Thursday, May 31, 2012

Comparison of JSON Parser for Objective-C (JSON Framework, YAJL, TouchJSON, etc)

As far as I know, there are three JSON Parsers for Objective-C, JSON Framework , YAJL , and Touch JSON . Then, These three would have their own characteristics.

For example:

YAJL can be used as a SAX style parser.

JSON Framework has relatively long history and is widely used.

Touch JSON parses NSData instead of NSString.

In addition, as far as I tested, the result of performance comparison is as follows:

[fast] YAJL > JSON Framework > Touch JSON [slow].

If you know pros and cons of these JSON parsers, could you tell me?

Lastly, if you know any other JSON Parser, please tell me.

Source: Tips4all


  1. I had the same results as you for JSON Framework and TouchJSON. TouchJSON claims to be faster, but my test with parsing one big (10K array objects) JSON string was different, JSON Framework was faster. Didn't know about YAJL.

  2. If you're looking for speed, take a look at JSONKit. It is (usually) much faster than the already mentioned JSON libraries, often an order of magnitude faster. And because of it's "recently instantiated object cache", it will (again, usually) use less memory as well.

  3. There's also this parser:

    I don't remember how I stumbled upon this one, but it looked lightweight and simple, so I thought that it suits my needs. I event forked it in order to add initialization from NSData.
    As I needed to parse small responses, I didn't care about the performance. It would be interesting to know how it performs though.

  4. Considering a comparison that I did, the fastest library is JSONKit, followed by NSJSONSerialization (now public API) and NextiveJSON. SBJSON and TouchJSON are a little bit slower than the previous 3 libraries.

    The comparison has been done using an iPhone 4S with iOS 5.0.1.

  5. Look at this post

  6. JSONKit for performance. Referece: a comprehensive review by

  7. Why not have a look at akosma's benchmarks on parsers where he compares different kinds of parsers. If one parser is missing, you might as well add it to the tests, since his code is open source.

  8. If you are looking for a serializer from NSObject to JSON and vice versa, you might want to checkout