Angular forms MaxLengthValidator Directive

Last Updated : 23 Jul, 2025

In this article, we are going to see what is MaxLengthValidator in Angular 10 and how to use it. The MaxLengthValidator is used to synchronize a standalone FormControl instance to a form control element

<input maxLength ="number">

Exported from:

  • ReactiveFormsModule
  • FormsModule

Selectors:

  • [maxlength] [formControlName]
  • [maxlength] [formControl]
  • [maxlength] [ngModel]

Approach: 

  • Create the Angular app to be used
  • In app.component.html set maxLength to input so when you are putting data in that input element you cannot exceed the max constantly.
  • Serve the angular app using ng serve to see the output.
 

Example:

app.component.html 
<span>GeeksforGeeks</span>
<input type="text" maxlength="12">
<input maxlength="5">

Output:

Reference: https://v17.angular.io/api/forms/MaxLengthValidator

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