A good starting point for a JSON log format for nginx

nginx.conf

log_format json
  '{'
  '  "path":"/var/log/nginx/access_log.json","type":"http",'
  '  "clientip":"$remote_addr","ident":"-","auth":"$remote_user",'
  '  "timestamp":"$time_local","verb":"$request_method",'
  '  "request":"$request_uri","request_path":"$uri",'
  '  "http_version":"$server_protocol","response":"$status",'
  '  "bytes":"$body_bytes_sent",'
  '  "referrer":"$http_referer","agent":"$http_user_agent",'
  '  "xff":"$http_x_forwarded_for","request_time":"$request_time",'
  '  "http_host":"$host","accept":"$http_accept",'
  '  "accept_language":"$http_accept_language",'
  '  "language_locale":"$http_x_language_locale",'
  '  "range":"$http_range",'
  '  "scheme":"$scheme"'
  '}';
access_log /var/log/nginx/access_log.json json;