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[BUG] docker compose ps --format json no longer returns an array in 2.21.0 #10958

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Description

Description

The release notes for 2.21.0 state "Changed docker compose ps and docker compose ps --format=json output to align with Docker CLI."

However, in prior versions, the result was a valid JSON array. 2.21.0 returns individual objects, one after the other, with no [ … ] wrapper. This doesn't seem to be valid JSON.

Although jq can handle this, Ruby's JSON.parse rejects it as invalid; I've not tried other parsers.

Was this intended?

Steps To Reproduce

  1. With any Compose project, run docker compose up -d.
  2. Run docker-compose ps --format json.

Versions before 2.21.0 will return an array of objects; version 2.21.0 will return sequential objects, separated only by a new line.

Compose Version

% docker compose version
Docker Compose version v2.21.0
% docker-compose version
Docker Compose version v2.21.0

Docker Environment

Client:
 Version:    24.0.5
 Context:    orbstack
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.11.1
    Path:     /Users/username/.docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.21.0
    Path:     /Users/username/.docker/cli-plugins/docker-compose
  dev: Docker Dev Environments (Docker Inc.)
    Version:  v0.1.0
    Path:     /Users/username/.docker/cli-plugins/docker-dev
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.20
    Path:     /Users/username/.docker/cli-plugins/docker-extension
  init: Creates Docker-related starter files for your project (Docker Inc.)
    Version:  v0.1.0-beta.6
    Path:     /Users/username/.docker/cli-plugins/docker-init
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /Users/username/.docker/cli-plugins/docker-sbom
  scan: Docker Scan (Docker Inc.)
    Version:  v0.26.0
    Path:     /Users/username/.docker/cli-plugins/docker-scan
  scout: Command line tool for Docker Scout (Docker Inc.)
    Version:  0.20.0
    Path:     /Users/username/.docker/cli-plugins/docker-scout

Server:
 Containers: 22
  Running: 11
  Paused: 0
  Stopped: 11
 Images: 23
 Server Version: 24.0.5
 Storage Driver: overlay2
  Backing Filesystem: btrfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: fe457eb99ac0e27b3ce638175ef8e68a7d2bc373
 runc version: 82f18fe0e44a59034f3e1f45e475fa5636e539aa
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.4.13-orbstack-00090-ga4cfdc88d4df
 Operating System: OrbStack
 OSType: linux
 Architecture: aarch64
 CPUs: 10
 Total Memory: 11.67GiB
 Name: orbstack
 ID: 437f17f3-56ac-4f55-ad12-6154b025c473
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: true
 Insecure Registries:
  127.0.0.0/8
 Registry Mirrors:
  http://192.168.69.99:13588/
 Live Restore Enabled: false
 Product License: Community Engine
 Default Address Pools:
   Base: 192.168.215.0/24, Size: 24
   Base: 192.168.228.0/24, Size: 24
   Base: 192.168.247.0/24, Size: 24
   Base: 192.168.207.0/24, Size: 24
   Base: 192.168.167.0/24, Size: 24
   Base: 192.168.107.0/24, Size: 24
   Base: 192.168.237.0/24, Size: 24
   Base: 192.168.148.0/24, Size: 24
   Base: 192.168.214.0/24, Size: 24
   Base: 192.168.165.0/24, Size: 24
   Base: 192.168.227.0/24, Size: 24
   Base: 192.168.181.0/24, Size: 24
   Base: 192.168.158.0/24, Size: 24
   Base: 192.168.117.0/24, Size: 24
   Base: 192.168.155.0/24, Size: 24
   Base: 192.168.147.0/24, Size: 24
   Base: 192.168.229.0/24, Size: 24
   Base: 192.168.183.0/24, Size: 24
   Base: 192.168.156.0/24, Size: 24
   Base: 192.168.97.0/24, Size: 24
   Base: 192.168.171.0/24, Size: 24
   Base: 192.168.186.0/24, Size: 24
   Base: 192.168.216.0/24, Size: 24
   Base: 192.168.242.0/24, Size: 24
   Base: 192.168.166.0/24, Size: 24
   Base: 192.168.239.0/24, Size: 24
   Base: 192.168.223.0/24, Size: 24
   Base: 192.168.164.0/24, Size: 24
   Base: 192.168.163.0/24, Size: 24
   Base: 192.168.172.0/24, Size: 24
   Base: 172.17.0.0/16, Size: 16
   Base: 172.18.0.0/16, Size: 16
   Base: 172.19.0.0/16, Size: 16
   Base: 172.20.0.0/14, Size: 16
   Base: 172.24.0.0/14, Size: 16
   Base: 172.28.0.0/14, Size: 16

Anything else?

json_files.zip

This is occurring with OrbStack; Docker Desktop is still providing Docker Compose version v2.20.2-desktop.1, and is thus unaffected for now.

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