Learn Play JSON with this hands-on exercise.
Play JSON was originally part of Playframework, but is an independent lib for a long time now. So you don't need any Playframework concept or dependency to use Play JSON. Despite that, the Play JSON doc is found in Playframework one. And on StakOverflow too.
You may need Play Json API doc
Other needed doc will be refered to in the appropriate chapter.
Play JSON allow parsed JSON values handling with a set of classes representing possible JSON value types.
You have JsString, JsArray, JsNull, JsObject, etc.
Though you can explore and transform easily JSON values, an interesting part of this lib is mapping JSON values from/to model instances.
Mapping a JSON value to a model is achieved with methods of JsValue like as[T], asOpt[T] and validate[T]. They all needs an implicit Reads[T] to map a JSON value to a model.
Rendering JSON from a model is achieved with Json.toJson[T](value: T) that will render a JSON value from a model instance provided an implicit Writes[T].
After a short intro on JsValue and JsPath, we will study how to create Reads and Writes.
Before starting, be aware that some steps have sub-steps (like 3.7.4 for example). Some sub-steps have their own branch because there is different difficulty level. For example, if you finished all sub-steps of "Step1" branch, you can checkout "Step2" to get Step1 solutions. Once you finished Step 2.6, you see that you chan checkout "Step2.7.1_easy" or ""Step2.7.1_hard" depending on how much you want to be hurt.
WARNING: checkout of any branch will give solution for former steps !
General advice: when starting a Step N (by doing a checkout on "StepN" branch), always do git branch -a to remember if the current step have difficulty levels
To start, checkout Step1 branch and follow Step1 guide