Load resource file (json) in kotlin js

Question

Given this code, where should I place the file.json to be able to be found in the runtime?

// path: src/main/kotlin/Server.kt
fun main() {
  val serviceAccount = require("file.json")
}

I tried place it under src/main/resources/ without luck. I also use Gradle to compile kotlin to js with kotlin2js plugin.

Will this code run on the server side (NodeJS) or on the client side? — Alexander Egger
– Alexander Egger, Commented Mar 26, 2019 at 19:34
@AlexanderEgger server side, so the path is (easier) guaranteed — Diolor
– Diolor, Commented Mar 26, 2019 at 21:31
using gradle only wont help, use the kotlin-frontend-plugin as well, locate you file.json in the resources folder and watch the magic happen — andylamax
– andylamax, Commented Apr 21, 2019 at 13:55
you need something like json-loader plugin for webpack to load json with code — Vlad
– Vlad, Commented Jul 8, 2020 at 9:08

Alexander Egger · Accepted Answer · 2019-03-27 07:12:20Z

Assuming the Kotlin compiler puts the created JS file (say server.js) into the default location at build/classes/kotlin/main and the resource file (file.json) into build/resources/main.

And you are running server.js by executing node build/classes/kotlin/main/server.js

According to the NodeJS documentation:

Local modules and JSON files can be imported using a relative path (e.g. ./, ./foo, ./bar/baz, ../foo) that will be resolved against the directory named by __dirname (if defined) or the current working directory. (https://nodejs.org/api/modules.html#modules_require_id)

In our case __dirname is build/classes/kotlin/main

So the correct require statement is:

val serviceAccount = js("require('../../../resources/main/file.json')")

or if require is defined as a Kotlin function like in the question

val serviceAccount = require("../../../resources/main/file.json")

Eugene Petrenko · Accepted Answer · 2019-03-12 21:24:39Z

0

You may just use js("require('./file.json')") if you do not have import for the require function in Kotlin. The result will be dynamic, so you may cast it to Map.

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.js/js.html

edited Mar 12, 2019 at 21:24

answered Mar 11, 2019 at 23:01

Eugene Petrenko

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2 Comments

Diolor Over a year ago

How will solve the issue? I see that either require("file.json") or js("require('file.json')") will generate the same javascript code: require('file.json'). The problem still remains that the file.json cannot be found in the path. To be precice with the exception: Error: Cannot find module 'file.json'

Eugene Petrenko Over a year ago

I guess the ./file.json may help then

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