How to load JSON file using Play with Scala

Question

I need to load a JSON file with a list of cities in one of my controllers, in order to pass it to a view afterwards.

I have placed the file here: app/assets/jsons/countriesToCities.json
(By the way: is this an appropriate location, or should I place it somewhere else?)

I have read the docs and I can see it is possible to create a JsValue from a string: https://www.playframework.com/documentation/2.4.x/ScalaJson#Using-string-parsing

I want to create a JsValue in a similar fashion. The difference is that I want to load the content from a file, not from a string... I haven't found any code snippet on how to do this, unfortunately.
Do I have to use something else to read the file into a string and only then use the parse method on that string?

Code snippets with examples on how to do this in the answers will be highly appreciated! :)

Thank you very much in advance!

Answer 1

Looks like the comment about the possible duplicate is how to read a file from your app/assets folder. My answer is about how to parse Json from a stream. Combine the two and you should be good to go.

Json.parse accepts a few different argument types, one of which is InputStream.

val stream = new FileInputStream(file) val json = try {  Json.parse(stream) } finally { stream.close() } 

P.S. When you can't find what you're looking for in the written docs, the API Docs are a good place to start.