lookup> .mmd

.MMD·File Extension

MMD Data & Text — A .mmd file is a MMD Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

Data & Textapplication/vnd.chipnuts.karaoke-mmd

Quick facts

Extension.mmd

File typeMMD Data & Text

MIME typeapplication/vnd.chipnuts.karaoke-mmd

CategoryData & Text

Charset—

Compressible—

What is .mmd

What is a .mmd file?

A .mmd file is a MMD Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

In the mime-db registry it maps to application/vnd.chipnuts.karaoke-mmd. When serving .mmd over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to application/vnd.chipnuts.karaoke-mmd and is used by Mermaid among others — and is delivered over HTTP via the Content-Type header.

How to open .mmd files

Use VS Code or Notepad++ to open and edit .mmd files.
Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: application/vnd.chipnuts.karaoke-mmd

Common software that reads/writes .mmd:

VS CodeNotepad++Sublime Textjq

Relation chain

.mmdextension of

format

MMD Data & Textserved as

mime type

application/vnd.chipnuts.karaoke-mmdsent via header

http header

Related extensions

Related MIME types

application/vnd.chipnuts.karaoke-mmd

.mmd

Related programming languages

Mermaid

.mmd .mermaid

Common uses

Configuration files
Data interchange between systems
API request and response payloads
Logs and data exports

How to edit .mmd files

Open the file with VS Code, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .mmd files

Create a new file and save it with the .mmd extension, or export this format from VS Code.

Frequently asked questions

What programs can open .mmd files?

Common options include VS Code, Notepad++, Sublime Text. You can also open many of these files with built-in viewers or a browser.

How do I create a .mmd file?

Create a new file in any text editor or the app that owns the format and save it with the .mmd extension.

What is the relationship between .mmd and the application/vnd.chipnuts.karaoke-mmd MIME type?

application/vnd.chipnuts.karaoke-mmd is the media type identifier used for .mmd files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-08-18

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