Node-API provides APIs to encapsulate JavaScript capabilities as a native plug-in. It is independent of the underlying JavaScript and is maintained as part of Node.js.
Node-API (NAPI) provides APIs to encapsulate JavaScript capabilities as a native plug-in. It is independent of the underlying JavaScript and is maintained as part of Node.js.
## Supported Capabilities
## Supported Capabilities
Node-API eliminates the differences between underlying JavaScript engines and provides a set of stable interfaces.
NAPI eliminates the differences between underlying JavaScript engines and provides a set of stable interfaces.
The OpenHarmony Native API (NAPI) component optimizes the Node-API interface implementation and provides connection to underlying engines such as ArkJS. Currently, some APIs in the [Node-API](https://nodejs.org/docs/v14.9.0/api/n-api.html) standard library are supported.
The OpenHarmony Native API component optimizes the NAPI interface implementation and provides connection to underlying engines such as ArkJS. Currently, some APIs in the [Node-API](https://nodejs.org/docs/v14.9.0/api/n-api.html) standard library are supported.
## Extended Symbols of NAPI
## Symbols Extended by the OpenHarmony API Component
|Type|Symbol|Remarks|
|Type|Symbol|Description|
| --- | --- | --- |
| --- | --- | --- |
|FUNC|napi_run_script_path|Runs a JavaScript file.|
|FUNC|napi_run_script_path|Runs a JavaScript file.|
**Symbols Exported from the Standard Library**
** Symbols Exported from the NAPI Library**
|Type|Symbol|Remarks|
|Type|Symbol|Description|
| --- | --- | --- |
| --- | --- | --- |
|FUNC|napi_module_register||
|FUNC|napi_module_register|Registers the NAPI native module.|
|FUNC|napi_get_last_error_info||
|FUNC|napi_get_last_error_info|Obtains the **napi_extended_error_info** structure, which contains the latest error information.|
|FUNC|napi_throw||
|FUNC|napi_throw|Throws a JavaScript value.|
|FUNC|napi_throw_error||
|FUNC|napi_throw_error|Throws a JavaScript **Error** with text information.|
|FUNC|napi_throw_type_error||
|FUNC|napi_throw_type_error|Throws a JavaScript **TypeError** with text information.|
|FUNC|napi_throw_range_error||
|FUNC|napi_throw_range_error|Throws a JavaScript **RangeError** with text information.|
|FUNC|napi_is_error||
|FUNC|napi_is_error|Checks whether **napi_value** indicates an error object.|
|FUNC|napi_create_error||
|FUNC|napi_create_error|Creates and obtains a JavaScript **Error** with text information.|
|FUNC|napi_create_type_error||
|FUNC|napi_create_type_error|Creates and obtains a JavaScript **TypeError** with text information.|
|FUNC|napi_create_range_error||
|FUNC|napi_create_range_error|Creates and obtains a JavaScript **RangeError** with text information.|
|FUNC|napi_get_and_clear_last_exception||
|FUNC|napi_get_and_clear_last_exception|Obtains and clears the latest exception.|
|FUNC|napi_is_exception_pending||
|FUNC|napi_is_exception_pending|Checks whether an exception occurs.|
|FUNC|napi_fatal_error||
|FUNC|napi_fatal_error|Raises a fatal error to terminate the process immediately.|
|FUNC|napi_open_handle_scope||
|FUNC|napi_open_handle_scope|Creates a context environment.|
|FUNC|napi_close_handle_scope||
|FUNC|napi_close_handle_scope|Closes the context environment. After the context environment is closed, all references declared in it are closed.|
|FUNC|napi_open_escapable_handle_scope||
|FUNC|napi_open_escapable_handle_scope|Creates an escapable handle scope from which the declared values can be returned to the parent scope.|
|FUNC|napi_close_escapable_handle_scope||
|FUNC|napi_close_escapable_handle_scope|Closes the escapable handle scope passed in.|
|FUNC|napi_escape_handle||
