How to fix DeprecationWarning: util.pump is deprecated (use stream.pipe instead) in Node.js

node --trace-deprecation your-app.js

// ❌ Deprecated
const util = require('util');
util.pump(readableStream, writableStream);

// ✅ Correct - using pipe()
readableStream.pipe(writableStream);

// Example: piping file streams
const fs = require('fs');
fs.createReadStream('input.txt')
  .pipe(fs.createWriteStream('output.txt'));

const { pipeline } = require('stream');
const fs = require('fs');

// ✅ Best practice - pipeline with error handling
pipeline(
  fs.createReadStream('input.txt'),
  transformStream,
  fs.createWriteStream('output.txt'),
  (err) => {
    if (err) {
      console.error('Pipeline failed:', err);
    } else {
      console.log('Pipeline succeeded');
    }
  }
);

const { pipeline } = require('stream/promises');

try {
  await pipeline(
    fs.createReadStream('input.txt'),
    transformStream,
    fs.createWriteStream('output.txt')
  );
  console.log('Pipeline succeeded');
} catch (err) {
  console.error('Pipeline failed:', err);
}

// ❌ Basic pipe - no error handling or cleanup
readableStream.pipe(writableStream);

// ⚠️ Manual error handling with pipe
const readable = fs.createReadStream('input.txt');
const writable = fs.createWriteStream('output.txt');

readable.on('error', (err) => {
  console.error('Read error:', err);
  writable.destroy();
});

writable.on('error', (err) => {
  console.error('Write error:', err);
  readable.destroy();
});

readable.pipe(writable);

// ✅ Pipeline handles this automatically
pipeline(
  fs.createReadStream('input.txt'),
  fs.createWriteStream('output.txt'),
  (err) => {
    if (err) console.error('Pipeline failed:', err);
  }
);

# Identify the package from the stack trace
# Update the specific package
npm update package-name

# Check for all outdated packages
npm outdated

# Update all packages
npm update

npm install pump

const pump = require('pump');

pump(stream1, stream2, stream3, (err) => {
  if (err) console.error('Pump failed:', err);
});