Divergent outcomes when using JSON.stringify(object) versus converting object to a string in JavaScript

Question

Divergent outcomes when using JSON.stringify(object) versus converting object to a string in JavaScript

Within my code, there exists an array of strings and a productId, which is an object of type ObjectId.

productIds = [ '61b8b4a7ebffe000ec619219', '61c08d910579b11c103ba3b5' ];

productId = 61b8b4a7ebffe000ec619219;

The productId is extracted from MongoDB and is of type Object.Schema.ObjectId.

My objective is to determine if productId exists within productIds. Therefore, I need to convert/parse the productId into a string.

I am puzzled by the fact that the following code results in true

productIds.includes(String(productId))
productIds[0] === String(productId)

Whereas, the code below gives false

productIds.includes(JSON.stringify(productId))
productIds[0] === JSON.stringify(productId)

Below are the outcomes of my testing different approaches

[ '61b8b4a7ebffe000ec619219', '61c08d910579b11c103ba3b5' ] | 61b8b4a7ebffe000ec619219 is type of object

productIds.includes(String(orderedProduct._product) true
productIds.includes(JSON.stringify(orderedProduct._product)) false

61b8b4a7ebffe000ec619219 is a typeof object 61b8b4a7ebffe000ec619219 is a typeof string
true using string String(61b8b4a7ebffe000ec619219)
false using stringify JSON.stringify(61b8b4a7ebffe000ec619219)

javascript arrays json string stringify

Answer 1

Answer №1

ProductID = 61b8b4a7ebffe000ec619219;

There seems to be a syntax error in the code.

However, looking beyond that:

String function converts the input value to a string.

JSON.stringify function converts the input value to a string containing JSON representation.

In JSON, strings are always enclosed by ".

const data = "foo";

const string = String(data);
const json = JSON.stringify(data);

console.log(string);
console.log(json);

The distinctions among different data types are further highlighted here:

const data = { "an": "object" };

const string = String(data);
const json = JSON.stringify(data);

console.log(string);
console.log(json);

Answer 2

ProductID = 61b8b4a7ebffe000ec619219;

There seems to be a syntax error in the code.

However, looking beyond that:

String function converts the input value to a string.

JSON.stringify function converts the input value to a string containing JSON representation.

In JSON, strings are always enclosed by ".

const data = "foo";

const string = String(data);
const json = JSON.stringify(data);

console.log(string);
console.log(json);

The distinctions among different data types are further highlighted here:

const data = { "an": "object" };

const string = String(data);
const json = JSON.stringify(data);

console.log(string);
console.log(json);

Divergent outcomes when using JSON.stringify(object) versus converting object to a string in JavaScript

Answer №1

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