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wtf is inputmask?

thorn0/inputmask — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2026-06-02

Audience · developerComplexity · 2/5MaintainedSetup · easy

TL;DR

Inputmask is a JavaScript library that auto-formats what users type into form fields, like adding dashes to a phone number as you type.

Mindmap

mindmap
  root((Inputmask))
    What it does
      Formats typed input
      Enforces patterns
      Cleaner form data
    How it works
      Pattern symbols
      Digit and letter rules
      HTML attributes
    Use cases
      Phone numbers
      Dates and cards
      Postal codes
    Audience
      Founders
      PMs
      Freelancers
    Features
      Optional mask parts
      Dynamic masks
      RTL support

Code map

Detail Auto

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filefunction / class

Why would anyone build with this?

REASON 1

Format phone number fields so dashes and parentheses appear automatically as the user types.

REASON 2

Restrict a form field to only accept dates, credit card numbers, or postal codes in the right shape.

REASON 3

Add formatting to an input field using only HTML attributes, without writing JavaScript.

REASON 4

Reduce signup or checkout form abandonment by guiding users toward the correct input format.

What's in the stack?

JavaScriptjQuerywebpack

How it stacks up

thorn0/inputmask0verflowme/alarm-clock0verflowme/seclists
Language—CSS—
Last pushed2026-06-022022-10-032020-05-03
MaintenanceMaintainedDormantDormant
Setup difficultyeasyeasyeasy
Complexity2/52/51/5
Audiencedevelopervibe coderops devops

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 5min

Works via script tag, jQuery, or a bundler like webpack, no build step required for basic use.

Yoink these prompts

Prompt 1
Show me how to add Inputmask to a phone number field with the pattern (999) 999-9999.
Prompt 2
Help me set up an optional mask section for a phone extension using Inputmask.
Prompt 3
How do I configure Inputmask to read its formatting rules from HTML data attributes instead of JavaScript?
Prompt 4
Walk me through creating a dynamic mask in Inputmask that expands as the user types more digits.

Frequently asked questions

wtf is inputmask?

Inputmask is a JavaScript library that auto-formats what users type into form fields, like adding dashes to a phone number as you type.

Is inputmask actively maintained?

Maintained — commit in last 6 months (last push 2026-06-02).

How hard is inputmask to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is inputmask for?

Mainly developer.

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