CODE EXAMPLE FOR JAVASCRIPT

svelte json

// add at the beginning of the file :
import json from '@rollup/plugin-json'

// under the plugin line :
plugins: [
  json({
    compact: true
  }),

//...
// Svelte file:
<script>
import * as myjson from './test.json'
</script>

<p>{myjson.mykey}</p>