Validate your JSON documents using our simple and free JSON Schema Draft 4 validation API.

$ curl "https://assertible.com/json" -d'{
  "schema": {"type":"object"},
  "json": {}
}'

{"errors": [], "valid": true}

It's that simple. Try it out by copying the curl command into your terminal.

$ curl "https://assertible.com/json" -d'{
  "schema": {
    "type": "object",
    "properties": {
      "billing_address":  { "$ref": "#/definitions/address" },
      "shipping_address": { "$ref": "#/definitions/address" }
    },
    "definitions": {
      "address": {
        "type": "object",
        "properties": {
          "street_address": { "type": "string" },
          "city":           { "type": "string" },
          "state":          { "type": "string" }
        },
        "required": ["street_address", "city", "state"]
      }
    }
  },
  "json": {
    "shipping_address": {
      "street_address": "1600 Pennsylvania Avenue NW",
      "city": "Washington",
      "state": "DC"
    },
    "billing_address": {
      "street_address": "1st Street SE",
      "city": "Washington",
      "state": "DC"
    }
  }
}'

{"errors":[], "valid": true}

$ curl "https://assertible.com/json" -d'{
  "schema": {
    "type": "object",
    "properties": {
      "foo": { "type": "object" },
      "bar": { "type": "string" }
    },
    "required": [
      "foo"
    ]
  },
  "json": {"bar": [1,2,3]}
}'

{
  "valid": false,
  "errors": [
    "failed to validate required properties\
      - one of `[\"foo\"]` prop(s) missing in `{\"bar\":[1,2,3]}`",
    "Error at .bar: failed to validate type\
      - `[1,2,3]` is not a string"
  ]
}

This API does not support external JSON Schema references. Please submit a chat or send us a message if this is required for your testing purposes. See the JSON Schema API documentation for more details.

This JSON Schema Validation API falls under Assertible's terms of service and is intended for testing and exploratory purposes. We do not make any guarantees about the uptime and availability of the Free JSON Schema Validation API.