Identifying parameters accepted by API request

Question

I'm playing around with the data.gov API and was trying to reconstruct a API request from the websearch. ex: COVID-19 datasets filtered by Texas my url looks like

https://catalog.data.gov/dataset?q=COVID-19++&sort=views_recent+desc&as_sfid=AAAAAAVj354uPLWh4A-rtCGREQUj1meuoN7meraqiIpM0fYfGGWoEaGfEPqUjArih-22d-oaV26Dhfu_Id9XjdmN1nx2RQRL_KrLPw3K57Fv7P5zT9Z0HR3-ShUHdp8UvZdqXuM%3D&as_fid=8563fb05fbeea54c88ab1649dfdc5c5933f46436&ext_location=Texas&ext_bbox=-106.6501%2C25.8456%2C-93.5074%2C36.4939&ext_prev_extent=-110.390625%2C22.43134015636061%2C-89.82421875%2C37.579412513438385

and yields 36 results

But when I use just the q and ext_location parameters in the following request get a much higher result.

https://catalog.data.gov/api/3/action/package_search?q=COVID-19&ext_location=Texas

I understand that ext_bbox and ext_prev_extent are related to the spatial search and adding them to my requests gives me my expected results.

My question is how do I find the parameters that are accepted in package_search API ? (The CKAN documentation does not go into details here)

TLDR; How does one identify parameters that are accepted in an API request

Answer 1

if you can read code, PHP code, there a client API

• https://github.com/GSA/ckan-php-client/blob/7602dec864c25cfe5f3f96910cdaa8620ea6d57d/src/CKAN/OrganizationList.php

more precisely in:https://github.com/GSA/ckan-php-client/blob/7602dec864c25cfe5f3f96910cdaa8620ea6d57d/src/CKAN/CkanClient.php#L510

You should see here too:

• http://docs.ckan.org/en/latest/api/index.html

By experimentation I found these parameters: https://catalog.data.gov/dataset?tags=cases &groups= &res_format= &ext_prev_extent= &ext_bbox= &q= &organization= &sort= &ext_location= &publisher= &bureauCode= &as_sfid= &as_fid=