This script generates js code for importing all json files from specific folder.

importJsonsFromFolder.js

const fs = require('fs');

const getImportsFromFiles = (files, templateFunction) => files
  .filter(file => file.match(/\.json/))
  .map(file => file.split('.json')[0])
  .map(templateFunction)
  .join('\n');

const replaceForbiddenSymbols = file => file
  .replace(/\./g, '')
  .replace(/\-/g, '_');

const fileToImport = file => `import * as ${replaceForbiddenSymbols(file)} from './${file}.json';`;

const fileToObjectProperty = file => `  '${file}': ${replaceForbiddenSymbols(file)},`;

const generateFileImportingJsons = files => `${getImportsFromFiles(files, fileToImport)}

export default {
${getImportsFromFiles(files, fileToObjectProperty)}
};
`;

fs.readdir(__dirname + '/path/to/folder/with/jsons', (err, files) => {
  console.log(generateFileImportingJsons(files));
});