I found difference between json-data created by JavaScipt and via jq with bash (and other programming languages). With JavaScript I can create decimal numbers w
A commit made on Oct 21, 2019, ensures that jq will generally preserve the "external" format of numbers. There are some exceptions, e.g. superfluous leading 0s.
The following page gives details about installing an "unreleased" version of jq: https://github.com/stedolan/jq/wiki/Installation