AudioBinary

`audio/mp4`

MP4 Audio

Reference for audio/mp4, the MIME type for audio-only MP4 files using AAC or other codecs in an MPEG-4 container.

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Expected extensions: .m4a, .mp4a

HTTP Content-Type Header

HTTP Header

Content-Type: audio/mp4

Associated File Extensions

.m4a.mp4a

Quick Facts

MIME Type	audio/mp4
Category	Audio
Type	Binary
Extensions	.m4a, .mp4a

Common Usage

Audio in an MP4 container typically uses AAC encoding. It is the format for iTunes Store purchases, Apple Music downloads, podcast files, and is widely supported by media players.

M4A files are the most common instance of this MIME type.

Code Examples

HTML

<!-- Link or embed with explicit type -->
<link rel="stylesheet" href="file.m4a" type="audio/mp4">

<!-- Or for script/media elements -->
<script type="audio/mp4" src="file.m4a"></script>

Node.js

// Express.js
app.get('/file', (req, res) => {
  res.type('audio/mp4');
  res.send(data);
});

// Node.js http
res.writeHead(200, { 'Content-Type': 'audio/mp4' });

nginx

# nginx.conf — add to types block or use default
types {
    audio/mp4  m4a mp4a;
}

# Or set for a specific location
location /api/ {
    default_type audio/mp4;
}