AudioBinary

`audio/x-m4a`

M4A

Reference for audio/x-m4a, the common MIME type variant for Apple's M4A audio files containing AAC or ALAC audio.

MIME Type Detector

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Expected extensions: .m4a

HTTP Content-Type Header

HTTP Header

Content-Type: audio/x-m4a

Associated File Extensions

.m4a

Quick Facts

MIME Type	audio/x-m4a
Category	Audio
Type	Binary
Extensions	.m4a

Common Usage

M4A is Apple's audio file extension for MPEG-4 audio, typically containing AAC (lossy) or ALAC (lossless) encoded audio. It is the default format for iTunes, Apple Music, and iPhone voice memos.

M4A offers better quality than MP3 at equivalent file sizes.

Code Examples

HTML

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

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

Node.js

// Express.js
app.get('/file', (req, res) => {
  res.type('audio/x-m4a');
  res.send(data);
});

// Node.js http
res.writeHead(200, { 'Content-Type': 'audio/x-m4a' });

nginx

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

# Or set for a specific location
location /api/ {
    default_type audio/x-m4a;
}