michalmuskala
Jason: a blazing fast JSON parser and generator in pure Elixir
Hello everybody.
I have just released Jason - a new JSON library.
You might be wondering, why do we need a new library? The primary focus of Jason is speed. And it it fast, really fast, usually twice as fast as Poison on both decoding and encoding and much closer to the performance of jiffy (which is implemented in C) - in some situations even faster.
Another goal was to retain maximal compatibility with Poison, so it could be a drop-in replacement as much as possible. The only places where compatibility was broken were done for speed and in minor features. The documentation outlines those differences, how to remedy them, and how to use Jason with Phoenix, Plug, Ecto, Postgrex and Absinthe.
Both parser and generator fully conform to RFC 8259 and ECMA 404 standards. The parser is tested using JSONTestSuite and some property tests with the wonderful StreamData library.
Source: GitHub - michalmuskala/jason: A blazing fast JSON parser and generator in pure Elixir. · GitHub
Docs: jason v1.4.5 — Documentation
Benchmarks: decode-20-hipe.txt · GitHub, http://michal.muskala.eu/jason/decode.html and http://michal.muskala.eu/jason/encode.html
PS. I’m planning on writing a blog post about how I made it this fast 
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michalmuskala
After over 1.5k downloads from hex and no complaints about any major bugs or issues, I’ve decided to release version 1.0. There were no breaking changes since the rc releases. If you were considering the stability or production readiness of the library to give it a try, now it’s a good time to do it 
.
Current plans for 1.1 include support for pretty printing. Since there’s a pull request already opened, I expect it to land pretty soon.
michalmuskala
There are two problems with HiPE. One is that switching between HiPE and BEAM is expensive. The other is that HiPE is generally much less tested and developed outside of the OTP team. Because of that there are sometimes stability problems and other issues. That’s primarily why many discourage use of HiPE. That said, when compiled with HiPE, all the property tests that we have in Jason pass without issues, so I’m as certain as I can be we hit no bugs.
Going back to the first problem with HiPE. As long as you’re staying within HiPE code, all is fine. Switching between BEAM and HiPE (so calling a module that was not compiled with HiPE from a HiPE-compiled module) requires shuffling registers and serialising some state - that’s why it’s expensive.
The design of Jason is such, that if you compile our main modules with HiPE, we should do a minimal amount of switches. This is especially true of the parser - it never switches out of the Jason.Decoder module, other than at the end with the final result. This is very efficient. The encoder calls the protocol for any non-standard data types, so the switch back-and-forth would occur there. I haven’t really played with it, but we could make sure that if the encoder is compiled with HiPE, all the derived protocol implementations are as well - this should mostly alleviate the issue.
I haven’t looked into making HiPE compilation an easy option right now, but it’s definitely on the table. We could go for something similar to Poison:
config :jason, native_decoder: true, native_encoder: true
# or a combined
config :jason, native: true
Eiji
Nice! Idea in #9 issue (jason_native) is also really interesting and well planned. Project starred and watching. Waiting for final release. 
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