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
 
https://youtu.be/LsDiwYYZ7JQ
 
http://www.sketchwarehelp.com/2018/06/json-syntax.html