json4s: one json ast to rule them all.

[Ivan Porto Carrero]

Hi, 

At this moment there are at least 6 json libraries for scala, not counting the java json libraries. All these libraries have a very similar AST. This project aims to provide a single AST to be used by other scala json libraries.

https://github.com/json4s/json4s

I've extracted lift-json from lift and renamed its package to be native. It's still licensed under the same license etc.

So the current AST is based on the the JValue from lift-json with the addition that it now also supports using bigdecimal in addition of a double to represent decimal values.

You can still use the Formats provided by lift-json but it also supports the approach Play2 has taken with type classes. On a JValue there are 3 new methods which take a Reader (Reads) as implicit to extract values.

I've also included a parser that uses jackson instead of the native scala parser provided by lift-json.

I hope this is a project you guys think is worth pursuing and want to contribute to. It helps a lot when you want to/have to support different json libraries.

[Eduardo Pareja Tobes]

nice!

are you aware of Rosetta Json?

--

Eduardo Pareja Tobes

[Alex Cruise]

On Wed, Aug 29, 2012 at 8:21 AM, Ivan Porto Carrero <iv...@flanders.co.nz> wrote:

At this moment there are at least 6 json libraries for scala, not counting the java json libraries. All these libraries have a very similar AST. This project aims to provide a single AST to be used by other scala json libraries.

https://github.com/json4s/json4s

Awesome! I hope, if it's any good, that everyone will agree on it and adopt it quickly. ;)

-0xe1a

[Matthew Pocock]

http://xkcd.com/927/

--

Dr Matthew Pocock

Integrative Bioinformatics Group, School of Computing Science, Newcastle University

mailto: turingate...@gmail.com

gchat: turingate...@gmail.com

msn: matthew...@yahoo.co.uk

irc.freenode.net: drdozer

skype: matthew.pocock

tel: (0191) 2566550

mob: +447535664143

[doug]

Any change of supporting 2.8.2? https://github.com/json4s/json4s/blob/master/project/build.scala#L55

 

-0xe1a

[Ivan Porto Carrero]

I removed the jackson-scala-module dependency and published the project for a bunch of scala versions.

https://github.com/json4s/json4s/blob/master/project/build.scala#L57

https://oss.sonatype.org/content/repositories/snapshots/org/json4s/

before I accidentally published with crosspaths disabled, that has also been addressed obviously.

[Ivan Porto Carrero]

There is now also a scala 2.10 build available for json4s

I don't think it will be possible to support both scala 2.8 and 2.10 from the same codebase, mostly because of the different scalaz versions required

[Kaspar Fischer]

Hi Ivan, 

I was wondering whether the 2.10-RC1 release (or snapshot) of json4s is available publicly somewhere?

Thanks,

Kaspar

[Kaspar Fischer]

Answering myself: it is available here: https://oss.sonatype.org/content/repositories/snapshots/org/json4s/

[Jacobus]

Hi,

I use spray-json (https://github.com/spray/spray-json) but json4s looks like a great project also. I realise I'm not comparing apples with apples, as they are serving different purposes.

json4s may also be well suited to serve as a Slick (http://slick.typesafe.com/) driver - Allowing you to 'query' JSON over webservices in a similar fashion to the way you would query a database.

Best regards,
Jacobus