How to Load JSON Data into Server Memory with JavaScript and Node.js?

Incorporating JSON Data into Server Memory Using JavaScript and Node

To optimize server responsiveness, accessing frequently used data from memory rather than retrieving it from external sources is crucial. This article explores how to read a JSON object into memory using JavaScript and Node, avoiding external services like Mongo or Alfred.

How to Read a JSON Object

To read a JSON object from a text or JavaScript (JS) file into server memory, consider the following steps:

Node's File System Module:

To access file system operations, import the file system (fs) module:

<code class="javascript">var fs = require('fs');</code>

Synchronous Reading (Recommended for Small Files):

Use the readFileSync method to read the file's contents and then parse the data using JSON.parse:

<code class="javascript">var obj = JSON.parse(fs.readFileSync('file', 'utf8'));</code>

Asynchronous Reading (Preferred for Large Files):

The readFile method handles asynchronous file reading. Provide a callback function to handle the returned data:

<code class="javascript">var obj;
fs.readFile('file', 'utf8', function (err, data) {
  if (err) throw err;
  obj = JSON.parse(data);
});</code>

Choosing Between File Types:

Whether to store the JSON data in a text file or a JS file is largely a matter of preference. JSON text files are platform-independent, while JS files allow for additional optimizations such as minification and compression. Consider your specific use case and requirements when deciding between the two.

By following these steps, you can efficiently load JSON data into server memory, enhancing server responsiveness and overall application performance.

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