java script json

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JSON is a lightweight data format used to store and transport data between a server and web page. It stands for JavaScript Object Notation. JSON syntax follows JavaScript object syntax rules - data is in name/value pairs within curly braces for objects and square brackets for arrays. When exchanging data between a browser and server, it can only be text, so JSON text can be converted to JavaScript objects on the browser and back, allowing work with data as JavaScript objects without parsing. Arrays in JSON hold multiple objects within square brackets.

JavaScript JSON
Prof. Neeraj Bhargava
Kapil Chauhan
Department of Computer Science
School of Engineering & Systems Sciences
MDS University, Ajmer

JavaScript JSON
 JSON is a format for storing and transporting data.
 JSON is often used when data is sent from a server to a
web page.

What is JSON?
 JSON stands for JavaScript Object Notation
 JSON is a lightweight data interchange format
 JSON is "self-describing" and easy to understand

Exchanging Data
 When exchanging data between a browser and a server,
the data can only be text.
 JSON is text, and we can convert any JavaScript object into
JSON, and send JSON to the server.
 We can also convert any JSON received from the server into
JavaScript objects.
 This way we can work with the data as JavaScript objects,
with no complicated parsing and translations.

JSON Syntax Rules
 Data is in name/value pairs
 Data is separated by commas
 Curly braces hold objects
 Square brackets hold arrays

JSON Data - A Name and a Value
 JSON data is written as name/value pairs, just like
JavaScript object properties.
 A name/value pair consists of a field name (in double
quotes), followed by a colon, followed by a value:
 "firstName":"John"

JSON Objects
 JSON objects are written inside curly braces.
 Just like in JavaScript, objects can contain multiple
name/value pairs:
 {"firstName":"John", "lastName":"Doe"}

JSON Arrays
 JSON arrays are written inside square brackets.
 Just like in JavaScript, an array can contain objects:
 "employees":[
{"firstName":"John", "lastName":"Doe"},
{"firstName":"Anna", "lastName":"Smith"},
{"firstName":"Peter", "lastName":"Jones"}
]

Converting a JSON Text to a
JavaScript Object
 A common use of JSON is to read data from a web server, and display
the data in a web page.
 For simplicity, this can be demonstrated using a string as input.
 First, create a JavaScript string containing JSON syntax:
var text = '{ "employees" : [' +
'{ "firstName":"John" , "lastName":"Doe" },' +
'{ "firstName":"Anna" , "lastName":"Smith" },' +
'{ "firstName":"Peter" , "lastName":"Jones" } ]}';
 Then, use the JavaScript built-in function JSON.parse() to convert the
string into a JavaScript object:
var obj = JSON.parse(text);

Assignment
 Explain JavaScript JSON with example and describe
following
 Syntax rule
 Exchanging data
 JSON Array

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java script json

1. JavaScript JSON Prof. Neeraj Bhargava Kapil Chauhan Department of Computer Science School of Engineering & Systems Sciences MDS University, Ajmer

2. JavaScript JSON  JSON is a format for storing and transporting data.  JSON is often used when data is sent from a server to a web page.

3. What is JSON?  JSON stands for JavaScript Object Notation  JSON is a lightweight data interchange format  JSON is "self-describing" and easy to understand

4. Exchanging Data  When exchanging data between a browser and a server, the data can only be text.  JSON is text, and we can convert any JavaScript object into JSON, and send JSON to the server.  We can also convert any JSON received from the server into JavaScript objects.  This way we can work with the data as JavaScript objects, with no complicated parsing and translations.

5. JSON Syntax Rules  Data is in name/value pairs  Data is separated by commas  Curly braces hold objects  Square brackets hold arrays

6. JSON Data - A Name and a Value  JSON data is written as name/value pairs, just like JavaScript object properties.  A name/value pair consists of a field name (in double quotes), followed by a colon, followed by a value:  "firstName":"John"

7. JSON Objects  JSON objects are written inside curly braces.  Just like in JavaScript, objects can contain multiple name/value pairs:  {"firstName":"John", "lastName":"Doe"}

8. JSON Arrays  JSON arrays are written inside square brackets.  Just like in JavaScript, an array can contain objects:  "employees":[ {"firstName":"John", "lastName":"Doe"}, {"firstName":"Anna", "lastName":"Smith"}, {"firstName":"Peter", "lastName":"Jones"} ]

9. Converting a JSON Text to a JavaScript Object  A common use of JSON is to read data from a web server, and display the data in a web page.  For simplicity, this can be demonstrated using a string as input.  First, create a JavaScript string containing JSON syntax: var text = '{ "employees" : [' + '{ "firstName":"John" , "lastName":"Doe" },' + '{ "firstName":"Anna" , "lastName":"Smith" },' + '{ "firstName":"Peter" , "lastName":"Jones" } ]}';  Then, use the JavaScript built-in function JSON.parse() to convert the string into a JavaScript object: var obj = JSON.parse(text);

10. Assignment  Explain JavaScript JSON with example and describe following  Syntax rule  Exchanging data  JSON Array

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