|FUNC|napi_escape_handle|Promotes the handle to the input JavaScript object so that it is valid for the lifespan of its parent scope.|
|FUNC|napi_create_reference||
|FUNC|napi_create_reference|Creates a reference for an **Object** to extend its lifespan. The caller needs to manage the reference lifespan.|
|FUNC|napi_delete_reference||
|FUNC|napi_delete_reference|Deletes the reference passed in.|
|FUNC|napi_reference_ref||
|FUNC|napi_reference_ref|Increments the reference count for the reference passed in and returns the count.|
|FUNC|napi_reference_unref||
|FUNC|napi_reference_unref|Decrements the reference count for the reference passed in and returns the count.|
|FUNC|napi_get_reference_value||
|FUNC|napi_get_reference_value|Obtains the JavaScript **Object** associated with the reference.|
|FUNC|napi_create_array||
|FUNC|napi_create_array|Creates and obtains a JavaScript **Array**.|
|FUNC|napi_create_array_with_length||
|FUNC|napi_create_array_with_length|Creates and obtains a JavaScript **Array** of the specified length.|
|FUNC|napi_create_arraybuffer||
|FUNC|napi_create_arraybuffer|Creates and obtains a JavaScript **ArrayBuffer** of the specified size.|
|FUNC|napi_create_external||
|FUNC|napi_create_external|Allocates a JavaScript value with external data.|
|FUNC|napi_create_external_arraybuffer||
|FUNC|napi_create_external_arraybuffer|Allocates a JavaScript **ArrayBuffer** with external data.|
|FUNC|napi_create_object||
|FUNC|napi_create_object|Creates a default JavaScript **Object**.|
|FUNC|napi_create_symbol||
|FUNC|napi_create_symbol|Create a JavaScript **Symbol**.|
|FUNC|napi_create_typedarray||
|FUNC|napi_create_typedarray|Creates a JavaScript **TypeArray** from an existing **ArrayBuffer**.|
|FUNC|napi_create_dataview||
|FUNC|napi_create_dataview|Creates a JavaScript **DataView** from an existing **ArrayBuffer**.|
|FUNC|napi_create_int32||
|FUNC|napi_create_int32|Creates a JavaScript **Number** from C **int32_t** data.|
|FUNC|napi_create_uint32||
|FUNC|napi_create_uint32|Creates a JavaScript **Number** from C **uint32_t** data.|
|FUNC|napi_create_int64||
|FUNC|napi_create_int64|Creates a JavaScript **Number** from C **int64_t** data.|
|FUNC|napi_create_double||
|FUNC|napi_create_double|Creates a JavaScript **Number** from C **double** data.|
|FUNC|napi_create_string_latin1||
|FUNC|napi_create_string_latin1|Creates a JavaScript **String** from an ISO-8859-1-encoded C string.|
|FUNC|napi_create_string_utf8||
|FUNC|napi_create_string_utf8|Creates a JavaScript **String** from a UTF8-encoded C string.|
|FUNC|napi_get_array_length||
|FUNC|napi_get_array_length|Obtains the length of an array.|
|FUNC|napi_get_arraybuffer_info||
|FUNC|napi_get_arraybuffer_info|Obtains the underlying data buffer of the **ArrayBuffer** and its length.|
|FUNC|napi_get_prototype||
|FUNC|napi_get_prototype|Obtains the prototype of the specified JavaScript **Object**.|
|FUNC|napi_get_typedarray_info||
|FUNC|napi_get_typedarray_info|Obtains properties of the specified **TypedArray**.|
|FUNC|napi_get_dataview_info||
|FUNC|napi_get_dataview_info|Obtains properties of the specified **DataView**.|
|FUNC|napi_get_value_bool||
|FUNC|napi_get_value_bool|Obtains the C Boolean equivalent of the given JavaScript **Boolean**.|
|FUNC|napi_get_value_double||
|FUNC|napi_get_value_double|Obtains the C double equivalent of the given JavaScript **Number**.|
|FUNC|napi_get_value_external||
|FUNC|napi_get_value_external|Obtains the external data pointer previously passed through **napi_create_external()**.|
|FUNC|napi_get_value_int32||
|FUNC|napi_get_value_int32|Obtains the C int32 equivalent of the given JavaScript **Number**.|
|FUNC|napi_get_value_int64||
