The git hook that checks validity of .json files in the repository

pre-commit

#!/bin/bash
exec 1>&2

git diff --cached --name-only --diff-filter=d -z HEAD | while IFS= read -r -d '' file ; do
    if [ "${file##*.}" = "json" ]; then
        if ! cat $file | python -m json.tool > /dev/null; then
           echo $file
           exit 1
        fi
    fi
done