Is it possible to create a single REST API to access all the projects which are in Jira?

[AMS Support]

Is it possible to create a single REST API to access all the projects which are in Jira?.

If possible, please share me the reference link?

Also confirm how to restrict the API key access to specific data fields? 

[Nic Brough -Adaptavist-]

Start at https://developer.atlassian.com/cloud/jira/platform/rest/v3/?utm_source=%2Fcloud%2Fjira%2Fplatform%2Frest%2F&utm_medium=302#api-rest-api-3-project-search-get which is a REST call to fetch all the projects.

Same doc has instructions on requesting limited sets of fields.