How do I read the contents of a Node.js stream into a string variable?

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Another way would be to convert the stream to a promise (refer to the example below) and use then (or await) to assign the resolved value to a variable.

function streamToString (stream) {
  const chunks = [];
  return new Promise((resolve, reject) => {
    stream.on('data', (chunk) => chunks.push(Buffer.from(chunk)));
    stream.on('error', (err) => reject(err));
    stream.on('end', () => resolve(Buffer.concat(chunks).toString('utf8')));
  })
}

const result = await streamToString(stream)

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