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string

Validate that a value is a string (typeof === 'string'). Companion to Laravel's string rule. Useful when explicit type guarding is needed separately from any other constraint.

Signature​

NguardValidators.String.string: ValidatorFn

A parameterless validator — used directly without invocation.

Reactive forms​

import { FormControl } from '@angular/forms';
import { NguardValidators } from 'ng-nguard';

const note = new FormControl('', [NguardValidators.String.string]);

Template-driven forms​

<input ngModel name="note" nguardString />

Error key​

{ string: true }

Notes​

  • Empty strings pass — '' is still a string.
  • null, undefined, numbers, booleans, objects, arrays all fail.
  • Most other String validators already perform a string-type check internally; reach for string only when you want a pure type assertion separate from any format/length constraint.

See also​

  • notBlank — string and non-empty after trimming
  • minLength — string and at least N characters