webpack-json-loader/src/json-loader.js

a webpack loader test project

module.exports = function (source) {
    var value = typeof source === "string" ? JSON.parse(source) : source;

    value = JSON.stringify(value)
      .replace(/\u2028/g, '\\u2028')
      .replace(/\u2029/g, '\\u2029');
  
      return `module.exports = ${value}`;
}