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If you have to edit json files from vim, you may want to make them more
readable, here is how you can do this:

start by installing the JSON::XS perl module from the CPAN by running
=sudo cpan JSON::XS=, then, edit your .vimrc and add the following

#+BEGIN_EXAMPLE
    map <leader>jt  <Esc>:%!json_xs -f json -t json-pretty<CR>
#+END_EXAMPLE

now while editing a json file, you can hit =,jt= (or whatever your
leader is set to) and tidify a json.