`createReadStream` and `readFileSync` in NodeJS

readFileSync:

Synchronous: As the name suggests, readFileSync is a synchronous method, which means it blocks the execution of the program until the file reading is complete.
Blocking: The entire file is read in a single operation, and the program won't proceed until the file is completely read.
Suitable for small files: It's generally suitable for small files or scenarios where reading the entire file at once doesn't cause a significant delay.
Example:

const fs = require('fs');
const data = fs.readFileSync('file.txt', 'utf8');
console.log(data);

createReadStream:

Asynchronous: createReadStream is an asynchronous method that creates a readable stream for efficiently reading large files in chunks. It doesn't block the entire program and allows other tasks to continue while the file is being read.
Non-blocking: It reads the file in chunks, making it suitable for large files without causing a delay in the overall application.
Memory-efficient: It's memory-efficient because it doesn't load the entire file into memory at once.
Example:

const fs = require('fs');

const stream = fs.createReadStream('file.txt', 'utf8');

stream.on('data', (chunk) => {
  console.log(chunk);
});

stream.on('end', () => {
  console.log('File reading complete');
});

In summary, if you are working with small files or the synchronous nature of file reading doesn't impact your application's performance, you can use readFileSync. However, for large files or when you want to keep your application responsive, createReadStream is a better choice as it allows for asynchronous, non-blocking file reading in chunks.