added necessary npm packages

node_modules/json-server/lib/cli/utils/is.js

@@ -0,0 +1,20 @@
+"use strict";
+
+module.exports = {
+  JSON,
+  JS,
+  URL
+};
+
+function JSON(s) {
+  return !URL(s) && /\.json$/.test(s);
+}
+
+function JS(s) {
+  return !URL(s) && /\.js$/.test(s);
+}
+
+function URL(s) {
+  return (/^(http|https):/.test(s)
+  );
+}

node_modules/json-server/lib/cli/utils/load.js

@@ -0,0 +1,41 @@
+'use strict';
+
+const path = require('path');
+const request = require('request');
+const low = require('lowdb');
+const fileAsync = require('lowdb/lib/storages/file-async');
+const is = require('./is');
+
+module.exports = function (source, cb) {
+  if (is.URL(source)) {
+    // Load remote data
+    const opts = {
+      url: source,
+      json: true
+    };
+
+    request(opts, (err, response) => {
+      if (err) return cb(err);
+      cb(null, response.body);
+    });
+  } else if (is.JS(source)) {
+    // Clear cache
+    const filename = path.resolve(source);
+    delete require.cache[filename];
+    const dataFn = require(filename);
+
+    if (typeof dataFn !== 'function') {
+      throw new Error('The database is a JavaScript file but the export is not a function.');
+    }
+
+    // Run dataFn to generate data
+    const data = dataFn();
+    cb(null, data);
+  } else if (is.JSON(source)) {
+    // Load JSON using lowdb
+    const data = low(source, { storage: fileAsync }).getState();
+    cb(null, data);
+  } else {
+    throw new Error(`Unsupported source ${source}`);
+  }
+};