs.
2. Easy Input Mask Component In Vanilla JavaScript & Vue.js – Maska
A small and customizable input mask component for Vanilla JavaScript and Vue.js framework.
Features:
- No dependencies and small size: ~3 Kb gziped
- Vanilla JS version + Vue 2/3, Alpine.js and Svelte integrations
- Works with native and custom inputs
- Custom tokens with modifiers, transform functions and hooks
- Number mask mode: easy money formatting
- Dynamic, reversed and eager masks
3. Money(Currency) Mask Library In Vanilla JavaScript – SimpleMaskMoney
A vanilla JavaScript input mask library that masks data entry in an input field in the form of money. Supports custom prefix, suffix, decimal/thousand separators as well as precision.
4. Easy Telephone Number Input Mask JavaScript Library – phonemask
Just another telephone input mask JavaScript library that automatically formats telephone numbers typed in a tel input field.
5. Feature-rich Input Mask Plugin With Vanilla JavaScript – imaskjs
A vanilla JavaScript input mask plugin that enables users to enter data in a certain format.
Currently supports 6 mask types: date, number, Pattern, Regex, Function, and Dynamic. Also works with Angular, React, React Native, and Vue.js.
6. Lightweight Input Masking for Web Devs – Masky.js
Masky.js lets you create various input masks. You can easily add prefixes and suffixes to your masks, and set up dynamic formatting to handle different input needs. Need to validate Brazilian CPF or CNPJ numbers? Masky.js has you covered with native validation support for these document types.
In addition, the library dynamically sets the inputmode attribute, optimizing the keyboard layout for mobile users based on the mask. It also calculates and applies minlength and maxlength attributes based on your mask, reducing boilerplate and improving form validation.
7. Lightweight Form Validation and Input Masking/Formatting – Masker.js
A lightweight, dependency-free JavaScript library that provides declarative input masking and validation for HTML forms.
Features:
- Input masking for phone numbers across 12 international formats (US, UK, FR, DE, JP, IN, CN, KR, BR, AR, AU, DSN)
- Date input formatting with both civilian and military date formats
- Character counting with visible or hidden counters for text areas and input fields
- Email format validation with faux masking capabilities
- Number-only input filtering
- Single-field validation for required fields, date formats, and email addresses
- Cross-field date range validation for start and end date pairs
- Custom error messaging through data attributes
8. Developer-friendly Input Mask & Validation Library – smask
A developer-friendly input mask JavaScript library that helps format & validate values (like currency values, and phone numbers) as a user types in an input field.
9. Lightweight Pure JavaScript Input Mask
A pure JavaScript library to make masks on input fields for better number entering like phone number, SSN, date & time , etc.
10. Multifunctional Input Mask Library – Text Mask
A lightweight yet multifunctional input mask library which can be implemented in vanilla JavaScript and React/AngularJS/Vue applications.
