# 喚醒詞搭配語音控制系統：Invalid JSON payload received. Expected

**URL:** https://forum.amebaiot.com/t/invalid-json-payload-received-expected/4196
**Category:** AI
**Tags:** rtl8735b, evb-amb82, 中文
**Created:** [June 20, 2025, 7:41pm UTC](https://forum.amebaiot.com/t/invalid-json-payload-received-expected/4196 "2025-06-20T19:41:03Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![XyZ\_BoPo](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/xyz_bopo/32/2666_2.png) [@XyZ\_BoPo](https://forum.amebaiot.com/u/XyZ_BoPo)
#### Post date: [June 20, 2025, 7:41pm UTC](https://forum.amebaiot.com/t/invalid-json-payload-received-expected/4196/1 "2025-06-20T19:41:03Z")

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@Kelvin_Huang 您好  
最近在實作將 Whisper (GenAI: whisperaudio)、googletts (GenAI: googletts)、gemini (GenAI: geminiaudio) 三者的結合應用。

### 遇到的問題：

修改 geminiaudio 的 prompt 輸入後，gemini 回傳以下內容：

**Invalid JSON payload received. Expected , or ] after array value.ser", “parts”: [", “mime\_type”: "audio/m ^**

### Prompt內容如下：

String prompt =  
“你是一個語音控制自走車的AI助手。\n”  
“當使用者給出移動指令時，你需要用以下格式回應：\n”  
“自然語言確認 + {控制代碼序列}\n\n”  
“控制代碼對應：\n”  
“0 = 直行前進\n”  
“1 = 右轉前進\n”  
“2 = 左轉前進\n”  
“3 = 後退\n”  
“4 = 停車\n\n”  
“範例：\n”  
" 用戶說：先後退再右轉\n"  
" 你回應：收到指令我會先後退再右轉{3,1}\n\n"  
“請根據使用者的語音指令，用中文回應並提供對應的控制代碼序列。”;

執行方式：String fullReply = llm.geminiaudio(gemini\_api\_key, GEMINI\_FILENAME, “gemini-2.0-flash”, mp4, prompt, client);

經尋找，發現是 GenAI.cpp 中的以下三行程式碼中最後的逗號引發的JSON格式錯誤。請問這三行程式碼在最後的逗號的用途為何?

> ```
> String filePart = "{\"inline_data\": {\"data\": \"" + String(encodedData) + "\", \"mime_type\": \"audio/mp4\",},}";
> String textPart = "{\"text\": \"" + message + "\",}";
> String request = "{\"contents\": [{\"role\": \"user\", \"parts\": [" + filePart + ", " + textPart + "]}],}";
> 
> ```

---

<div class="post-metadata">

### Author: ![KevinKL](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/kevinkl/32/2632_2.png) [@KevinKL](https://forum.amebaiot.com/u/KevinKL)
#### Post date: [June 23, 2025, 6:36am UTC](https://forum.amebaiot.com/t/invalid-json-payload-received-expected/4196/2 "2025-06-23T06:36:37Z")

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Hi @XyZ_BoPo ,

您好, 我嘗試把您的問題複製一遍, 但沒看到 gemini 回傳的錯誤訊息,

其實最後的逗號可以直接拿掉, 因為沒有實際用途

謝謝