Pass JSON object within Rest URL

I'm trying to test a Rest backend function that consumes a JSON object. The backend code is written in Python. I've tried several iterations when typing the URL in my browser during testing, but, I typically get a 400 error which leads me to think that I'm not formatting the URL correctly. For example, I've tried:

https://mybackend.url/?id=dev&reg="{ \"key\": \"some key\" }"

And other incantations. I feel like I'm not escaping the string correctly.

How can I type a Rest URL that passes a JSON object as a parameter?

Answer

You could either URL encode it e.g.,%7B%22key%22%3A%22some%20key%22%7D — https://mybackend.url/?id=dev&reg=%7B%22key%22%3A%22some%20key%22%7D

Or better base64 encode it from the client e.g., https://mybackend.url/?id=dev&reg=eyJrZXkiOiAic29tZSBrZXkifQ==

In both cases, you will have to decode the encoding in your python server. Unfortunately, browsers don’t automatically encode complex strings like JSON in query parameters.