$ pub outdated --json
{
  "packages": [
    {
      "package": "bar",
      "current": {
        "version": "1.0.0",
        "overridden": true
      },
      "upgradable": {
        "version": "1.0.0",
        "overridden": true
      },
      "resolvable": {
        "version": "1.0.0",
        "overridden": true
      },
      "latest": {
        "version": "2.0.0"
      }
    },
    {
      "package": "foo",
      "current": {
        "version": "1.0.0",
        "overridden": true
      },
      "upgradable": {
        "version": "1.0.0",
        "overridden": true
      },
      "resolvable": {
        "version": "1.0.0",
        "overridden": true
      },
      "latest": {
        "version": "2.0.0"
      }
    }
  ]
}

$ pub outdated --no-color
Dependencies  Current              Upgradable           Resolvable           Latest  
bar           *1.0.0 (overridden)  *1.0.0 (overridden)  *1.0.0 (overridden)  2.0.0   
foo           *1.0.0 (overridden)  *1.0.0 (overridden)  *1.0.0 (overridden)  2.0.0   

dev_dependencies: all up-to-date

transitive dependencies: all up-to-date

transitive dev_dependencies: all up-to-date

Dependencies are all constrained to the latest resolvable versions.
Newer versions, while available, are not mutually compatible.

$ pub outdated --no-color --up-to-date
Dependencies  Current              Upgradable           Resolvable           Latest  
bar           *1.0.0 (overridden)  *1.0.0 (overridden)  *1.0.0 (overridden)  2.0.0   
foo           *1.0.0 (overridden)  *1.0.0 (overridden)  *1.0.0 (overridden)  2.0.0   

dev_dependencies: all up-to-date

transitive dependencies: all up-to-date

transitive dev_dependencies: all up-to-date

Dependencies are all constrained to the latest resolvable versions.
Newer versions, while available, are not mutually compatible.

$ pub outdated --no-color --prereleases
Dependencies  Current              Upgradable           Resolvable           Latest  
bar           *1.0.0 (overridden)  *1.0.0 (overridden)  *1.0.0 (overridden)  2.0.0   
foo           *1.0.0 (overridden)  *1.0.0 (overridden)  *1.0.0 (overridden)  2.0.0   

dev_dependencies: all up-to-date

transitive dependencies: all up-to-date

transitive dev_dependencies: all up-to-date

Dependencies are all constrained to the latest resolvable versions.
Newer versions, while available, are not mutually compatible.

$ pub outdated --no-color --no-dev-dependencies
Dependencies  Current              Upgradable           Resolvable           Latest  
bar           *1.0.0 (overridden)  *1.0.0 (overridden)  *1.0.0 (overridden)  2.0.0   
foo           *1.0.0 (overridden)  *1.0.0 (overridden)  *1.0.0 (overridden)  2.0.0   

transitive dependencies: all up-to-date

Dependencies are all constrained to the latest resolvable versions.
Newer versions, while available, are not mutually compatible.

$ pub outdated --no-color --no-dependency-overrides
Dependencies  Current              Upgradable  Resolvable  Latest  
bar           *1.0.0 (overridden)  -           -           2.0.0   
foo           *1.0.0 (overridden)  -           -           2.0.0   

dev_dependencies: all up-to-date

transitive dependencies: all up-to-date

transitive dev_dependencies: all up-to-date

Dependencies are all constrained to the latest resolvable versions.
Newer versions, while available, are not mutually compatible.

$ pub outdated --no-color --mode=null-safety
Running in 'null safety' mode.
Showing packages where the current version doesn't fully support null safety.

Dependencies  Current              Upgradable           Resolvable           Latest  
bar           ✗1.0.0 (overridden)  ✗1.0.0 (overridden)  ✗1.0.0 (overridden)  ✗2.0.0  
foo           ✗1.0.0 (overridden)  ✗1.0.0 (overridden)  ✗1.0.0 (overridden)  ✗2.0.0  

dev_dependencies: all fully support null safety

transitive dependencies: all fully support null safety

transitive dev_dependencies: all fully support null safety

Dependencies are all constrained to the latest resolvable versions.
Newer versions, while available, are not mutually compatible.

$ pub outdated --json --mode=null-safety
{
  "packages": [
    {
      "package": "bar",
      "current": {
        "version": "1.0.0",
        "overridden": true,
        "nullSafety": false
      },
      "upgradable": {
        "version": "1.0.0",
        "overridden": true,
        "nullSafety": false
      },
      "resolvable": {
        "version": "1.0.0",
        "overridden": true,
        "nullSafety": false
      },
      "latest": {
        "version": "2.0.0",
        "nullSafety": false
      }
    },
    {
      "package": "foo",
      "current": {
        "version": "1.0.0",
        "overridden": true,
        "nullSafety": false
      },
      "upgradable": {
        "version": "1.0.0",
        "overridden": true,
        "nullSafety": false
      },
      "resolvable": {
        "version": "1.0.0",
        "overridden": true,
        "nullSafety": false
      },
      "latest": {
        "version": "2.0.0",
        "nullSafety": false
      }
    }
  ]
}