# Get mutual groups with another user

Retrieves groups that both the current user and the specified user are members of. Only returns groups where both users have active memberships (MEMBER status). Useful for finding common communities and shared interests between users.

Endpoint: GET /api/v1/groups/users/{userId}/mutual
Version: 1.0
Security: header

## Path parameters:

  - `userId` (string, required)
    The unique identifier of the user to find mutual groups with
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

## Response 200 fields (application/json):

  - `meta` (object, required)
    group metadata including color

  - `meta.color` (string, required)
    Group color in HEX format

  - `privacy` (string, required)
    who can access the group's content
    Enum: "PUBLIC", "PRIVATE"

  - `visibility` (string, required)
    how discoverable the group is
    Enum: "VISIBLE", "UNLISTED", "HIDDEN"

  - `joinMode` (string, required)
    how users can join the group
    Enum: "OPEN", "APPROVAL", "INVITE_ONLY"

  - `location` (object,null)
    group's location

  - `location.geo` (object,null)
    Coordinates and other geo data

  - `location.geo.latitude` (number)

  - `location.geo.longitude` (number)

  - `location.geo.altitude` (number,null)

  - `location.geo.accuracy` (number,null)

  - `location.geo.verticalAccuracy` (number,null)

  - `location.geo.speed` (number,null)

  - `location.geo.bearing` (number,null)

  - `location.geo.timestamp` (integer,null)

  - `location.name` (string,null)

  - `location.autoUpdate` (boolean)

  - `location.show` (boolean)

  - `timezone` (object,null)
    group's timezone

  - `timezone.ianaTimezone` (string,null)

  - `groupId` (string, required)
    internal id of this group
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `groupName` (string, required)
    unique group name

  - `domain` (string, required)
    group's domain, remote only, empty for local

  - `displayName` (string, required)
    full name of the group

  - `summary` (string, required)
    Group description

  - `uri` (string, required)
    URI of this group

  - `publicKey` (string, required)
    Group's public key for ActivityPub

  - `privateKey` (string,null)
    Group's private key for ActivityPub

  - `forumId` (string,null)
    ID of the forum associated with this group
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `stats` (object, required)
    Group statistics

  - `fields` (object, required)
    Custom fields for the group

  - `type` (string, required)
    the type of this group
    Enum: "CHANNEL", "INTEREST_GROUP", "ORGANIZATION"

  - `membersUrl` (string, required)
    URL to group members

  - `banner` (object,null)
    Group's header/banner upload

  - `banner.uploadId` (string, required)
    Internal id
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `banner.userId` (string, required)
    User id this upload belongs to
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `banner.uploadType` (string, required)
    Type of the upload
    Enum: "VIDEO", "IMAGE", "AUDIO", "DOCUMENT", "OTHER"

  - `banner.meta` (object, required)
    Meta data

  - `banner.meta.blurhash` (string,null)

  - `banner.meta.altText` (string,null)

  - `banner.size` (integer, required)
    Size in bytes of all the files in this upload

  - `banner.files` (array, required)
    List of all the files this upload has

  - `banner.files.uri` (string,null, required)
    Full url of the file

  - `banner.files.fileId` (string, required)
    File id
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `banner.files.extension` (string, required)
    File extension
    Example: "mp4"

  - `banner.files.original` (boolean, required)
    true if this file is original, false if it is a derivative

  - `banner.files.meta` (object, required)
    File metadata. Contains optional values for width, height etc.

  - `banner.files.meta.duration` (number,null)
    Video duration in seconds

  - `banner.files.meta.width` (integer,null)
    Media width

  - `banner.files.meta.height` (integer,null)
    Media height

  - `banner.files.meta.codec` (string,null)
    Video codec

  - `banner.files.meta.rotate` (integer,null)
    Rotation in degrees

  - `banner.files.size` (integer, required)
    File size in bytes

  - `banner.files.createdAt` (string, required)
    Example: "2022-03-10T16:15:50Z"

  - `banner.files.updatedAt` (string, required)
    Example: "2022-03-10T16:15:50Z"

  - `banner.files.type` (string, required)
    File type
    Enum: "VIDEO", "IMAGE", "AUDIO", "DOCUMENT", "OTHER"

  - `banner.tags` (array, required)
    List of tags attached to upload
    Enum: "Post", "Avatar", "Header", "Album", "Emoji", "Event"

  - `banner.error` (string,null)
    Upload processing error

  - `banner.cached` (boolean)
    true if cached

  - `banner.logs` (string,null)
    Logs

  - `banner.remote` (boolean)
    true if this upload is remote

  - `avatar` (object,null)
    Group's avatar

  - `deletedAt` (string,null)
    Group deletion timestamp
    Example: "2022-03-10T16:15:50Z"

  - `createdAt` (string, required)
    Group's creation timestamp
    Example: "2022-03-10T16:15:50Z"

  - `updatedAt` (string, required)
    Group's last update timestamp
    Example: "2022-03-10T16:15:50Z"

  - `membersCount` (integer)
    Cached count of active members in the group

## Response 401 fields (application/json):

  - `errorCode` (string, required)
    Error code

  - `message` (string, required)
    Error message

  - `docUrl` (string)
    Link to documentation

## Response 403 fields (application/json):

  - `errorCode` (string, required)
    Error code

  - `message` (string, required)
    Error message

  - `docUrl` (string)
    Link to documentation

## Response 404 fields (application/json):

  - `errorCode` (string, required)
    Error code

  - `message` (string, required)
    Error message

  - `docUrl` (string)
    Link to documentation