json4s/json4s

A single AST to be used by other scala json libraries

Stefan Ollinger

@dozed

It exists, officially in form of https://github.com/json4s/json4s/tree/3.4/scalaz, but it needs some polishing

eugene yokota

@eed3si9n

i see, but I am guessing that it pulls in Scalaz as dependency

anyfoo. thanks for the info!

Stefan Ollinger

@dozed

Yep, the scalaz dependency might be a problem (dependency size, conflicts)

Sam Smoot

@sam

Pretty sure I just spotted a bug while browsing the code trying to point out why using json4s-native 3.3.x was an issue for another project: https://github.com/json4s/json4s/pull/339/files#r60582054

The fix is pretty trivial. I included code in my comment for it. Just didn’t feel like setting everything up, writing a failing spec and producing a PR. ;) Doesn’t impact me since I wouldn’t use the alwaysEncodeUnicode option anyways. But if you do, I’m fairly confident the invalid-json-control-character bug is still present in that case.

Simon Hafner

@reactormonk

What's the name of the decoder typeclass I need to provide?

Spencer Wood

@malibuworkcrew

Hey json4s crew, love the library! Do you happen to have a planned release schedule for 3.4? We'd love to get the mutable parser feature.

Kazuhiro Sera

@seratch

@malibuworkcrew Indeed, it's about time to release 3.4. I'll work on it. Maybe this month.

Spencer Wood

@malibuworkcrew

Thanks Kaz! Looking forward to it

Sam Smoot

@sam

Hi, I’m wondering how to remove an item from a JArray by ordinal? ie:

Extraction.decompose(List(“one”, “two”, “three”)).remove(1) == JArray(List(JString(“one”), JString(“three”)))

Sam Smoot

@sam

Figured it out:

photoDocument transformField {
   case ("comments", JArray(comments)) =>
     val (start, _ :: end) = comments.splitAt(1)
    ("comments", start ::: end)
}

Milan van der Meer

@milanvdm

Is it possible to parse a Json string to an object based on the value of one field?
Let's say you have 2 possible kinds of Json strings and depending on one field value it is one of the two kinds?

(I can of course use an if test but just curious if there is a nicer way)

Kazuhiro Sera

@seratch

Going to publish 3.4.0 today. https://github.com/json4s/json4s/pull/370#issuecomment-226040413

Kazuhiro Sera

@seratch

Done. https://github.com/json4s/json4s/releases/tag/v3.4.0

Arnaud Gourlay

@agourlay

Great, thank you for the hard work :+1:
Where can I find the release notes for 3.4?

Oleg Yarin

@monapasan

Hey Guys,
i am trying to use json4s. Haven't found any information about it:
Is it possible to escape/unescape a string with help of json4s ?

Oleg Yarin

@monapasan

anyone ?

Stefan Ollinger

@dozed

@monapasan Can you give an example what you are trying to do?

@seratch Thanks for releasing 3.4

Tal

@talgendler

Hi, I created a pull request to support new MongoDB Java Async driver, since they introduced some new types it's not possible to use the current mongodb support. If you have any remarks, suggestions or anything I can do to make it better, please let me know

Oleg Yarin

@monapasan

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Xingze Zhang

@diggzhang

Hey,Guys.Is there any way to use json4s in akka-http but without case class ?

```

scala> import org.json4s._
scala> import org.json4s.jackson.JsonMethods._

scala> implicit val formats = DefaultFormats // Brings in default date formats etc.


// I don’t want use case class here
scala> case class Child(name: String, age: Int, birthdate: Option[java.util.Date])
scala> case class Address(street: String, city: String)
scala> case class Person(name: String, address: Address, children: List[Child])

scala> val json = parse("""
         { "name": "joe",
           "address": {
             "street": "Bulevard",
             "city": "Helsinki"
           },
           "children": [
             {
               "name": "Mary",
               "age": 5,
               "birthdate": "2004-09-04T18:06:22Z"
             },
             {
               "name": "Mazy",
               "age": 3
             }
           ]
         }
       """)

Marius B. Kotsbak

@mkotsbak

How to use Int with json4s serialazing?

Seems to either use BigInt or Long, both of which fails to deserialize to Int

kumariitr

@kumariitr

I want to create a pull request for json4s library

have added a new feature

can you please guide me?

Daniela Sfregola

@DanielaSfregola

Hi guys, I have a case class similar to the following: case class Test(seq: Seq[Long]). I have the problem that json4s matches every json as a valid for that case class, as {} is automatically filled as empty list

I am using the DefaultFormats, is there a way to tell json4s that it should not consider {} as a valid json for that case class?

thanks!

André Luiz Diniz

@andrelu

Is there a way given a case class T write it as a JValue?

Adianto Wibisono

@wibisono

Hi,
If any of you have insight on what to do with legacy domain POJO, if we wanted to (de) serialize with json4s.

I saw a guy was asking question in StackOverflow from 2015, with no answer up to now : http://stackoverflow.com/questions/29789424/json4s-deserialisation-of-java-pojos.

So far what seems to work would be to have a matching Scala case classes for these POJOs, but this makes the domain model harder to maintain. If you guys have suggestions, please let me know.

Thanks in advance.

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skchrko

@skchrko

Hello, I want to parse invalid JSON with json4s via jackson

(that json has single quotes around names)

jackson has an option for it,

ObjectMapper mapper = new ObjectMapper();
mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);

but how can I tell json4s to use that jackson configuration?

skchrko

@skchrko

oh, just JsonMethods.mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true), it seems.

Sam Smoot

@sam

Hi, I was just wondering if there's macros or anything for case-classes to produce a JsonFormat[MyCaseClass]? Like spray-json's jsonFormatN, or Argonaut's casecodecN helpers?

Sandeep Kota

@sandeepkota

Hi all,
From json string, based on the value of some Node, I would like to create a Scala Object. Do we have any formatters like in spring json?

Sandeep Kota

@sandeepkota

This should happen, while extracting the object from JSON String.

Eugene Platonov

@jozic

recently found myself in a need to convert optional field from json input to a sequence in a case class
like case class A(s: String, i: Seq[Int]) and json " { "s": "boo", "i": 5}" or "{"s": "boo" }
managed to write a simple FieldSerializer that converts a specified JValue to JArray

def asArray(name: String): PartialFunction[JField, JField] = {
  case JField(`name`, value) => JField(name, JArray(List(value)))
}

@seratch would you be interested in a pr to add this to FieldSerializer object along renameFrom and others?

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