SMJJSONPath is a complete JSONPath implementation written in Objective-C. It's a wide adaptation of Jayway JsonPath implementation.

It supports a wide bunch of functionalities:

• dot and square bracket syntax
• inline predicates
• functions
• nesting

You can take a look to the Jayway JsonPath documentation for more information.

This implementation is a tight adaptation of Jayway JsonPath. It respects the original structure and naming, as much as possible. The changes are mainly to be more Objective-C stylized (named parameters, use NSError instead of try-catch-exception, etc.).

This tight adaptation was done for different reasons:

• If I wanted to structure something from my own view, I would have started from scratch, and I wouldn't have done it at all : this is a big bunch of code, tests and reflexion to do, more than I want to give to that.
• The Jayway JsonPath project have a pretty good and complete implementation (with some cleaning here and there to do, which are already documented by original developers). It's a good reference, from my point of view.
• I want to facilitate cherry-picking updates from Jayway JsonPath to include them right here.

This code is currently in sync with the source code in commit 00cfce3.

Simple example:

// Create a SMJJSONPath object
SMJJSONPath *jsonPath = [[SMJJSONPath alloc] initWithJSONPathString:@"$.books..author" error:&error];

// Create a configuration.
SMJConfiguration *configuration = [SMJConfiguration defaultConfiguration];

// Query a JSON document.
NSArray *result = [jsonPath resultForJSONFile:fileURL configuration:configuration error:&error];

// That's all.

You can update a JSON mutable object accordingly to a JSONPath:

// Create a SMJJSONPath object
SMJJSONPath *jsonPath = [[SMJJSONPath alloc] initWithJSONPathString:@"$.books..author" error:&error];

// Create a configuration.
SMJConfiguration *configuration = [SMJConfiguration defaultConfiguration];

// Read a JSON document with mutable containers.
id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];

// Update the json.
[jsonPath updateJSONMutableObject:jsonObject deleteWithConfiguration:configuration error:&error];


// The queried path was deleted in jsonObject.