Turn any YouTube video into AI-ready output using just a video URL and a prompt.
This API fetches the transcript, analyzes the content, and returns a final answer in plain text or strict JSON. It is ideal for summarization, extraction, classification, review analysis, and structured data generation from YouTube videos.
Short videos are processed in one pass. Long videos are automatically chunked and merged in the background so no transcript data is lost.
Input:
Output:
Video URL + Prompt = { "answer": "❤️🔥" }
Zyla Listing Tone
Analyze YouTube videos with AI in one simple API call.
Send a YouTube video URL, your prompt, and an optional JSON schema. The API retrieves the transcript, processes the full video content, and returns a clean AI-generated response in text or structured JSON.
Built for developers who want reliable transcript-based AI outputs without handling transcript fetching, chunking, or response shaping on their own.
Why it works well:
Perfect for:
Simple in, powerful out:
Video URL + Prompt = { "answer": "structured json" }
Fetches a YouTube video transcript, runs AI on the full transcript with your prompt, and returns the result as plain text or strict JSON.
Analyze Youtube Transcript - Endpoint Features
| Object | Description |
|---|---|
Request Body |
[Required] Json |
{
"success": true,
"result": {
"inputUrl": "https://www.youtube.com/watch?v=tzruGtCBK9o",
"videoId": "tzruGtCBK9o",
"videoUrl": "https://www.youtube.com/watch?v=tzruGtCBK9o",
"status": "ok",
"output": {
"positives": [
"High-quality audio peripherals, living up to Sennheiser's legacy.",
"Significant leap in design and quality compared to previous models.",
"Beautiful hard case with useful accessories included.",
"Minimalistic and unobtrusive design.",
"Well-built construction with fabric headband and faux leather ear cups.",
"Effective touch controls for various functions.",
"Long battery life of up to 60 hours, ideal for travelers.",
"Good active noise cancellation for typical commute noises.",
"Excellent sound quality with decent clarity in mids and highs.",
"Visual EQ in the Sennheiser app allows for a balanced and high-quality listening experience.",
"Sufficient audio quality for most genres and users."
],
"negatives": [
"Headphones are not the lightest, though they do not feel cheap.",
"Construction is a bit stiff and bulky.",
"Active noise cancellation can be fatiguing over long periods.",
"Transparency mode is not very effective when audio is playing.",
"Uncomfortable fit for long periods due to tight headband and ear cups pinching ears."
]
}
},
"meta": {
"primaryModel": "mistralai/mistral-medium-3-instruct",
"fallbackModel": "z-ai/glm4.7",
"finalModel": "mistralai/mistral-medium-3-instruct",
"outputMode": "json_schema",
"fallbackUsed": false,
"chunkCount": 1,
"transcriptSegmentCount": 0,
"transcriptCharacterCount": 5021,
"llmCallCount": 1,
"successfulLlmCallCount": 1,
"llmAttemptCount": 1,
"modelsUsed": [
"mistralai/mistral-medium-3-instruct"
]
}
}
curl --location --request POST 'https://zylalabs.com/api/12410/ai+youtube+transcript+api/23479/analyze+youtube+transcript' --header 'Authorization: Bearer YOUR_API_KEY'
--data-raw '{
"videoUrl": "https://www.youtube.com/watch?v=tzruGtCBK9o",
"prompt": "Find the main positive and negative points mentioned in this video about the product, service, or topic being discussed. Use only transcript-supported evidence.",
"jsonschema": {
"title": "sentiment_points",
"type": "object",
"additionalProperties": false,
"properties": {
"positives": {
"type": "array",
"items": {
"type": "string"
}
},
"negatives": {
"type": "array",
"items": {
"type": "string"
}
}
}
}
}'
| Header | Description |
|---|---|
Authorization
|
[Required] Should be Bearer access_key. See "Your API Access Key" above when you are subscribed. |
No long-term commitment. Upgrade, downgrade, or cancel anytime.
The API returns structured data derived from YouTube video transcripts, including both pure text and strictly formatted JSON. The output contains insights based on the provided prompt and the video's content.
The key fields in the response include `success`, `result`, `inputUrl`, `videoId`, `videoUrl`, `status`, and `output`. The `output` field contains the processed insights based on the video transcript.
Users can customize their requests by providing a specific `prompt` along with the `videoUrl`. An optional `jsonschema` can also be included to define the desired structure of the output.
The response data is organized in a JSON format with a top-level object containing `success` status and a `result` object. The `result` includes metadata about the video and the processed `output` insights.
The API provides insights such as summaries, sentiment analysis, content categorization, and key points extracted from the video transcript, making it suitable for various analytical tasks.
Data accuracy is maintained through automated transcription processes and AI analysis, ensuring that the output reflects the content of the video accurately. Continuous improvements in AI models also enhance quality.
Typical use cases include content summarization, sentiment analysis for comments, data extraction for research, and generating structured insights for SaaS applications, enhancing user engagement and understanding.
Users can utilize the returned data by parsing the JSON output to extract relevant insights, integrating them into applications for analytics, or using them for content creation and research purposes.
To obtain your API key, you first need to sign in to your account and subscribe to the API you want to use. Once subscribed, go to your Profile, open the Subscription section, and select the specific API. Your API key will be available there and can be used to authenticate your requests.
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If you don’t cancel before the 7th day, your free trial will end automatically and your subscription will switch to a paid plan under the same plan you originally subscribed to, meaning you will be charged and gain access to the API calls included in that plan.
The free trial ends when you reach 50 API requests or after 7 days, whichever comes first.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes, we offer a 7-day free trial that allows you to make up to 50 API calls at no cost, so you can test our APIs without any commitment.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
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