Skip to content
Related Articles

Related Articles

Improve Article

JSON Schema

  • Last Updated : 22 Jun, 2020
Geek Week

JSON Schema is a content specification language used for validating the structure of a JSON data.It helps you specify the objects and what values are valid inside the object’s properties. JSON schema is useful in offering clear, human-readable, and machine-readable documentation.

Structure of a JSON Schema: Since JSON format contains an object, array, and name-value pair elements. Name-value pairs are used for providing schema processing elements as well as validating the JSON content. Schema processing elements include(not limited to).

  • $schema” To specify the version of JSON schema.
  • title and description: To provide information about the schema.
  • required: It’s an array of elements that indicates which elements should be present.
  • additionalProperties: To indicate whether existence of specified elements are allowed or not.

JSON content definition:

  • When a JSON object is defined, JSON schema uses name-value pair “type”:”object”
  • When arrays are defined, JSON schema uses the name-value pair “type”:”array”


  "$id": "",
  "$schema": "",
  "title": "Voters information",
  "type": "object",
  "properties": {
    "firstName": {
      "type": "string",
      "description": "The person's first name."
    "lastName": {
      "type": "string",
      "description": "The person's last name."
    "age": {
      "description": "Age in years which must be equal to or 
                      greater than eighteen in order to vote.",
      "type": "integer",
      "minimum": 18


  "firstName": "Indra",
  "lastName": "Sen",
  "age": 20

The above JSON schema contains the following:

  • $id keyword
  • $schema keyword
  • title annotation keyword
  • properties validation keyword
  • Three keys: firstName, lastName and age each with their own description keyword.
  • type instance data model (see above)
  • minimum validation keyword on the age key.

Hey geek! The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. But before you tackle the big projects, we suggest you start by learning the basics. Kickstart your web development journey by learning JS concepts with our JavaScript Course. Now at it’s lowest price ever!

My Personal Notes arrow_drop_up
Recommended Articles
Page :