use serde_json::json;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    jsonschema::validate(
      // JSON instance to validate
      &json!({
          "name": "John",
          "location": {
               "country": 404
          }
      }),
      // JSON schema
      &json!({
          "properties": {
              "name": {
                  "type": "string"
              },
              "location": {
                  "properties": {
                      "country": {
                          "type": "string"
                      }
                  }
              }
          }
      }),
    ).expect_err("Should fail");
    Ok(())
}
// 404 is not of type ‘string’ at /location/country