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(
'{"GeeksforGeeks" : "A Computer Science portal for Geeks"}'));
|
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(
{GeeksforGeeks : "A Computer Science portal for Geeks"}));
|
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