A solution to your problem would be to add a script to your git workflow, that reformats your .bib-file. One such tool is biber in toolmode.
Calling:
$ biber --tool example.bib
results in a nicely formated file called example_bibertool.bib:
@ARTICLE{bib:farzaneh,
AUTHOR = {Seyed Amir Farzaneh and Mehran Sohrabi},
BDSK-FILE-1 = {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},
DATE-ADDED = {2015-02-09 19:04:24 +0000},
DATE-MODIFIED = {2015-02-09 19:06:24 +0000},
JOURNALTITLE = {Chemical Engineering Research and Design},
KEYWORDS = {CO2 foam, heavy oil recovery, foam flood, foam stability, alkaline, surfactant screening},
PAGES = {375-389},
TITLE = {Experimental investigation of CO2-foam stability improvement by alkaline in the presence of crude oil},
VOLUME = {94},
YEAR = {2015},
}
You can now rename and commit it.
Also: biber can do much more than this (sorting, converting, recoding), just have a look at section 3.12 in the manual.
Best Answer
Mostly, it is used to allow for searching or sorting based on, surprisingly, key words. That way, if an article deals with a concept which is not part of the title, abstract, etc, you can add the key word and then it will appear in searches in your reference manager. In your case JabRef.
Frequently, the field is populated already in on-line databases.
You can also use it with biblatex to create bibliographies of words with only specific key words, for example
\printbibliography[keyword=BurnoutAppendixBib, title={Burnout Appendix}]will create a bibliography containing items only with the keyword BurnoutAppendixBib.