| Jam | Distribution.SPDX, Distribution.SPDX.LicenseId |
| JasPer_2_0 | Distribution.SPDX, Distribution.SPDX.LicenseId |
| JavaScript | Distribution.System |
| JavaScriptFFI | Distribution.Simple, Language.Haskell.Extension |
| JHC | Distribution.Simple.Compiler, Distribution.Simple, Distribution.Compiler |
| jhcProgram | Distribution.Simple.Program.Builtin, Distribution.Simple.Program |
| join | Distribution.Compat.Prelude.Internal, Distribution.Compat.Prelude |
| JPNIC | Distribution.SPDX, Distribution.SPDX.LicenseId |
| JSON | Distribution.SPDX, Distribution.SPDX.LicenseId |
| Json | Distribution.Utils.Json |
| JsonArray | Distribution.Utils.Json |
| JsonBool | Distribution.Utils.Json |
| JsonNull | Distribution.Utils.Json |
| JsonNumber | Distribution.Utils.Json |
| JsonObject | Distribution.Utils.Json |
| JsonString | Distribution.Utils.Json |
| jsSources | |
| 1 (Function) | Distribution.Types.BuildInfo.Lens, Distribution.Types.Lens |
| 2 (Function) | Distribution.PackageDescription, Distribution.Types.BuildInfo |
| JUnneeded | Distribution.PackageDescription.Check |
| Just | Distribution.Compat.Prelude.Internal, Distribution.Compat.Prelude |