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qmk/docs/reference_info_json.md

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info.json

This file is used by the QMK API. It contains the information QMK Configurator needs to display a representation of your keyboard. You can also set metadata here.

You can create info.json files at every level under qmk_firmware/keyboards/<name> to specify this metadata. These files are combined, with more specific files overriding keys in less specific files. This means you do not need to duplicate your metadata information. For example, qmk_firmware/keyboards/clueboard/info.json specifies manufacturer and maintainer, while qmk_firmware/keyboards/clueboard/66/info.json specifies more specific information about Clueboard 66%.

info.json Format

The info.json file is a JSON formatted dictionary with the following keys available to be set. You do not have to set all of them, merely the keys that apply to your keyboard.

  • keyboard_name
    • A free-form text string describing the keyboard.
    • Example: Clueboard 66%
  • url
    • A URL to the keyboard's product page, QMK.fm/keyboards page, or other page describing information about the keyboard.
  • maintainer
    • GitHub username of the maintainer, or qmk for community maintained boards
  • debounce
    • How many milliseconds (ms) to wait for debounce to happen. (Default: 5)
  • diode_direction
  • layout_aliases
    • A dictionary containing layout aliases. The key is the alias and the value is a layout in layouts it maps to.
  • layouts
    • Physical Layout representations. See the Layout Format section for more detail.
  • matrix_pins
    • Configure the pins corresponding to columns and rows, or direct pins. See Matrix Pins for more detail.
  • rgblight
  • usb
    • Configure USB VID, PID, and other parameters. See USB for more detail.

Layout Format

Within our info.json file the layouts portion of the dictionary contains several nested dictionaries. The outer layer consists of QMK layout macros, for example LAYOUT_ansi or LAYOUT_iso. Within each layout macro are keys for width, height, and key_count, each of which should be self-explanatory.

  • width
    • Optional: The width of the layout in Key Units
  • height
    • Optional: The height of the layout in Key Units
  • key_count
    • Optional: The number of keys in this layout
  • layout
    • A list of Key Dictionaries describing the physical layout. See the next section for more details.

Key Dictionary Format

Each Key Dictionary in a layout describes the physical properties of a key. If you are familiar with the Raw Code for https://keyboard-layout-editor.com you will find many of the concepts the same. We re-use the same key names and layout choices wherever possible, but unlike keyboard-layout-editor each key is stateless, inheriting no properties from the keys that came before it.

All key positions and rotations are specified in relation to the top-left corner of the keyboard, and the top-left corner of each key.

  • x
    • Required: The absolute position of the key in the horizontal axis, in Key Units.
  • y
    • Required: The absolute position of the key in the vertical axis, in Key Units.
  • w
    • The width of the key, in Key Units. Ignored if ks is provided. Default: 1
  • h
    • The height of the key, in Key Units. Ignored if ks is provided. Default: 1
  • label
    • What to name this position in the matrix.
    • This should usually correspond to the keycode for the first layer of the default keymap.
  • matrix
    • A 2 item list describing the row and column location for this key.

Matrix Pins

Currently QMK supports connecting switches either directly to GPIO pins or via a switch matrix. At this time you can not combine these, they are mutually exclusive.

Switch Matrix

Most keyboards use a switch matrix to connect keyswitches to the MCU. You can define your pin columns and rows to configure your switch matrix. When defining switch matrices you should also define your diode_direction.

Example:

{
  "diode_direction": "COL2ROW",
  "matrix_pins": {
    "cols": ["F4", "E6", "B1", "D2"],
    "rows": ["B0", "D3", "D5", "D4", "D6"]
  }
}

Direct Pins

Direct pins are when you connect one side of the switch to GND and the other side to a GPIO pin on your MCU. No diode is required, but there is a 1:1 mapping between switches and pins.

When specifying direct pins you need to arrange them in nested arrays. The outer array consists of rows, while the inner array is a text string corresponding to a pin. You can use null to indicate an empty spot in the matrix.

Example:

{
    "matrix_pins": {
        "direct": [
            ["A10", "A9"],
            ["A0", "B8"],
            [null, "B11"],
            ["B9", "A8"],
            ["A7", "B1"],
            [null, "B2"]
        ]
    }
}

RGB Lighting

This section controls the legacy WS2812 support in QMK. This should not be confused with the RGB Matrix feature, which can be used to control both WS2812 and ISSI RGB LEDs.

The following items can be set. Not every value is required.

  • led_count
    • The number of LEDs in your strip
  • pin
    • The GPIO pin that your LED strip is connected to
  • animations
  • sleep
    • Set to true to enable lighting during host sleep
  • split
    • Set to true to enable synchronization functionality between split halves
  • split_count
    • For split keyboards, the number of LEDs on each side
  • max_brightness
    • (0-255) What the maxmimum brightness (value) level is
  • hue_steps
    • How many steps of adjustment to have for hue
  • saturation_steps
    • How many steps of adjustment to have for saturation
  • brightness_steps
    • How many steps of adjustment to have for brightness (value)

Example:

{
    "rgblight": {
        "led_count": 4,
        "pin": "F6",
        "hue_steps": 10,
        "saturation_steps": 17,
        "brightness_steps": 17,
        "animations": {
            "all": true
        }
    }
}

RGB Light Animations

The following animations can be enabled:

Key Description
all Enable all additional animation modes.
alternating Enable alternating animation mode.
breathing Enable breathing animation mode.
christmas Enable christmas animation mode.
knight Enable knight animation mode.
rainbow_mood Enable rainbow mood animation mode.
rainbow_swirl Enable rainbow swirl animation mode.
rgb_test Enable RGB test animation mode.
snake Enable snake animation mode.
static_gradient Enable static gradient mode.
twinkle Enable twinkle animation mode.

USB

Every USB keyboard needs to have its USB parmaters defined. At a minimum you need to set vid, pid, and device version.

Example:

{
  "usb": {
    "vid": "0xC1ED",
    "pid": "0x23B0",
    "device_ver": "0x0001"
  }
}