Practical JSON Schema examples for required fields, types, enums, arrays, nested objects, and validation workflows.
Use JSON Schema to describe allowed structure and values.
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"name": { "type": "string" },
"active": { "type": "boolean" }
},
"required": ["name", "active"],
"additionalProperties": false
}A good baseline for validating a small payload shape.
{
"type": "object",
"properties": {
"status": {
"type": "string",
"enum": ["draft", "published", "archived"]
}
},
"required": ["status"]
}Enums are useful for states, roles, and constrained option lists.
{
"type": "array",
"items": {
"type": "object",
"properties": {
"id": { "type": "integer" },
"email": { "type": "string", "format": "email" }
},
"required": ["id", "email"]
}
}Use `items` to define the shape of each array element.
Run JSON Schema validation from common tooling.
npx ajv-cli validate -s schema.json -d data.jsonA convenient Node-based workflow for JSON Schema validation.
npx ajv-cli validate -s schema.json -d 'fixtures/*.json'Useful in CI or fixture validation pipelines.