How To Read Data Of A Nodejs Stream Without It Being Lost?

I need to know the encoding of a node stream for which I am using detect-character-encoding module. But the problem is that I can only read encodings of a buffer and not a stream d

Solution 1:

You can build a promise to return both the contents and the charset of the stream:

constcharsetStream = (stream) => newPromise((resolve, reject) => {

  const detectCharacterEncoding = require('detect-character-encoding');
  let chunks = [];

  stream.on('data', (chunk) => {
    chunks.push(chunk);
  })

  stream.on('end', () => {
    chunks = Buffer.concat(chunks);
    resolve({
      content: chunks,
      charset: detectCharacterEncoding(chunks)
    })
  })

  stream.on('error', (err) => {
    reject(err);
  })

});

charsetStream(FileStream)
  .then(info => {
    console.log('content', info.content);
    console.log('charset', info.charset);
  })
  .catch(console.log);
  
  // You can use the FileStream outside the method but you can use it once !// this is completely different than the "stream" variableFileStream.on('data', (chunk) => {
    console.log('FileStream', chunk.toString());
  })