Welcome to Json-Guide

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate.

Comments

---

Comments are not Supported in JSON 😃

Json Syntax

---

Json data types:

• a string
• a number
• an object (JSON object)
• an array
• a boolean
• null

Json number types:

• Integer
• Fraction
• Exponent

Json Objects:

{
"developer":{ "name":"Rafi", "age":20, "city":"Barisal" }
}

Json Array:

{
"developer":[ "Rafi", "Dhaka", "Bangladesh" ]
}

Json Strings:

{ "name":"Rafi" }

Json Numbers:

{ "year": 2017 }

Json Booleans:

{ "name": true }

Json Null:

{ "name": null }

Example showing array containing multiple objects:

{
   "devlopers": [
      { "name":"nahid" , "skill":"laravel" },
      { "name":"rid" , "skill":"php" },
      { "name":"rafi" , "skill":"html" }
   ]
}

Json Objects

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Json Object Syntax:

{ "name":"rafi", "age":10, "class":null, "year": true }

Json Accessing Object Values:

obj = { "name":"rafi", "age":10, "class":null, "year": true };
myobj= obj.name;

or

obj = { "name":"rafi", "age":10, "class":null, "year": true };
myobj= obj["name"];

Json Looping Object:

loopobj = { "name":"rafi", "age":10, "class":null, "year": true };
for (x in loopobj) {
    document.getElementById("demo").innerHTML += x;
}

or

loopobj = { "name":"rafi", "age":10, "class":null, "year": true };
for (x in loopobj) {
    document.getElementById("demo").innerHTML += loopobj[x];
}

Json Nested Objects:

Nesobj = {
    "name":"nahid",
    "age":30,
    "skill": {
        "skill1":"laravel",
        "skill2":"php",
        "skill3":"js",
        "skill4":"vue.js"
    }
 }

Access nested Json objects

 x = nesobj.skill.skill3;

or

x = nesobj.skill["skill3"];

Json Arrays

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Arrays in Json Objects:

arrobj = {
"name":"Rafi",
"phone":01723*****,
"address": "Dhaka, Bangladesh",
"skill":[ "php", "html", "css", "javascript" ]
}

Access Array Values

x = arrobj.skill[0];

Json Looping array:

for (i in arrobj.skill) {
    x += arrobj.skill[i];
}

or

for (i = 0; i < arrobj.skill.length; i++) {
    x += arrobj.skill[i];
}

Json Nested arrays:

nesarr = {
    "name":"Rafi",
    "age":10,
    "year":2017,
    "computer": [
        { "name":"MacBook Pro ", "models":[ "MacBookPro14,1", "MacBookPro14,2", "MacBookPro14,3" ] },
        { "name":"dell", "models":[ "XPS 13", "XPS 15", "XPS 13 2-in-1" ] },
        { "name":"fujitsu", "models":[ "LH-532", "LH-531" ] }
    ]
 }

Access Nested array Values

for (i in nesarr.computer) {
   x += "<p>" + nesarr.computer[i].name + "</p>";
   for (j in nesarr.computer[i].models) {
       x += nesarr.computer[i].models[j];
   }
}

Json Modify array Values:

nesarr.computer[1] = "XPS 17"

Json Delete array:

delete nesarr.computer[1];

Json parse

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Json Parsing

'{ "name":"Rafi", "Phone":01723, "city":"Dhaka"}'

Use the JavaScript function Json parse

var json = '{"name":"rafi", "result":true,"count":2}',
obj = JSON.parse(json);

Use the JavaScript object

<h1 id="demo"></h1> 
<script>
document.getElementById("demo").innerHTML = json.name + ", " + json.city; 
</script>

get data from the server:

var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        var myObj = JSON.parse(this.responseText);
        document.getElementById("demo").innerHTML = obj.name;
    }
};
xmlhttp.open("GET", "json_demo.txt", true);
xmlhttp.send();

Json stringify

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Json Stringify with JavaScript Object:

var myobj = { "name":"Rafi", "hometown":"Barisal", "currentcity":"Dhaka", "phone":01723****};

JavaScript function JSON.stringify, and string data sent to be a server

var myJSON = JSON.stringify(myobj);
document.getElementById("demo").innerHTML = myJSON;

Json Stringify date:

var myobj = { "name":"Rafi", "date":new Date(), "home":"Barisal" };

Json Stringify function:

var myobj = { "name":"Rafi", "phone":function () {return 01723***;}, "home":"Barisal" };

JSON Schema

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Building a product schema:

JSON data for a product API

{
    "id": 1,
    "name": "Ace Plus",
    "price": 12.50,
    "tags": ["medicine", "drug"]
}

Starting the schema

{
   "$schema": "http://json-schema.org/draft-06/schema#",
   "title": "Product",
   "description": "A product from Medicine",
   "type": "medicine"
}

Defining the properties:

what is id?

