May 08, 2021 JSON
The JSON pattern is a specification that defines the JSON data structure based on the JSON format. I t was written under the draft IETF and expired in 2011. JSON mode:
There are several validators available for different programming languages. But the most complete and compatible JSON-compatible validator today is the JSV.
| Language | The library |
|---|---|
| C | WJElement (LGPLv3) |
| Java | json-schema-validator (LGPLv3) |
| .NET | Json.NET (MIT) |
| ActionScript 3 | Frigga (MIT) |
| Haskell | aeson-schema (MIT) |
| Python | Jsonschema |
| Ruby | autoparse (ASL 2.0); r uby-jsonschema (MIT) |
| Php | php-json-schema (MIT). j son-schema (Berkeley) |
| Javascript | Orderly (BSD); J SV; j son-schema; M atic (MIT); D ojo; P ersevere (modified BSD or AFL 2.0); s chema.js. |
Here's a basic JSON pattern that covers a classic 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 take a look at the various important keywords that can be used in this pattern:
| Keywords | Describe |
|---|---|
| $schema | $schema the keyword status to indicate that the pattern is consistent with the draft v4 specification. |
| title | Use it to provide a title for our pattern. |
| description | A description of the pattern. |
| type | The type keyword defines the first constraint on our JSON data: it must be a JSON object. |
| properties | Define the various keys and their value types, as well as the minimum and maximum values used in the JSON file. |
| required | Store a list of necessary properties. |
| minimum | The constraints that are set to the value, which represent the minimum acceptable value. |
| exclusiveMinimum | If "exclusiveMinimum" exists and has a Boolean value true, the instance is valid if it is strictly greater than the value "minimum". |
| maximum | The constraints that are set to the value, representing the maximum acceptable value. |
| exclusiveMaximum | If "exclusiveMinimum" exists and has a Boolean value true, the instance is valid if it is strictly less than "maximum". |
| multipleOf | If the result of splitting an instance by the value of this keyword is a number, the digital instance next to "multipleOf" is valid. |
| maxLength | The maximum length value of the string instance character. |
| minLength | The minimum length value of the string instance character. |
| pattern | If the regular expression matches the instance successfully, the string instance is considered valid. |
You can http://json-schema.org list of keywords that you can use to define the JSON pattern on the http://json-schema.org of the list. The above pattern can be used to test the validity of the JSON code given below:
[
{
"id": 2,
"name": "An ice sculpture",
"price": 12.50,
},
{
"id": 3,
"name": "A blue mouse",
"price": 25.50,
}
]