JSON syntax

JSON syntax rules

• Data is in name/value pairs

"My name" : "Sanjeev"


• Data is separated by commas

{
"name" : "Sanjeev",
"age" : "29",
"registration number" : "1628634"
}


• Curly braces hold objects

{
"name" : "Sanjeev",
"age" : "29",
"registration number" : "1628634"
}


• Square brackets hold arrays

[
{
"name" : "Sanjeev",
"age" : "29"
},
{
"name" : "Ranju",
"age" : "25"
},
{
"name" : "Anand",
"age" : "16"
},
{
"name" : "Richa",
"age" : "20"
}
]

• A name/value pair consists of 
  a field name or key (in double quotes),
  followed by a colon,
  followed by a value.
  
  { "name" : "Sanjeev" }

Types of Values in JSON

In JSON, values must be one of 
the following data types:

• a string (Strings in JSON must be written in double quotes)
{
"age" : "27" 
}

• a number
{
"age" : 27 
}

• an object (JSON object)
{
"age" : { "original" : "27",
"fake" : "26" } 
}

• an array
{
"age" : [ {"original" : "27", "fake" : "26"},
{"original" : "20", "fake" : "24"},
{"original" : "88", "fake" : "78"}
] 
}

• a boolean
{
"age" : true 
}

• null
{
"age" : null 
}

JSON Files

• The file type for JSON files is ".json "
• The MIME type for JSON text is
  "application/json"

Use in Sketchware

• Json Object can be converted to Map Variable using the block Json... to Map

• Json Array can be converted to Map List using the block Json... to ListMap