$ pub outdated --json
{
  "packages": [
    {
      "package": "bar",
      "current": {
        "version": "1.0.0"
      },
      "upgradable": {
        "version": "1.0.0"
      },
      "resolvable": {
        "version": "1.0.0"
      },
      "latest": {
        "version": "2.0.0"
      }
    },
    {
      "package": "fails_analysis",
      "current": {
        "version": "1.0.0"
      },
      "upgradable": {
        "version": "1.0.0"
      },
      "resolvable": {
        "version": "2.0.0"
      },
      "latest": {
        "version": "2.0.0"
      }
    },
    {
      "package": "fails_analysis_in_dependency",
      "current": {
        "version": "1.0.0"
      },
      "upgradable": {
        "version": "1.0.0"
      },
      "resolvable": {
        "version": "2.0.0"
      },
      "latest": {
        "version": "2.0.0"
      }
    },
    {
      "package": "file_in_dependency_opts_out",
      "current": {
        "version": "1.0.0"
      },
      "upgradable": {
        "version": "1.0.0"
      },
      "resolvable": {
        "version": "2.0.0"
      },
      "latest": {
        "version": "2.0.0"
      }
    },
    {
      "package": "file_opts_out",
      "current": {
        "version": "1.0.0"
      },
      "upgradable": {
        "version": "1.0.0"
      },
      "resolvable": {
        "version": "2.0.0"
      },
      "latest": {
        "version": "2.0.0"
      }
    },
    {
      "package": "foo",
      "current": {
        "version": "1.0.0"
      },
      "upgradable": {
        "version": "1.0.0"
      },
      "resolvable": {
        "version": "2.0.0"
      },
      "latest": {
        "version": "2.0.0"
      }
    }
  ]
}

$ pub outdated --no-color
Dependencies                  Current  Upgradable  Resolvable  Latest  
bar                           *1.0.0   *1.0.0      *1.0.0      2.0.0   
fails_analysis                *1.0.0   *1.0.0      2.0.0       2.0.0   
fails_analysis_in_dependency  *1.0.0   *1.0.0      2.0.0       2.0.0   
file_in_dependency_opts_out   *1.0.0   *1.0.0      2.0.0       2.0.0   
file_opts_out                 *1.0.0   *1.0.0      2.0.0       2.0.0   
foo                           *1.0.0   *1.0.0      2.0.0       2.0.0   

dev_dependencies: all up-to-date

transitive dependencies: all up-to-date

transitive dev_dependencies: all up-to-date

5  dependencies are constrained to versions that are older than a resolvable version.
To update these dependencies, edit pubspec.yaml.

$ pub outdated --no-color --up-to-date
Dependencies                  Current  Upgradable  Resolvable  Latest  
bar                           *1.0.0   *1.0.0      *1.0.0      2.0.0   
fails_analysis                *1.0.0   *1.0.0      2.0.0       2.0.0   
fails_analysis_in_dependency  *1.0.0   *1.0.0      2.0.0       2.0.0   
file_in_dependency_opts_out   *1.0.0   *1.0.0      2.0.0       2.0.0   
file_opts_out                 *1.0.0   *1.0.0      2.0.0       2.0.0   
foo                           *1.0.0   *1.0.0      2.0.0       2.0.0   

dev_dependencies: all up-to-date

transitive dependencies: all up-to-date

transitive dev_dependencies: all up-to-date

5  dependencies are constrained to versions that are older than a resolvable version.
To update these dependencies, edit pubspec.yaml.

$ pub outdated --no-color --prereleases
Dependencies                  Current  Upgradable  Resolvable  Latest  
bar                           *1.0.0   *1.0.0      *1.0.0      2.0.0   
fails_analysis                *1.0.0   *1.0.0      2.0.0       2.0.0   
fails_analysis_in_dependency  *1.0.0   *1.0.0      2.0.0       2.0.0   
file_in_dependency_opts_out   *1.0.0   *1.0.0      2.0.0       2.0.0   
file_opts_out                 *1.0.0   *1.0.0      2.0.0       2.0.0   
foo                           *1.0.0   *1.0.0      2.0.0       2.0.0   

dev_dependencies: all up-to-date

transitive dependencies: all up-to-date

transitive dev_dependencies: all up-to-date

5  dependencies are constrained to versions that are older than a resolvable version.
To update these dependencies, edit pubspec.yaml.

$ pub outdated --no-color --no-dev-dependencies
Dependencies                  Current  Upgradable  Resolvable  Latest  
bar                           *1.0.0   *1.0.0      *1.0.0      2.0.0   
fails_analysis                *1.0.0   *1.0.0      2.0.0       2.0.0   
fails_analysis_in_dependency  *1.0.0   *1.0.0      2.0.0       2.0.0   
file_in_dependency_opts_out   *1.0.0   *1.0.0      2.0.0       2.0.0   
file_opts_out                 *1.0.0   *1.0.0      2.0.0       2.0.0   
foo                           *1.0.0   *1.0.0      2.0.0       2.0.0   

transitive dependencies: all up-to-date

5  dependencies are constrained to versions that are older than a resolvable version.
To update these dependencies, edit pubspec.yaml.

$ pub outdated --no-color --no-dependency-overrides
Dependencies                  Current  Upgradable  Resolvable  Latest  
bar                           *1.0.0   *1.0.0      *1.0.0      2.0.0   
fails_analysis                *1.0.0   *1.0.0      2.0.0       2.0.0   
fails_analysis_in_dependency  *1.0.0   *1.0.0      2.0.0       2.0.0   
file_in_dependency_opts_out   *1.0.0   *1.0.0      2.0.0       2.0.0   
file_opts_out                 *1.0.0   *1.0.0      2.0.0       2.0.0   
foo                           *1.0.0   *1.0.0      2.0.0       2.0.0   

dev_dependencies: all up-to-date

transitive dependencies: all up-to-date

transitive dev_dependencies: all up-to-date

5  dependencies are constrained to versions that are older than a resolvable version.
To update these dependencies, edit pubspec.yaml.

$ 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   ✗1.0.0      ✗1.0.0      ✓2.0.0  
fails_analysis                ?1.0.0   ?1.0.0      ✓2.0.0      ✓2.0.0  
fails_analysis_in_dependency  ?1.0.0   ?1.0.0      ✓2.0.0      ✓2.0.0  
file_in_dependency_opts_out   ✗1.0.0   ✗1.0.0      ✓2.0.0      ✓2.0.0  
file_opts_out                 ✗1.0.0   ✗1.0.0      ✓2.0.0      ✓2.0.0  
foo                           ✗1.0.0   ✗1.0.0      ✗2.0.0      ✗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

5  dependencies are constrained to versions that are older than a resolvable version.
To update these dependencies, edit pubspec.yaml.

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