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J scripts are simple ASCII text files with an .ijs file extension. Edit them with any standard editor. Two of J's standard development environments JQT and JHS have built-in editors that provide expected goodies like syntax highlighting. Many editor extensions provide J syntax highlighting. One of my favorites is the J Language Support Visual Studio Code extension. It can be found in GitHub here and installed from the standard Visual Studio Code Marketplace.
Despite the ubiquity of J oriented text editors and script handling tools I store all my J code, test cases, and documentation in a coding tool I developed called JOD. JOD is a refactoring tool. It lets you easily reuse J words in arbitrary contexts without error prone cut-and-pasting or rampant over-inclusion. I use JOD from three J environments, jconsole, JHS, and JQT. JOD is one of many J addons. It can be installed with the J pacman utility. JOD has been entirely programmed in J and is a good example of using J to build larger systems. JOD source code is on Github. See The JOD Page for more about JOD.
In the following examples I am going to assume JOD is installed and the utilities dictionary utils is available. The latest version of utils is on GitHub here.