Easiest way to use JSON to make a messaging app (with Parse, or another database)

I would like to make a messaging app that has photo upload capability and logons. How best to do this using JSON and a database, such as Parse or a more cost efficient database.
Thanks in advance!

I would like to make a messaging app that has photo upload capability and logons. How best to do this using JSON and a database, such as Parse or a more cost efficient database.
Thanks in advance!

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