json_log_format.conf

log_format json_logs escape=json '{'
    '"time_local":"$time_local",'
    '"remote_addr": "$remote_addr",'                            # client IP
    '"request":"$request",'                                     # full path no arguments if the request
    '"status": "$status",'                                      # response status code
    '"request_time":"$request_time",'                           # request processing time in seconds with msec resolution
    '"remote_user": "$remote_user",'                            # client HTTP username
    '"remote_port": "$remote_port",'                            # client port
    '"body_bytes_sent": "$body_bytes_sent",'                    # the number of body bytes exclude headers sent to a client
    '"bytes_sent": "$bytes_sent", '                             # the number of bytes sent to a client
    '"request_length": "$request_length", '                     # request length (including headers and body)
    '"connection_requests": "$connection_requests",'            # number of requests made in connection
    '"http_host": "$http_host", '                               # the request Host: header
    '"http_referrer":"$http_referer",'
    '"upstream": "$upstream_addr", '                            # upstream backend server for proxied requests
    '"upstream_connect_time": "$upstream_connect_time", '       # upstream handshake time incl. TLS
    '"upstream_header_time": "$upstream_header_time", '         # time spent receiving upstream headers
    '"upstream_response_time": "$upstream_response_time", '     # time spend receiving upstream body
    '"upstream_response_length": "$upstream_response_length", ' # upstream response length
    '"upstream_cache_status": "$upstream_cache_status", '       # cache HIT/MISS where applicable
    '"ssl_protocol": "$ssl_protocol", '                         # TLS protocol
    '"ssl_cipher": "$ssl_cipher", '                             # TLS cipher
    '"scheme": "$scheme", '                                     # http or https
    '"http_user_agent":"$http_user_agent"'
'}';