Underscore.js _.isJSON() Method
The _.isJSON() method checks whether the given value is a valid JSON or not and returns the corresponding boolean value.
Syntax:
_.isJSON( value );
Parameters:
- value: Given value to be checked for JSON.
Return Value: This method returns a Boolean value(Returns true if the given value is valid JSON, else false).
Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed. Underscore.js contrib library can be installed using npm install underscore-contrib.
Example 1:
Javascript
// Defining underscore contrib variable var _ = require( 'underscore-contrib' ); // Checking console.log( "The Value is JSON : " +_.isJSON( '{"w3wiki" : "A Computer Science portal for Beginner"}' )); |
Output:
The Value is JSON : true
Example 2: For mapping false will be returned.
Javascript
// Defining underscore contrib variable var _ = require( 'underscore-contrib' ); // Checking console.log( "The Value is JSON : " +_.isJSON( {w3wiki : "A Computer Science portal for Beginner" })); |
Output:
The Value is JSON : false
Example 3: For other values, this method returns false.
Javascript
// Defining underscore contrib variable var _ = require( 'underscore-contrib' ); // Checking console.log( "The Value is JSON : " + _.isJSON([ "gfg" ])); |
Output:
The Value is JSON : false
Contact Us