What is JSON Schema Draft-07?

Draft-07 (published 2018) is the most widely adopted version of the JSON Schema specification. It introduced conditional keywords like if/then/else, the readOnly and writeOnly annotations, and the contentMediaType/contentEncoding keywords. Most major validation libraries — including Ajv, jsonschema (Python), and everit-json-schema (Java) — fully support Draft-07.

// JSON Schema Draft-07 example
{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "name":  { "type": "string", "minLength": 1 },
    "email": { "type": "string", "format": "email" },
    "age":   { "type": "integer", "minimum": 0, "maximum": 150 }
  },
  "required": ["name", "email"],
  "additionalProperties": false
}

// Node.js — validate with ajv
import Ajv from "ajv";
const ajv = new Ajv();
const valid = ajv.validate(schema, data);
if (!valid) console.log(ajv.errors);

Common use cases

Draft-07 validation is used in CI/CD pipelines to validate configuration files, in API gateways to reject malformed requests, in form builders to enforce input rules, and in data engineering to validate records before loading into warehouses. Catching schema violations early prevents runtime errors and data corruption downstream.