{
   "$schema": "http://json-schema.org/draft-06/schema#",
   "title": "Product",
   "description": "A product from Medicine",
   "type": "object",
   "properties": {
         "id": {
            "description": "The unique indentifier for a product",
            "type": "integer"
         }
     },
    "required": ["id"]
}

Is name required?

{
   "$schema": "http://json-schema.org/draft-06/schema#",
   "title": "Product",
   "description": "A product from Medicine",
   "type": "object",
   "properties": {
         "id": {
             "description": "The unique identifier for a product",
             "type": "integer"
         },
         "name": {
              "description": "Name of the product",
              "type": "string"
         },
         "required": ["id","name"]
}

Can price be 0?

{
    "$schema": "http://json-schema.org/draft-06/schema#",
    "title": "Product",
    "description": "A product from Acme's catalog",
    "type": "object",
    "properties": {
        "id": {
            "description": "The unique identifier for a product",
            "type": "integer"
        },
        "name": {
            "description": "Name of the product",
            "type": "string"
        },
        "price": {
            "type": "number",
            "exclusiveMinimum": 0
        }
    },
    "required": ["id", "name", "price"]
}

Are all tags strings?

{
    "$schema": "http://json-schema.org/draft-06/schema#",
    "title": "Product",
    "description": "A product from Acme's catalog",
    "type": "object",
    "properties": {
        "id": {
            "description": "The unique identifier for a product",
            "type": "integer"
        },
        "name": {
            "description": "Name of the product",
            "type": "string"
        },
        "price": {
            "type": "number",
            "exclusiveMinimum": 0
        },
        "tags": {
            "type": "array",
            "items": {
                "type": "string"
            },
            "minItems": 1,
            "uniqueItems": true
        }
    },
    "required": ["id", "name", "price"]
}

Summary of products:

[
    {
        "id": 2,
        "name": "An ice sculpture",
        "price": 12.50,
        "tags": ["cold", "ice"],
        "dimensions": {
            "length": 7.0,
            "width": 12.0,
            "height": 9.5
        },
        "warehouseLocation": {
            "latitude": -78.75,
            "longitude": 20.4
        }
    },
    {
        "id": 3,
        "name": "A blue mouse",
        "price": 25.50,
        "dimensions": {
            "length": 3.1,
            "width": 1.0,
            "height": 1.0
        },
        "warehouseLocation": {
            "latitude": 54.4,
            "longitude": -32.7
        }
    }
]

Json-Examples

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JSON with Php

encode

$myArray = array('Name' => 'Tanbir', 'Age' => 22, 'City' => 'Dhaka', 'Job' => 'nai');
echo json_encode($myArray);

decode

$json = '{"Name": "Tanbir","Age": 22,"City": "Dhaka","Job": "nai"}';
var_dump(json_decode($json));

JSON with Python

encode

data = [ { 'Name' : 'Rafi', 'Age' : 8, 'City' : 'Dhaka', 'Job' : 'nai'} ]
json = demjson.encode(data)
print json

decode

json = '{"html":5,"css":3,"laravel":5.5}';
text = demjson.decode(json)
print  text

JSON with Java

encode

class JsonEncodeDemo {

   public static void main(String[] args){
      JSONObject obj = new JSONObject();

      obj.put("name", "rafi");
      obj.put("number", new Integer(01723));
      obj.put("balance", new Double(123450.21));
      obj.put("ip", new Boolean(true));

      System.out.print(obj);
   }
}

decode

String jsonString = "{\"stat\":{\"sdr\": \"aa:bb:cc:dd:ee:ff\",\"rcv\": \"aa:bb:cc:dd:ee:ff\",\"time\": \"UTC in millis\",\"type\": 1,\"subt\": 1,\"argv\": [{1,2},{2,3}]}}";
JSONObject jsonObject = new JSONObject(jsonString);
JSONObject newJSON = jsonObject.getJSONObject("stat");
System.out.println(newJSON);

License

Admin

Tanbir

Contributors

contributors