Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation

Re: Preserve the order in JSON

by Anonymous Monk
on Jul 11, 2018 at 10:52 UTC ( #1218299=note: print w/replies, xml ) Need Help??

in reply to Preserve the order in JSON

Interesting that so many people have asked why you would need to preserve the order of keys when in fact it would be a very useful feature. Right now I would need it to modify the configuration of some charts, they are displayed in PHP in the order they are found in the JSON which is in turn stored in a postgres text field. I would've wanted to create a plperl function to modify the chart config but it looks like I'm better off reading the config, modifying it in PHP then saving it back to the db.

Replies are listed 'Best First'.
Re^2: Preserve the order in JSON
by choroba (Archbishop) on Jul 11, 2018 at 10:57 UTC
    If you need to preserve the order, don't use "JSON object" (aka hash in Perl) as the data structure, use an array (or include an ordering attribute to the object).

    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
Re^2: Preserve the order in JSON
by Anonymous Monk on Oct 21, 2020 at 03:48 UTC
    I have a reason why. I have a vim command that I use that Tidies different files. :Tidy When it's perl code, it uses the Perl::Tidy. If it's JSON, then it formats it nicely using JSON::PP. Recently I've been doing comparisons of serialized JSON data (to make sure it's formatted correctly) and it would be nice if the order was maintained when being Tidied. Performance isn't critical, it's an editor command; not used in production.
      I've been using a one-liner. json_pp -f json -t json -json_opt pretty. I may end up implementing it using Hash::Ordered
      Use the ordering/sorting feature then nobody is stopping you

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1218299]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (10)
As of 2021-03-02 21:00 GMT
Find Nodes?
    Voting Booth?
    My favorite kind of desktop background is:

    Results (62 votes). Check out past polls.