A JSL file is a script created by SAS JMP, a data analysis software often used by engineers and scientists. It contains JMP Scripting Language (JSL) that can be run to recreate data results, extend the functionality of the software, and automate analyses. JSL files may also include metadata, such as the author, author contact information, date created, and the purpose of the script.

JSL file open in SAS JMP 14.3 To open a JSL script in JMP select File → Open..., navigate to the location of the JSL file, and click Open. To edit a JSL script in JMP, right-click the script after opening it in the left pane of the program interface, then select Edit Script. To run a JSL script in JMP, right-click the script after opening it in the left pane of the program interface, then select Run Script. Since JSL files store scripting language in plain text format, they can be opened and edited with text editors. Some examples of programs that can be used to open and edit JSL files include Microsoft Notepad and Apple TextEdit. You most likely will only encounter a JSL file if you work in a field that requires data analysis. JMP software comes with a variety of pre-made JSL scripts that can be modified. Sample JSL scripts included with JMP can be found in the "Scripts" folder in the "Samples" folder included in the installation directory of JMP. Users can also create their own scripts from scratch. Some examples of uses of the scripts include connecting to databases to retrieve data or automating the modification of data fields in a table.