isString(value, [minLength], [maxLength]) Last updated: 23. Oct 2026
Validates that a value is text with at least minLength and at most maxLength characters. Numbers and other non-text values give false, and empty text or text with only white space always gives false. Alias: isStr.
See also: isInteger isNumber isName Example: Create custom API functions Example: Save data to Docly from API-function
Parameters
| Name | Type | Description |
|---|---|---|
| value | object | Value to validate. |
| minLength (optional) | number | Minimum number of characters (inclusive). Default is 1. |
| maxLength (optional) | number | Maximum number of characters (inclusive). Default is no limit. |
Returns
true if the value is text within the length limits, otherwise false.
Example
Code example (JS)
JS is normal JavaScript either running in the browser or on the Docly™ server.let text = "testing";
if (docly.isString(text, 2)) write("String is 2 chars or more!\r");
if (docly.isString(text, 5)) write("String is 5 chars or more!\r");
if (docly.isString(text, 8)) write("String is 8 chars or more!\r");
if (!docly.isString(text, 1, 3)) write("String is not between 1 and 3 chars!\r");Output
The JS code above produces the output shown below:String is 2 chars or more!
String is 5 chars or more!
String is not between 1 and 3 chars!