ALEXJSONValidation

An Objective-C class to validate the output of NSJSONSerialization against a JSON Schema (http://json-schema.org).

API

ALEXJSONValidation has a single class method that does everything for you:

@interface ALEXJSONValidation : NSObject

+ (BOOL)validateJSONObject:(id)object forSchemaAtURL:(NSURL*)schemaURL options:(ALEXJSONValidationOptions)options error:(NSError**)error;

@end

You just pass it the return value of -[NSJSONSerialization JSONObjectWithData:options:error:] and you're done.

Examples

This example validates the base json schema against the hyper schema. It's actually one of the included tests.

NSError *inputError;
NSURL *url = [NSURL URLWithString:@"http://json-schema.org/schema"];
NSData *data = [NSData dataWithContentsOfURL:url options:0 error:&inputError];
if (!data) {
	STFail(@"error fetching input data: %@", inputError);
}
NSDictionary *obj = [NSJSONSerialization JSONObjectWithData:data options:0 error:&inputError];
if (!obj) {
	STFail(@"error deserializing json: %@", inputError);
}

NSURL *schemaURL = [NSURL URLWithString:@"http://json-schema.org/hyper-schema"];

NSError *validationError;
BOOL success = [ALEXJSONValidation validateJSONObject:obj forSchemaAtURL:schemaURL options:0 error:&validationError];
STAssertTrue(success, @"error: %@", validationError);

You could similarily use it to validate the responseJSON of an AFJSONRequestOperation.

Status

Currently passes most of the tests of the JSON Schema Test Suite (https://github.com/json-schema/JSON-Schema-Test-Suite) for draft 3 of the specification, but some big ones are still missing.

Known Bugs: doesn't generate NSErrors when validation fails yet.

License

Will be open sourced later. For now: © 2013 Alexander Kempgen, all rights reserved.

Version History

No stable releases.