This page provides a list of those file extensions that start with .j. The information given below is a summary and further details can be found by clocking on the summary next to the file extension of interest.

.jadJava Application Descriptor.
.jarJava Archive.
.javaJava source file.
.jcpESE Checkpoint file.
.jfifJPEG graphics file.
.jgwJPEG world file
.jhtmJava Server page
.jhtmlJava Server page.
.jnlCVS journal file.
.jobWindows Task Scheduler Job | Tripod Data Systems job file | MetaCAM Nest job file.
.jpeJPEG graphics file.
.jpegJPEG graphics file.
.jpgJPEG graphics file.
.jprJBuilder project file.
.jpxJBuilder project file.
.jrsReserve transaction log file.
.jsJavaScript file.
.jsfJourneyMan Session File | JavaServer Faces file.
.jsonJSON data interchange file.
.jspJava Server page.
.jtxESE log file.

For further information about the file extension please do click on the summary next to the file extension in the list above.

We would like this listing to be complete and comprehensive, but recognised that we may have missed one and that new file types are being used all the time. So if you know of a file type that we have missed that should be listed here then please let us know.