|FUNC|napi_get_value_int64|Obtains the C int64 equivalent of the given JavaScript **Number**.|
|FUNC|napi_get_value_string_latin1||
|FUNC|napi_get_value_string_latin1|Obtains the ISO-8859-1-encoded string corresponding to the given JavaScript value.|
|FUNC|napi_get_value_string_utf8||
|FUNC|napi_get_value_string_utf8|Obtains the UTF8-encoded string corresponding to the given JavaScript value.|
|FUNC|napi_get_value_uint32||
|FUNC|napi_get_value_uint32|Obtains the C uint32 equivalent of the given JavaScript **Number**.|
|FUNC|napi_get_boolean||
|FUNC|napi_get_boolean|Obtains the JavaScript Boolean object based on the given C Boolean value.|
|FUNC|napi_get_global||
|FUNC|napi_get_global|Obtains the **global** object.|
|FUNC|napi_get_null||
|FUNC|napi_get_null|Obtains the **null** object.|
|FUNC|napi_get_undefined||
|FUNC|napi_get_undefined|Obtains the **undefined** object.|
|FUNC|napi_coerce_to_bool||
|FUNC|napi_coerce_to_bool|Forcibly converts the given JavaScript value to a JavaScript Boolean value.|
|FUNC|napi_coerce_to_number||
|FUNC|napi_coerce_to_number|Forcibly converts the given JavaScript value to a JavaScript number.|
|FUNC|napi_coerce_to_object||
|FUNC|napi_coerce_to_object|Forcibly converts the given JavaScript value to a JavaScript object.|
|FUNC|napi_coerce_to_string||
|FUNC|napi_coerce_to_string|Forcibly converts the given JavaScript value to a JavaScript string.|
|FUNC|napi_typeof||
|FUNC|napi_typeof|Obtains the JavaScript type of the given JavaScript value.|
|FUNC|napi_instanceof||
|FUNC|napi_instanceof|Checks whether the given object is an instance of the specified constructor.|
|FUNC|napi_is_array||
|FUNC|napi_is_array|Checks whether the given JavaScript value is an array.|
|FUNC|napi_is_arraybuffer||
|FUNC|napi_is_arraybuffer|Checks whether the given JavaScript value is a `ArrayBuffer`.|
|FUNC|napi_is_typedarray||
|FUNC|napi_is_typedarray|Checks whether the given JavaScript value is a **TypedArray**.|
|FUNC|napi_is_dataview||
|FUNC|napi_is_dataview|Checks whether the given JavaScript value is a **DataView**.|
|FUNC|napi_is_date||
|FUNC|napi_is_date|Checks whether the given JavaScript value is a JavaScript **Date** object.|
|FUNC|napi_strict_equals||
|FUNC|napi_strict_equals|Checks whether two JavaScript values are strictly equal.|
|FUNC|napi_get_property_names||
|FUNC|napi_get_property_names|Obtains the names of the enumerable properties of **Object** in an array of strings.|
|FUNC|napi_set_property||
|FUNC|napi_set_property|Sets a property for the given **Object**.|
|FUNC|napi_get_property||
|FUNC|napi_get_property|Obtains the requested property of the given **Object**.|
|FUNC|napi_has_property||
|FUNC|napi_has_property|Checks whether the given **Object** has the specified property.|
|FUNC|napi_delete_property||
|FUNC|napi_delete_property|Deletes the **key** property from the given **Object**.|
|FUNC|napi_has_own_property||
|FUNC|napi_has_own_property|Checks whether the given **Object** has the own property named **key**.|
|FUNC|napi_set_named_property||
|FUNC|napi_set_named_property|Sets a property with the specified name for the given **Object**.|
|FUNC|napi_get_named_property||
|FUNC|napi_get_named_property|Obtains the property with the specified name in the given **Object**.|
|FUNC|napi_has_named_property||
|FUNC|napi_has_named_property|Checks whether the given **Object** has the property with the specified name.|
|FUNC|napi_set_element||
|FUNC|napi_set_element|Sets an element at the specified index of the given **Object**.|
|FUNC|napi_get_element||
|FUNC|napi_get_element|Obtains the element at the specified index of the given **Object**.|
|FUNC|napi_has_element||
|FUNC|napi_has_element|Obtains the element if the given **Object** has an element at the specified index.|
