Ensure that bash is used.

Where the location of bash can differ from one system to another system:
/bin/bash /usr/bin/bash /usr/local/bin/bash /opt/bin/bash etc

All systems (that I know of) have the env command in the same location
/usr/bin/env

JSON.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 
 throw () {
   echo "$*" >&2