> ## Documentation Index > Fetch the complete documentation index at: https://docs.apinizer.com/llms.txt > Use this file to discover all available pages before exploring further. # API Traffic Log Record Data Structure > You can examine the data structure of API traffic log records, view field definitions, and understand the JSON format. You can learn the structure of JSON messages sent to connectors. ## Data Structure Fields | Field Name | Data/Description Stored in Field | Java Mapping Type | Field that must be enabled in settings to be included in message | | ---------- | --------------------------------- | ------------------------------------ | ---------------------------------------------------------------- | | @timestamp | Time Stamp | Instant | Definition Information | | aci | Apinizer Correlation ID | String | Definition Information | | ei | Environment ID | String | Definition Information | | pi | Project ID | String | Definition Information | | appi | Application ID | String | API Proxy Information | | appin | Application Name | String | API Proxy Information | | api | API Proxy ID | String | API Proxy Information | | apn | API Proxy Name | String | API Proxy Information | | eat | API Type | String | API Proxy Information | | aprp | API Proxy Relative Path | String | API Proxy Information | | apmi | API Proxy Method ID | String | API Proxy Information | | apmn | API Proxy Method Name | String | API Proxy Information | | xff | X Forwarded For | String | Request Information | | hr1ra | Http Request Remote Address | String | Request Information | | hr1hm | Http Request Http Method | String | Request Information | | hr1ct | Http Request Content Type | String | Request Information | | hr1pi | Http Request Path Info | String | Request Information | | uok | Username or Key | String | Request Information | | hr1cp | Http Request Context Path | String | Request Information | | hr1qs | Http Request Query String | String | Request Information (Only when "Trace" is enabled) | | hr1ru | Http Request Remote User | String | Request Information (Only when "Trace" is enabled) | | hr1rsi | Http Request Requested Session Id | String | Request Information (Only when "Trace" is enabled) | | hr1r1u | Http Request Request URI | String | Request Information (Only when "Trace" is enabled) | | hr1ce | Http Request Character Encoding | String | Request Information (Only when "Trace" is enabled) | | hr1cl | Http Request Content Length | Integer | Request Information (Only when "Trace" is enabled) | | hr1p | Http Request Protocol | String | Request Information (Only when "Trace" is enabled) | | hr1s | Http Request Scheme | String | Request Information (Only when "Trace" is enabled) | | hr1sn | Http Request Server Name | String | Request Information (Only when "Trace" is enabled) | | hr1sp | Http Request Server Port | Integer | Request Information (Only when "Trace" is enabled) | | loc | Location | GeoLocation\{Double lat, Double lon} | Request Information | | hr1rh | Http Request Remote Host | String | Request Information (Only when "Trace" is enabled) | | hr1rp | Http Request Remote Port | Integer | Request Information (Only when "Trace" is enabled) | | hr1ln | Http Request Local Name | String | Request Information (Only when "Trace" is enabled) | | hr1la | Http Request Local Address | String | Request Information (Only when "Trace" is enabled) | | hr1lp | Http Request Local Port | String | Request Information (Only when "Trace" is enabled) | | trqpt | TimeRequestPipelineTotal | Integer | Metric Information | | trspt | TimeResponsePipelineTotal | Integer | Metric Information | | rrc | RoutingRetryCount | Integer | Metric Information | | rfc | RoutingFailoverCount | Integer | Metric Information | | trt | TimeRoutingTotal | Integer | Metric Information | | tapt | TimeApiProxyTotal | Integer | Metric Information | | ch | CacheHit | Boolean | Metric Information | | sr1t | SizeRequestTotal | Integer | Metric Information | | sr2t | SizeResponseTotal | Integer | Metric Information | | sc | Status Code | Integer | Response Information | | rt | Result Type | Enum | Response Information | | et | Error Type | Enum | Response Information | | pet | Parent Error Type | Enum | Response Information | | fcrp | From Client Read Only Parameter | Map\ | Header from Client | | fcrh | From Client Read Only Header | Map\ | Param from Client | | fcrb | From Client Read Only Body | String | Body from Client | | tbap | To Backend API Parameter | Map\ | Header to Backend API | | tbah | To Backend API Header | Map\ | Parameter to Backend API | | tba | To Backend API Body | String | Body to Backend API | | fbarh | From Backend API Read Only Header | Map\ | Header from Backend API | | fbarb | From Backend API Read Only Body | String | Body from Backend API | | tch | To Client Header | Map\ | Header to Client | | tcb | To Client Body | String | Body to Client | The order of fields may change. ## Example JSON Data Example JSON data created: ```json theme={null} { "@timestamp" : "2023-10-16T14:48:07.662Z", "aci" : "", "ei" : "", "pi" : "", "appi" : "", "appin" : "", "api" : "", "apn" : "", "eat" : "REST", "aprp" : "", "apmi" : "", "apmn" : "", "xff" : "", "hr1ra" : "", "hr1hm" : "", "hr1ct" : "", "hr1pi" : "", "uok" : "", "hr1cp" : "", "ra" : "", "rrc" : 0, "rfc" : 0, "trqpt" : 20, "trspt" : 30, "trt" : 100, "tapt" : 150, "sr1t" : 100, "sr2t" : 250, "ch" : false, "sc" : 200, "et" : "APIPROXY", "pet" : "API_PROXY", "rt" : "SUCCESS", "hr1qs" : "", "hr1ru" : "", "hr1rsi" : "", "hr1r1u" : "", "hr1ce" : "", "hr1cl" : 100, "hr1p" : "", "hr1s" : "", "hr1sn" : "", "hr1sp" : 443, "loc" : { "lat" : 45.405, "lon" : 11.1617 }, "hr1rh" : "", "hr1rp" : 8443, "hr1ln" : "", "hr1la" : "", "hr1lp" : 443, "fcrp" : [ { "k" : "key1", "v" : "value1" }, { "k" : "key2", "v" : "value2" }, { "k" : "key3", "v" : "value3" } ], "fcrh" : [ { "k" : "key1", "v" : "value1" }, { "k" : "key2", "v" : "value2" }, { "k" : "key3", "v" : "value3" } ], "fcrb" : "", "tbap" : [ { "k" : "key1", "v" : "value1" }, { "k" : "key2", "v" : "value2" }, { "k" : "key3", "v" : "value3" } ], "tbah" : [ { "k" : "key1", "v" : "value1" }, { "k" : "key2", "v" : "value2" }, { "k" : "key3", "v" : "value3" } ], "tba" : "", "fbarh" : [ { "k" : "key1", "v" : "value1" }, { "k" : "key2", "v" : "value2" }, { "k" : "key3", "v" : "value3" } ], "fbarb" : "", "tch" : [ { "k" : "key1", "v" : "value1" }, { "k" : "key2", "v" : "value2" }, { "k" : "key3", "v" : "value3" } ], "tcb" : "" } ``` You can examine the list of values in the **"rt"** field in the "Result Type Values" table on the [Error Messages](/en/admin/system-settings/error-messages) page. You can examine the list of values in the **"pet"** field in the "Parent Error Type Values" table on the [Error Messages](/en/admin/system-settings/error-messages) page. You can examine the list of values in the **"et"** field in the "Error Type Values" table on the [Error Messages](/en/admin/system-settings/error-messages) page.