$id property is making validation fail

[niko874]

Hi everyone,

When I try to validate my json file against my json.schema, I get the following error:

"validation failed for additional property '$id': instance invalid as per false-schema"

However, $id is a reserved property according to the json schema. See here: https://datatracker.ietf.org/doc/html/draft-wright-json-schema-01#section-9.2

How do I make the validator ignore the reserved property '$id' or handle it correctly? Please find my json and my json.schema here:

• MyJsonFile.json
• MyJsonSchema.json

Thanks for the help and best regards.

P.S.: My code looks like this:

char* jsonFilePath = "PathToFile";
char* jsonSchemaPath = "PathToSchema";
BOOL validationResult;
char cValidationErrors[4096];
unsigned int uiLenValErrors = sizeof(cValidationErrors);

ifstream jsonFileStream(jsonFilePath);
ifstream jsonSchemaStream(jsonSchemaPath);

json myJson = json::parse(jsonFileStream);
json myJsonSchema = json::parse(jsonSchemaStream);
json_validator validator; // create validator
validationResult = TRUE;

try {
    validator.set_root_schema(myJsonSchema); // insert root-schema
}
catch (const std::exception& e) {
    std::cerr << "Validation of schema failed, here is why: " << e.what() << "\n";
    return EXIT_FAILURE;
}

/* json-parse the people - API of 1.0.0, default throwing error handler */

for (auto& person : { myJson }) {
    std::cout << "About to validate this person:\n"
        << std::setw(2) << person << std::endl;
    try {
        validator.validate(person); // validate the document - uses the default throwing error-handler
        std::cout << "Validation succeeded\n";
    }
    catch (const std::exception& e) {
        //std::cerr << "Validation failed, here is why: " << e.what() << "\n";
        sprintf_s(cValidationErrors, uiLenValErrors, "Validation for '%s' failed due to: %s\n", person.type_name(), e.what());
        validationResult = FALSE;
    }
}

[pboettch]

*validationResult = TRUE;

is a segfaut, so obviously this is not the code you're running.

[niko874]

Thanks for the hint. I updated the code. It was originally a function-parameter. Now the segfault should not occur

[pboettch]

In your schema in every object you have

      "additionalProperties": false,

So any field mentioned in the json-file which not described by the schema will make validation fail. Hence the "validation failed for additional property '$id': instance invalid as per false-schema".

$id and other reserved words are reserved for schemas only, but not for documents. You can of course use any name you want, but the schema has to accept them.

[niko874]

Thanks for the reply! It is clear to me now that I am just not using the json/json schema rules in the correct way and that it is not an issue with the 'json-schema-validator' module.