Hippo already told you that the problem are duplicate keys in your JSON, but ... the answer is unfortunately more complex.

Please see

Does JSON syntax allow duplicate keys in an object?

• The short answer: Yes but is not recommended.
• The long answer: It depends on what you call valid...

So your options are:

• If you are the author of that JSON structure, please correct it.
• Otherwise it's pretty unclear how the result after conversion should look like, since Perl definitely doesn't allow (well overwrites) duplicated keys.
• If you are stuck with that format you can try to fiddle a solution with another module like JSON::Parse (see "SEE ALSO"), good luck!