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Transcribe Audio Files with Fun-ASR RESTful API

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Parameters and interface details for the Fun-ASR HTTP API used to transcribe audio files.

User guide: Non-real-time speech recognition. For supported audio formats, file size limits, duration limits, and other input requirements, see Audio specifications.

Asynchronous DashScope API

How it works

A synchronous DashScope call sends a request and returns the result in the same response. The asynchronous mode is designed for long audio files or jobs that take a while to finish. Instead of one request, it uses a two-step submit-and-poll workflow that avoids request timeouts:

  1. Step 1: Submit the task.
    • The client sends an asynchronous request.

    • After the server validates the request, it creates the task and returns a unique task_id rather than running the job right away.

  2. Step 2: Get the result.
    • Use the task_id to call the query endpoint, polling until the task finishes.

    • When the task completes, the query endpoint returns the final recognition result.

Service endpoints

China (Beijing)

Singapore

Submit task: POST https://dashscope.aliyuncs.com/api/v1/services/audio/asr/transcription

Query task: GET https://dashscope.aliyuncs.com/api/v1/tasks/{task_id}

Submit task: POST https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/services/audio/asr/transcription

Query task: GET https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/tasks/{task_id}

Replace WorkspaceId with your actual Workspace ID.

Singapore

China (Beijing)

Submit task: POST https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/services/audio/asr/transcription

Query task: GET https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/tasks/{task_id}

Replace WorkspaceId with your actual Workspace ID.

Submit task: POST https://dashscope.aliyuncs.com/api/v1/services/audio/asr/transcription

Query task: GET https://dashscope.aliyuncs.com/api/v1/tasks/{task_id}

Important

The legacy domain https://dashscope-intl.aliyuncs.com for the Singapore region will be deprecated soon. Please migrate to the new domain https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com as soon as possible.

Important

When submitting tasks using the new endpoint (https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com), you must include the parameters object in the request body. Even if you do not need to set any parameters, you must pass an empty object {}. Otherwise, the task can be submitted successfully, but the recognition will fail.

Request headers

ParameterTypeRequiredDescription
ParameterTypeRequiredDescription
AuthorizationstringYesAuthentication token in the format Bearer <your_api_key>. Replace "<your_api_key>" with your actual API key. Required for both the submit-task and query-task endpoints.
Content-TypestringYesMedia type of the request body. Required only for the submit-task endpoint. Fixed value: application/json.
X-DashScope-AsyncstringYesAsynchronous task flag. Required only for the submit-task endpoint. Fixed value: enable. The task fails to submit if this header is missing.

Submit task

Submits a speech recognition task. The endpoint returns asynchronously; your application polls the task status using the Query task.

