HTTP-based APIs often encode arguments as URL path and query parameters. For example, a call to the Dropbox API’s filename search endpoint might look like:
While URL encoding seems fine for simple examples, using JSON might have some advantages.
URL paths are complicated
In the example above, the first “+” is a literal plus sign because it’s in the URL. The second “+” represents a space because it’s in the URL query component. It’s easy to confuse the two since the encoding rules are mostly the same and sometimes the library functions are name something ambiguous like “urlencode”.