body-parser.md

Body-parser

body-parser can be replaced with more modern alternatives which are both lighter and faster.

Alternatives

Native Implementation

For simple use cases, you can implement a minimal body parser in vanilla JavaScript:

const sizeLimit = 10 * 1024; // limit body size to 10kB
req.body = {};

await new Promise(function(res, rej) {
  let buffers = [];
  let size = 0;

  // parse each chunk and append them into Buffer array
  req.on('data', chunk => {
    size += chunk.length;
    if (size > sizeLimit) {
      return rej(new Error('Size limit'));
    }

    buffers.push(chunk);
  });

  req.on('end', () => res(buffers));
})
.then(function(buffers) {
  if (!buffers.length) return;

  try {
    req.body = JSON.parse(Buffer.concat(buffers).toString());
  } catch (err) {
    return Promise.reject(new Error('Invalid JSON: ' + err.message));
  }
});

Do note that the above implementation lacks sophisticated features such as better error handling, timeouts, flexible size limits, etc.

milliparsec

milliparsec a modern body-parser alternative that supports async / await, lighter (8 kB vs 62.6 kB for body-parser), and 30% faster

Project Page npm