Accept gzipped json POST request in Nuxt3/H3

myapimethod.post.ts

import { H3Event, readBody, eventHandler } from 'h3';
import { createGunzip } from 'zlib';
import { pipeline } from 'stream';
import { promisify } from 'util';
const pipelineAsync = promisify(pipeline);

export default eventHandler(async (event: H3Event) => {
  let rawBody = '{}';
  if (event.headers.get('content-encoding') === 'gzip') {
    const { req } = event; // deprecated but it works... open to suggestion, readBody fails
    const gunzip = createGunzip();
    const decompressedData: Buffer = await new Promise((resolve, reject) => {
      const chunks: Buffer[] = [];
      pipelineAsync(req, gunzip)
        .then(() => {
          gunzip.on('data', chunk => chunks.push(chunk));
          gunzip.on('end', () => resolve(Buffer.concat(chunks)));
          gunzip.on('error', reject);
        })
        .catch(reject);
    });
    rawBody = JSON.parse(decompressedData.toString());
  } else {
    rawBody = await readBody(event);
  }
  // .... Do something with rawBody

  return 'ok';
});

In case you want to send a gzipped post request from some client.