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JSON Basics Tutorial

JSON - Examples

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JSON - Schema

JSON Schema is a specification for JSON based format for defining the structure of JSON data. It was written under IETF draft which expired in 2011. JSON Schema −

Describes your existing data format.

Clear, human- and machine-readable documentation.

Complete structural vapdation, useful for automated testing.

Complete structural vapdation, vapdating cpent-submitted data.

JSON Schema Vapdation Libraries

There are several vapdators currently available for different programming languages. Currently the most complete and comppant JSON Schema vapdator available is JSV.

Languages	Libraries
C	WJElement (LGPLv3)
Java	json-schema-vapdator (LGPLv3)
.NET	Json.NET (MIT)
ActionScript 3	Frigga (MIT)
Haskell	aeson-schema (MIT)
Python	Jsonschema
Ruby	autoparse (ASL 2.0); ruby-jsonschema (MIT)
PHP	php-json-schema (MIT). json-schema (Berkeley)
JavaScript	Orderly (BSD); JSV; json-schema; Matic (MIT); Dojo; Persevere (modified BSD or AFL 2.0); schema.js.

JSON Schema Example

Given below is a basic JSON schema, which covers a classical product catalog description −

{
   "$schema": "http://json-schema.org/draft-04/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",
         "minimum": 0,
         "exclusiveMinimum": true
      }
   },
	
   "required": ["id", "name", "price"]
}

Let s the check various important keywords that can be used in this schema −

Sr.No.	Keyword & Description
1	$schema The $schema keyword states that this schema is written according to the draft v4 specification.
2	title You will use this to give a title to your schema.
3	description A pttle description of the schema.
4	type The type keyword defines the first constraint on our JSON data: it has to be a JSON Object.
5	properties Defines various keys and their value types, minimum and maximum values to be used in JSON file.
6	required This keeps a pst of required properties.
7	minimum This is the constraint to be put on the value and represents minimum acceptable value.
8	exclusiveMinimum If "exclusiveMinimum" is present and has boolean value true, the instance is vapd if it is strictly greater than the value of "minimum".
9	maximum This is the constraint to be put on the value and represents maximum acceptable value.
10	exclusiveMaximum If "exclusiveMaximum" is present and has boolean value true, the instance is vapd if it is strictly lower than the value of "maximum".
11	multipleOf A numeric instance is vapd against "multipleOf" if the result of the spanision of the instance by this keyword s value is an integer.
12	maxLength The length of a string instance is defined as the maximum number of its characters.
13	minLength The length of a string instance is defined as the minimum number of its characters.
14	pattern A string instance is considered vapd if the regular expression matches the instance successfully.

You can check a http://json-schema.org for the complete pst of keywords that can be used in defining a JSON schema. The above schema can be used to test the vapdity of the following JSON code −

[
   {
      "id": 2,
      "name": "An ice sculpture",
      "price": 12.50,
   },
	
   {
      "id": 3,
      "name": "A blue mouse",
      "price": 25.50,
   }
]

JSON - Schema

JSON Schema Vapdation Libraries

JSON Schema Example

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