Trim an audio file using javascript (first 3 seconds)

I have a question that can I trim my audio file that is recorded via javascript? Like I want to trim the first 3 seconds. I recorded the audio file using p5.js and merged the recorded file with karaoke audio with AudioContext() and I want to trim it because of an unpleasant sound at the start.

You will probably need to read the audio into an AudioBuffer using something like AudioContext.decodeAudioData(), plug the AudioBuffer into a AudioBufferSourceNode. Then you can skip the first 3 seconds using the offset parameter of AudioBufferSourceNode.start() and record the resulting output stream.

Example code:

var source = audioCtx.createBufferSource();
var dest = audioCtx.createMediaStreamDestination();
var mediaRecorder = new MediaRecorder(dest.stream);

var request = new XMLHttpRequest();
request.open('GET', 'your.ogg', true);
request.responseType = 'arraybuffer';

request.onload = function() {
  var audioData = request.response;
  audioCtx.decodeAudioData(
    audioData,
    function(buffer) {
      source.buffer = buffer;
      source.connect(dest);
      mediaRecorder.start();
      source.start(audioCtx.currentTime, 3);
      // etc...
    },
    function(e){ 
      console.log("Error with decoding audio data" + e.err);
    }
  );

}

request.send();