RDS (sometimes "RDB") standarized formats (rds_json_format) of https://github.com/openresty/rds-json-nginx-module#rds_json_format.

• JSON-table-object: each row as a single JSON-object of key-value pairs.
  [{"id":1,"name":"marry"},{"id":2,"name":"bob"}]
• JSON-table-array: first item as header and others like CSV-lines, expressed as arrays.
  [["id","name"],[1,"marry"],[2,"bob"]]
• rds_json_root: define a root-key in the root-object, e.g. {"rows":[["id","name"],[2,null],[3,"bob"]]}

See also:

• https://github.com/openresty/rds-csv-nginx-module (standard output of CSV from SQL-database)
• https://github.com/FRiCKLE/ngx_postgres (upstream module that allows nginx to communicate directly with PostgreSQL database)
• https://github.com/auth0/nginx-jwt (Lua script for Nginx that performs reverse proxy auth using JWT's)
• https://openresty.com