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Underscore.js _.isJSON() Method
  • Last Updated : 30 Jul, 2020

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

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// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Checking
console.log("The Value is JSON : " +_.isJSON(
'{"GeeksforGeeks" : "A Computer Science portal for Geeks"}'));

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Output:

The Value is JSON : true

Example 2: For mapping false will be returned.

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// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Checking
console.log("The Value is JSON : " +_.isJSON(
{GeeksforGeeks : "A Computer Science portal for Geeks"}));

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Output:

The Value is JSON : false

Example 3: For other values, this method returns false.

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// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Checking
console.log("The Value is JSON : " + _.isJSON(["gfg"]));

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Output:

The Value is JSON : false

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