| Jam | Distribution.SPDX.LicenseId, Distribution.SPDX |
| January | Data.Time.Calendar.MonthDay, Data.Time.Calendar.Julian, Data.Time.Calendar, Data.Time |
| JasPer_2_0 | Distribution.SPDX.LicenseId, Distribution.SPDX |
| JavaScript | |
| 1 (Data Constructor) | Distribution.System |
| 2 (Data Constructor) | Language.Haskell.TH.Syntax, Language.Haskell.TH |
| javaScript | Language.Haskell.TH.Lib.Internal, Language.Haskell.TH.Lib, Language.Haskell.TH |
| JavaScriptFFI | |
| 1 (Data Constructor) | Distribution.Simple, Language.Haskell.Extension |
| 2 (Data Constructor) | GHC.LanguageExtensions, GHC.LanguageExtensions.Type, Language.Haskell.TH.LanguageExtensions, Language.Haskell.TH.Syntax, Language.Haskell.TH |
| javaStyle | Text.Parsec.Language, Text.ParserCombinators.Parsec.Language |
| JHC | Distribution.Simple.Compiler, Distribution.Simple, Distribution.Compiler |
| jhcProgram | Distribution.Simple.Program.Builtin, Distribution.Simple.Program |
| Jn# | GHC.Integer.GMP.Internals |
| join | Distribution.Compat.Prelude.Internal, Distribution.Compat.Prelude, GHC.Base, Control.Monad |
| joinCode | Language.Haskell.TH.Syntax, Language.Haskell.TH |
| joinDrive | |
| 1 (Function) | System.FilePath.Posix, System.FilePath |
| 2 (Function) | System.FilePath.Windows |
| 3 (Function) | System.OsPath.Posix.Internal |
| 4 (Function) | System.OsPath.Windows.Internal |
| 5 (Function) | System.OsPath.Posix |
| 6 (Function) | System.OsPath |
| 7 (Function) | System.OsPath.Windows |
| joinModifiers | Graphics.Win32.Window.HotKey |
| joinPath | |
| 1 (Function) | System.FilePath.Posix, System.FilePath |
| 2 (Function) | System.FilePath.Windows |
| 3 (Function) | System.OsPath.Posix.Internal |
| 4 (Function) | System.OsPath.Windows.Internal |
| 5 (Function) | System.OsPath.Posix |
| 6 (Function) | System.OsPath |
| 7 (Function) | System.OsPath.Windows |
| joinProcessGroup | System.Posix.Process.ByteString, System.Posix.Process, System.Posix.Process.PosixString, System.Posix.PosixString, System.Posix.ByteString, System.Posix |
| Jp# | GHC.Integer.GMP.Internals |
| JPL_image | Distribution.SPDX.LicenseId, Distribution.SPDX |
| JPNIC | Distribution.SPDX.LicenseId, Distribution.SPDX |
| JSON | Distribution.SPDX.LicenseId, Distribution.SPDX |
| 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, Distribution.PackageDescription |
| 2 (Function) | Distribution.Types.BuildInfo.Lens, Distribution.Types.Lens |
| julianMonthLength | Data.Time.Calendar.Julian |
| JulianYearMonthDay | Data.Time.Calendar.Julian |
| July | Data.Time.Calendar.MonthDay, Data.Time.Calendar.Julian, Data.Time.Calendar, Data.Time |
| June | Data.Time.Calendar.MonthDay, Data.Time.Calendar.Julian, Data.Time.Calendar, Data.Time |
| JUnneeded | Distribution.PackageDescription.Check |
| Just | Distribution.Compat.Prelude.Internal, Distribution.Compat.Prelude, GHC.Maybe, GHC.Base, Data.Maybe, Prelude |
| justifyLeft | |
| 1 (Function) | Data.Text |
| 2 (Function) | Data.Text.Lazy |
| justifyLeftI | Data.Text.Internal.Fusion.Common |
| justifyRight | |
| 1 (Function) | Data.Text |
| 2 (Function) | Data.Text.Lazy |
| justName | Language.Haskell.TH.Syntax |
| JustS | Data.Map.Internal |