JSON Schema - Data validation language

JSON Schema is a data validation language created in 2010 by Kris Zyp.

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JSON Schema is a vocabulary that allows you to annotate and validate JSON documents.

JSON Schema website
JSON Schema is developed on GitHub and has 2,623 stars
JSON Schema first developed in https://github.com/json-schema-org
json-schema.org was registered in 2007
See also: (1 related languages)Livr
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Example from the web:

{
  "$id": "https://example.com/calendar.schema.json",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "description": "A representation of an event",
  "type": "object",
  "required": [ "dtstart", "summary" ],
  "properties": {
    "dtstart": {
      "type": "string",
      "description": "Event starting time"
    },
    "dtend": {
      "type": "string",
      "description": "Event ending time"
    },
    "summary": {
      "type": "string"
    },
    "location": {
      "type": "string"
    },
    "url": {
      "type": "string"
    },
    "duration": {
      "type": "string",
      "description": "Event duration"
    },
    "rdate": {
      "type": "string",
      "description": "Recurrence date"
    },
    "rrule": {
      "type": "string",
      "description": "Recurrence rule"
    },
    "category": {
      "type": "string"
    },
    "description": {
      "type": "string"
    },
    "geo": {
      "$ref": "https://example.com/geographical-location.schema.json"
    }
  }
}