How to Read JSON Files into Server Memory in Node.js?

Reading JSON Files into Server Memory in Node.js

To enhance server-side code performance, you may need to read a JSON object from a file into memory for swift access. Here's how you can achieve this in Node.js:

Synchronous Method:

For synchronous file reading, utilize the readFileSync() method from the fs (file system) module. This method reads the file content as a string and returns it as a parameter within the callback function. You can then use JSON.parse() to convert the string into a JSON object, as seen below:

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

Asynchronous Method:

For asynchronous file reading, leverage the readFile() method. This method accepts a callback function that is triggered upon completion of the file reading operation. Within the callback function, you can parse the file content and convert it into a JSON object:

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

Which method to use depends on your specific requirements. The synchronous method offers convenience but can impact performance in resource-intensive operations, while the asynchronous method aids in maximizing server performance.

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