|FUNC|napi_delete_element||
|FUNC|napi_delete_element|Deletes the element at the specified index of the given **Object**.|
|FUNC|napi_define_properties||
|FUNC|napi_define_properties|Defines multiple properties for the given **Object**.|
|FUNC|napi_call_function||
|FUNC|napi_call_function|Calls a JavaScript function in a native method, that is, native call JavaScript.|
|FUNC|napi_create_function||
|FUNC|napi_create_function|Creates a native method for JavaScript to call.|
|FUNC|napi_get_cb_info||
|FUNC|napi_get_cb_info|Obtains detailed information about the call, such as the parameters and **this** pointer, from the given callback info.|
|FUNC|napi_get_new_target||
|FUNC|napi_get_new_target|Obtains the **new.target** of the constructor call.|
|FUNC|napi_new_instance||
|FUNC|napi_new_instance|Creates an instance based on the given constructor.|
|FUNC|napi_define_class||
|FUNC|napi_define_class|Defines a JavaScript class corresponding to the C++ class.|
|FUNC|napi_wrap||
|FUNC|napi_wrap|Wraps a native instance in a JavaScript object.|
|FUNC|napi_unwrap||
|FUNC|napi_unwrap|Obtains the native instance that was previously wrapped in a JavaScript object.|
|FUNC|napi_remove_wrap||
|FUNC|napi_remove_wrap|Obtains the native instance that was previously wrapped in a JavaScript object and removes the wrapping.|
|FUNC|napi_create_async_work||
|FUNC|napi_create_async_work|Creates a work object that executes logic asynchronously.|
|FUNC|napi_delete_async_work||
|FUNC|napi_delete_async_work|Releases an asynchronous work object.|
|FUNC|napi_queue_async_work||
|FUNC|napi_queue_async_work|Adds an asynchronous work object to the queue so that it can be scheduled for execution.|
|FUNC|napi_cancel_async_work||
|FUNC|napi_cancel_async_work|Cancels the queued asynchronous work if it has not been started.|
|FUNC|napi_get_node_version||
|FUNC|napi_get_node_version|Obtains the current Node-API version.|
|FUNC|napi_get_version||
|FUNC|napi_get_version|Obtains the latest Node-API version supported when the Node.js runtime.|
|FUNC|napi_create_promise||
|FUNC|napi_create_promise|Creates a deferred object and a JavaScript promise.|
|FUNC|napi_resolve_deferred||
|FUNC|napi_resolve_deferred|Resolves a deferred object that is associated with a JavaScript promise.|
|FUNC|napi_reject_deferred||
|FUNC|napi_reject_deferred|Rejects a deferred object that is associated with a JavaScript promise.|
|FUNC|napi_is_promise||
|FUNC|napi_is_promise|Checks whether the given JavaScript value is a promise object.|
|FUNC|napi_run_script||
|FUNC|napi_run_script|Executes a string of JavaScript code.|
|FUNC|napi_get_uv_event_loop||
|FUNC|napi_get_uv_event_loop|Obtains the current libuv loop instance.|
## cl.useriam.1 API9 Authentication Result Code Class Name Change
The name of the authentication result code class of user IAM API version 9 is changed from **ResultCode** to **UserAuthResultCode**.
**Change Impacts**
Applications developed based on earlier versions are not affected. For the applications developed from this version, the class name of the error code needs to be adapted. Otherwise, the service logic is affected.
**Key API/Component Changes**
N/A
**Adaptation Guide**
Change the class name for invoking the authentication result code from **ResultCode** to **UserAuthResultCode**.
| type | 字段说明：必选字段，用来标识该参数的类型。<br/>取值范围：<br/>- BOOL<br/>- UINT8<br/>- UINT16<br/>- INT32<br/>- UINT32<br/>- UINT64<br/>- FLOAT<br/>- DOUBLE<br/>- STRING |
| type | 字段说明：必选字段，用来标识该参数的类型。<br/>取值范围：<br/>- BOOL<br/>- INT8<br/>- UINT8<br/>- INT16<br/>- UINT16<br/>- INT32<br/>- UINT32<br/>- INT64<br/>- UINT64<br/>- FLOAT<br/>- DOUBLE<br/>- STRING |
