What are JSON Web Tokens? JWT Authorization Tutorial

What are JSON Web Tokens? JWT Authorization Tutorial

In this JSON Web tokens or JWT Authorization tutorial, you’ll learn what JSON Web Tokens are and how exactly it’s used, specifically in the context of securing web applications. JWT is a very popular way to do user authorization in web apps today. JWT has also become very popular in the context of micro services and some of the other developments in the way we build web applications today. Understanding JSON Web Tokens Authorization

JSON Web tokens or JWT is a very popular way to do user authorization in web apps today. JWT has also become very popular in the context of micro services and some of the other developments in the way we build web applications today. In this tutorial, you’ll learn what JWT is and how exactly it’s used, specifically in the context of securing web applications.

JSON Tutorial For Beginners | What is JSON | Learning JSON with JavaScript

JSON Tutorial For Beginners | What is JSON | Learning JSON with JavaScript

JSON Tutorial For Beginners | What is JSON | Learning JSON with JavaScript

Explore JSON and how JavaScript Objects can be used to access data within JSON data format and output to your web page

Guide to learning how to use JavaScript Objects and JSON data. JSON is the most popular format for data exchange between applications. If you are interested in connected to a web API chances are its JSON formatted. Learn to use AJAX to connect and bring JSON data into your JavaScript!

This course shows you how to work with JSON formatted data, output content, loop JSON data, Parse JSON and a whole lot more.

JSON (JavaScript Object Notation) is a syntax for data. JSON is easier to use than XML and human readable. Most modern web APIs output data in JSON formats. It's a lightweight data interchange format that is quickly becoming the default format for data exchange on internet today! JSON is lightweight, language independent and easy to read and write. JSON is better than XML and more popular!

Within the lessons of this course we will explore

  • JavaScript data types used to hold variables and how they work
  • JSON and how to write JSON data
  • How to add values into a JSON object
  • Accessing JSON data and bringing it into JavaScript
  • JavaScript JSON parse and stringify methods
  • Adding JSON to local storage
  • Retrieving back data within JSON formats, updating and working with JSON
  • Connecting to a web API using fetch
  • Retrieving JSON data from a web API and outputting the results into your web page
  • Iterating threw multiple results from an API
  • Google Spreadsheet data as JSON and how to practice retrieving data
  • All of the source code and resources are in included
  • Explore different methods of working with the JSON data stringify and parsing
  • How JavaScript objects can use Arrays to hold multiple items
  • How JavaScript arrays work and store data

Thanks for reading

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Further reading about JavaScript and JSON

The Complete JavaScript Course 2019: Build Real Projects!

JavaScript Programming Tutorial | Full JavaScript Course for Beginners 2019

The complete beginner’s guide to JSON

The Complete Guide to JSON Web Tokens

JWT Fundamentals for Beginners

Best JavaScript Frameworks, Libraries and Tools to Use in 2019

New ES2019 Features Every JavaScript Developer Should Know

Javascript | How To Covert Javascript Array To JSON

Javascript | How To Covert Javascript Array To JSON

In this example, we will see How To Covert Javascript Array To JSON. We can convert Javascript array to json using JSON.stringify() method. At some point in your time, whatever developer you are, you need to deal with JSON data. JSON stands for Javascript Object Notation. Exchange data between client and server is straightforward using JSON.

In this example, we will see How To Covert Javascript Array To JSON. We can convert Javascript array to json using JSON.stringify() method. At some point in your time, whatever developer you are, you need to deal with JSON data. JSON stands for Javascript Object Notation. Exchange data between client and server is straightforward using JSON.

How To Covert Javascript Array To JSON

Javascript JSON.stringify() method converts Javascript array to json, and then we can send the string to the server.

Javascript JSON.stringify() is the inbuilt function in which it allows us to take the JavaScript Object or Array and create a JSON string out of it.

JSON.stringify() converts the value to JSON notation representing it:

If a value has the toJSON() method, it’s responsible for defining what data will be serialized.

See the following example.


// app.js

let data = [
  'krunal',
  'ankit',
  'rushabh'
]
jsonData = JSON.stringify(data)
console.log(jsonData)
console.log(typeof jsonData === 'string')

Output


➜  es git:(master) ✗ node app
["krunal","ankit","rushabh"]
true
➜  es git:(master) ✗

In the above code, we have defined a Javascript array with three values and then convert it into a JSON string using JSON.stringify() method.

Then we have printed JSON data in the console and check if the typeof jsondata is a string or not. Of course, it will return true because it is now JSON string ready to send the server via AJAX request. You can use the Axios library to send a network request.

JavaScript Object to JSON

We can use the same JSON.stringify() function to convert the Javascript object to json.

// app.js

let obj = {
  name: 'Krunal',
  rollno: 10,
  site: 'AppDividend'
}
jsonData = JSON.stringify(obj)
console.log(jsonData)
console.log(typeof jsonData === 'string')

Output

➜  es git:(master) ✗ node app
{"name":"Krunal","rollno":10,"site":"AppDividend"}
true
➜  es git:(master) ✗

We have defined an object and then pass to JSON.stringify() method, and it converts from Javascript object to json string.

Often, you need to convert the JavaScript values like string, array, or object into JSON before AJAX POST request.

The JSON object is now part of most modern web browsers (IE 8 & above).

Conclusion

We can convert Javascript datatypes like Number, Array, Object to JSON with just one function, and it is beneficial when exchanging data between client and server.

JavaScript | Convert JSON String to JSON Object

JavaScript | Convert JSON String to JSON Object

Convert JSON string to JSON object javascript. This tutorial is the purpose to explain the best ways and examples for convert JSON string to a JSON object.

Convert JSON String to JSON Object JavaScript.

You can use the javascript JSON.parse() method, to convert a JSON string into a JSON object. JSON is a commonly used data format for exchanging data between a server and web applications. It can be used in various ways and this tutorial is the purpose to show you the best examples for convert JSON string to a JSON object.

Syntax of JSON.parse() Method

JSON.parse(text[, reviver]);

Example 1 – javascript json string to json object

Let, if you have a json string like ” ‘'{"name":"John", "age":30, "city":"New York"}'’ “, you want to convert into json object. You can use the below example:

var txt = '{"name":"John", "age":30, "city":"New York"}'
var obj = JSON.parse(txt);

console.log(obj);

Example 2 – Converting JSON text to JavaScript Object

If you want to extract the object value from the JSON object in javascript. So you can extract look like below:

var myStrObj = '{"name":"John", "age":30, "city":"New York"}';
 
var name = JSON.parse(myStrObj.name);
 
document.write('Result of the above code is:-' + name);
 
console.log(name);

Result of the above code is:-Name:-John

Example 3 – Parse JSON Object & Extract Multiple Objects JavaScript

Now we will take the next example, here we will convert json string to objects and extract and display multiple objects:

var myStrObj = '{"name":"John", "age":30, "city":"New York"}';
 
var myJsonObj = JSON.parse(myStrObj);
 
document.write('Result of the above code is:-' + 'Name:-'+ myJsonObj.name + ' Age:-'+ myJsonObj.age);

Result of the above code is:-Name:-John Age:-30