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+# Fault Logger
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **Note:**
+> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+## Modules to Import
+
+```
+import faultLogger from '@ohos.faultLogger'
+```
+
+## Required Permissions
+
+None
+
+## faultLogger.FaultType
+
+Enumerates the fault types.
+
+| Name| Default Value| Description|
+| -------- | -------- | -------- |
+| NO_SPECIFIC | 0 | No specific fault type.|
+| CPP_CRASH | 2 | C++ program crash.|
+| JS_CRASH | 3 | JS program crash.|
+| APP_FREEZE | 4 | Application freezing.|
+
+## faultLogger.FaultLogInfo
+
+Defines the data structure of the fault log information.
+
+| Name| Type| Description|
+| -------- | -------- | -------- |
+| pid | number | Process ID of the faulty process.|
+| uid | number | User ID of the faulty process.|
+| type | [FaultType](#faultloggerfaulttype) | Fault type.|
+| timestamp | number | Second-level timestamp when the log was generated.|
+| reason | string | Reason for the fault.|
+| module | string | Module on which the fault occurred.|
+| summary | string | Summary of the fault.|
+| fullLog | string | Full log text.|
+
+## faultLogger.querySelfFaultLog
+
+querySelfFaultLog(faultType: FaultType, callback: AsyncCallback<Array<FaultLogInfo>>) : void
+
+Obtains the fault information about the current process. This method uses a callback to return the fault information array obtained, which contains a maximum of 10 pieces of fault information.
+
+- Parameters
+  | Name| Type| Mandatory| Description|
+  | -------- | -------- | -------- | -------- |
+  | faultType | [FaultType](#faultloggerfaulttype) | Yes| Fault type.|
+  | callback | AsyncCallbackArray&lt;Array&lt;[FaultLogInfo](#faultloggerfaultloginfo)&gt;&gt; | Yes| Callback used to return the fault information array. <br/>The value is the fault information array obtained. If the value is **undefined**, an exception occurs during the information retrieval. In this case, an error string will be returned.
+
+- Example
+```
+function queryFaultLogCallback(error, value) {
+    if (error) {
+        console.info('error is ' + error);
+    } else {
+        console.info("value length is " + value.length);
+        let len = value.length;
+        for (let i = 0; i < len; i++) {
+            console.info("log: " + i);
+            console.info("Log pid: " + value[i].pid);
+            console.info("Log uid: " + value[i].uid);
+            console.info("Log type: " + value[i].type);
+            console.info("Log ts: " + value[i].ts);
+            console.info("Log reason: " + value[i].reason);
+            console.info("Log module: " + value[i].module);
+            console.info("Log summary: " + value[i].summary);
+            console.info("Log text: " + value[i].fullLog);
+        }
+    }
+}
+faultLogger.querySelfFaultLog(faultlogger.FaultType.JS_CRASH, queryFaultLogCallback);
+```
+
+## faultLogger.querySelfFaultLog
+
+querySelfFaultLog(faultType: FaultType) : Promise&lt;Array&lt;FaultLogInfo&gt;&gt;;
+
+Obtains the fault information about the current process. This method uses a promise to return the fault information array obtained, which contains a maximum of 10 pieces of fault information.
+
+- Parameters
+  | Name| Type| Mandatory| Description|
+  | -------- | -------- | -------- | -------- |
+  | faultType | [FaultType](#faultloggerfaulttype) | Yes| Fault type.|
+
+- Return values
+  | Type| Description|
+  | -------- | -------- |
+  | Promise&lt;Array&lt;[FaultLogInfo](#faultloggerfaultloginfo)&gt;&gt; | Promise used to return the fault information array. You can obtain the fault information instance in its **then()** method or use **await**. <br/>The value is the fault information array obtained. If the value is **undefined**, an exception occurs during the information retrieval.|
+
+- Example
+```
+let value = await faultLogger.querySelfFaultLog(faultlogger.FaultType.JS_CRASH);
+if (value) {
+    console.info("value length is " + value.length);
+    let len = value.length;
+    for (let i = 0; i < len; i++) {
+        console.info("log: " + i);
+        console.info("Log pid: " + value[i].pid);
+        console.info("Log uid: " + value[i].uid);
+        console.info("Log type: " + value[i].type);
+        console.info("Log ts: " + value[i].ts);
+        console.info("Log reason: " + value[i].reason);
+        console.info("Log module: " + value[i].module);
+        console.info("Log summary: " + value[i].summary);
+        console.info("Log text: " + value[i].fullLog);
+    }
+}
+```