#### Request bodyThe following URL is for the Singapore region. Replace WorkspaceId with your actual workspace ID. The URLs vary by region. curl curl --location 'https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/services/audio/asr/transcription' \ --header "Authorization: Bearer $DASHSCOPE_API_KEY" \ --header "Content-Type: application/json" \ --header "X-DashScope-Async: enable" \ --data '{ "model": "fun-asr", "input": { "file_urls": [ "https://dashscope.oss-cn-beijing.aliyuncs.com/samples/audio/paraformer/hello_world_female2.wav" ] }, "parameters": { "channel_id": [0] } }'
modelstring (Required) The model used to transcribe the audio or video file. Valid values: - fun-asr - fun-asr-2025-11-07 - fun-asr-2025-08-25 - fun-asr-mtl - fun-asr-mtl-2025-08-25
inputobject (Required) The input parameter object. Properties file_urlsarray[string] (Required) A list of URLs that point to audio or video files. Supports HTTP and HTTPS. A single request accepts only 1 URL. When the audio file is stored in Alibaba Cloud OSS, the RESTful API also accepts temporary URLs prefixed with oss://. Important - Temporary URLs expire after 48 hours. Do not use them in production. - The file upload credential endpoint is rate-limited to 100 QPS, and the limit cannot be raised. Do not use it for production, high-concurrency, or stress-testing scenarios. - For production, store files in stable storage such as Alibaba Cloud OSS to keep them available long-term and to avoid throttling. - If the OSS temporary URL is not publicly accessible, set X-DashScope-OssResourceResolve to enable in Request headers (this approach is not recommended). The Java SDK and Python SDK do not support custom request headers.
parametersobject(Optional) The request parameter object. Important When using the new endpoint (https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com), the parameters field is required. Even if you do not need to set any parameters, you must pass an empty object {}. Otherwise, the task can be submitted successfully, but the recognition result will show as failed. Properties vocabulary_idstring(Optional) The hot-words ID. Hot words associated with this ID take effect for the current recognition request. Disabled by default. For usage details, see Custom hotwords. channel_idarray[integer](Optional) Specifies the indexes of the audio tracks to recognize in a multi-track audio file. Indexes start at 0. For example, [0] recognizes the first track, and [0, 1] recognizes the first and second tracks simultaneously. If you omit this parameter, only the first track is processed. Important Each specified track is billed separately. For example, requesting [0, 1] for a single file generates two separate charges. Default value: [0]. special_word_filterstring(Optional) Specifies the sensitive words to handle during speech recognition. You can configure different handling actions for individual sensitive words. For details, see Sensitive word filter. diarization_enabledboolean(Optional) Whether to enable speaker diarization. Disabled by default. Applies only to mono audio. Speaker diarization is not supported for multi-channel audio. When enabled, the recognition result includes a speaker_id field that distinguishes individual speakers. Note When speaker diarization is enabled, keep the audio duration under 2 hours. Longer audio may cause recognition failures or timeouts. For an example that uses speaker_id, see Recognition result. Default value: false. speaker_countinteger(Optional) Important Effective only when speaker diarization is enabled (diarization_enabled set to true). A reference value for the number of speakers. Valid range: integers from 2 to 100, inclusive. By default, the algorithm detects the speaker count automatically. Setting this value guides the algorithm toward the specified count, but the exact count is not guaranteed. language_hintsarray[string](Optional) The language code for recognition. If the source language is unknown, leave it unset and the model detects the language automatically. The system reads only the first value in the array. Any extra values are ignored. Click to view the supported language codes - fun-asr, fun-asr-2025-11-07, fun-asr-mtl, fun-asr-mtl-2025-08-25: - zh: Chinese - en: English - ja: Japanese - ko: Korean - vi: Vietnamese - th: Thai - id: Indonesian - ms: Malay - tl: Filipino - hi: Hindi - ar: Arabic - fr: French - de: German - es: Spanish - pt: Portuguese - ru: Russian - it: Italian - nl: Dutch - sv: Swedish - da: Danish - fi: Finnish - no: Norwegian - el: Greek - pl: Polish - cs: Czech - hu: Hungarian - ro: Romanian - bg: Bulgarian - hr: Croatian - sk: Slovak - fun-asr-2025-08-25: - zh: Chinese - en: English
#### Response bodyjson { "output": { "task_status": "PENDING", "task_id": "c2e5d63b-96e1-4607-bb91-************" }, "request_id": "77ae55ae-be17-97b8-9942--************" }
request_idstring A unique identifier for this request.
outputobject The data returned for the submitted task. Properties task_idstring The task ID. Pass it as the string when calling the Query task. task_statusstring The task status. After successful submission, the value is PENDING.

Query task

Returns the execution status and results of a speech recognition task. Poll this endpoint until the task reaches a terminal state.

#### Request bodyThe following URL is for the Singapore region. Replace WorkspaceId with your actual workspace ID. The URLs vary by region. curl curl --location 'https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/tasks/{task_id}' \ --header "Authorization: Bearer $DASHSCOPE_API_KEY"
task_idstring (Required) Important This is a URL path parameter. The request has no body. The ID of the task to query. The value is the task_id returned by Submit task.
#### Response bodySuccess example Failure example json { "request_id": "f9e1afad-94d3-997e-a83b-************", "output": { "task_id": "f86ec806-4d73-485f-a24f-************", "task_status": "SUCCEEDED", "submit_time": "2024-09-12 15:11:40.041", "scheduled_time": "2024-09-12 15:11:40.071", "end_time": "2024-09-12 15:11:40.903", "results": [ { "file_url": "https://dashscope.oss-cn-beijing.aliyuncs.com/samples/audio/paraformer/hello_world_female2.wav", "transcription_url": "https://dashscope-result-bj.oss-cn-beijing.aliyuncs.com/pre/filetrans-16k/20240912/15%3A11/409a4b92-445b-4dd8-8c1d-f110954d82d8-1.json?Expires=1726211500&OSSAccessKeyId=yourOSSAccessKeyId&Signature=v5Owy5qoAfT7mzGmQgH0g8C****%3D", "subtask_status": "SUCCEEDED" } ], "task_metrics": { "TOTAL": 1, "SUCCEEDED": 1, "FAILED": 0 } }, "usage": { "duration": 9 } } json { "task_id": "7bac899c-06ec-4a79-8875-xxxxxxxxxxxx", "task_status": "SUCCEEDED", "submit_time": "2024-12-16 16:30:59.170", "scheduled_time": "2024-12-16 16:30:59.204", "end_time": "2024-12-16 16:31:02.375", "results": [ { "file_url": "https://dashscope.oss-cn-beijing.aliyuncs.com/samples/audio/sensevoice/rich_text_exaple_1.wav", "code": "InvalidFile.DownloadFailed", "message": "The audio file cannot be downloaded.", "subtask_status": "FAILED" } ], "task_metrics": { "TOTAL": 1, "SUCCEEDED": 0, "FAILED": 1 } }
request_idstring A unique identifier for this request.
outputobject The data returned by the query. Properties task_idstring The ID of the task being queried. task_statusstring The status of the task being queried. Note When the task contains multiple subtasks, the overall SUCCEEDED status indicates that at least one subtask succeeded. Check the subtask_status field for the result of each subtask. submit_timestring The time when the task was submitted. scheduled_timestring The time when the task was scheduled to run. end_timestring The time when the task ended. resultsarray[object] A list of subtask results, one entry per audio file to be recognized. Properties subtask_statusstring The status of the subtask. file_urlstring The URL of the file processed by this transcription subtask. transcription_urlstring A link to the recognition result. The link is valid for 24 hours. After it expires, you cannot query the task or download the result through the previously returned URL. The recognition result is saved as a JSON file. Download the file through the link, or read the file content directly over HTTP. For the meaning of each field in the JSON data, see Recognition result. codestring Important Returned only when the subtask fails. The error code for the failed subtask. messagestring Important Returned only when the subtask fails. The error message for the failed subtask. task_metricsobject A summary of the overall task execution. Properties TOTALinteger The total number of subtasks. SUCCEEDEDinteger The number of subtasks that succeeded. FAILEDinteger The number of subtasks that failed.

More operations: batch query and cancel

For details, see Manage asynchronous tasks. The endpoint supports batch queries for audio recognition tasks submitted in the past 24 hours, and lets you cancel tasks that are still in the PENDING (queued) state.

Recognition result

The recognition result is saved as a JSON file.

Click to view a recognition result example

json
{
    "file_url":"https://dashscope.oss-cn-beijing.aliyuncs.com/samples/audio/paraformer/hello_world_female2.wav",
    "properties":{
        "audio_format":"pcm_s16le",
        "channels":[\
            0\
        ],
        "original_sampling_rate":16000,
        "original_duration_in_milliseconds":3834
    },
    "transcripts":[\
        {\
            "channel_id":0,\
            "content_duration_in_milliseconds":3720,\
            "text":"Hello world, this is Alibaba Speech Lab.",\
            "sentences":[\
                {\
                    "begin_time":100,\
                    "end_time":3820,\
                    "text":"Hello world, this is Alibaba Speech Lab.",\
                    "sentence_id":1,\
                    "speaker_id":0, // This field is displayed only when automatic speaker diarization is enabled.\
                    "words":[\
                        {\
                            "begin_time":100,\
                            "end_time":596,\
                            "text":"Hello ",\
                            "punctuation":""\
                        },\
                        {\
                            "begin_time":596,\
                            "end_time":844,\
                            "text":"world",\
                            "punctuation":", "\
                        }\
                        // Other content is omitted here.\
                    ]\
                }\
            ]\
        }\
    ]
}

The key parameters are as follows:

ParameterTypeDescription
ParameterTypeDescription
audio_formatstringThe format of the audio in the source file.
channelsarray[integer]The audio track index information in the source file. Returns [0] for single-track audio, [0, 1] for dual-track audio, and so on.
original_sampling_rateintegerThe sample rate of the audio in the source file (Hz).
original_duration_in_millisecondsintegerThe original duration of the audio in the source file (ms).
channel_idintegerThe index of the transcribed audio track, starting from 0.
content_duration_in_millisecondsintegerThe duration of the content in the audio track that is identified as speech (ms). Important Billing is based on speech content duration only (non-speech parts are not metered). Speech duration is typically shorter than total audio duration. The AI-based speech detection may have minor discrepancies.
transcriptstringThe paragraph-level speech transcription result.
sentencesarrayThe sentence-level speech transcription result.
wordsarrayThe word-level speech transcription result.
begin_timeintegerStart timestamp (ms).
end_timeintegerEnd timestamp (ms).
textstringThe speech transcription result.
speaker_idintegerThe index of the current speaker, starting from 0. This is used to distinguish different speakers. This field is displayed in the recognition result only when speaker diarization is enabled.
punctuationstringThe predicted punctuation mark after the word, if any.

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Asynchronous DashScope API

How it works

Service endpoints

Request headers

Submit task

Query task

More operations: batch query and cancel

Recognition result

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