Captions

Extract closed captions from YouTube videos via TranscriptAPI.com.

Setup

If $TRANSCRIPT_API_KEY is not set, help the user create an account (100 free credits, no card):

Step 1 — Register: Ask user for their email, generate a secure password.

node ./scripts/tapi-auth.js register --email USER_EMAIL --password SECURE_PASS --json

→ OTP sent to email. Ask user: "Check your email for a 6-digit verification code." ⚠️ SAVE THE PASSWORD — you need it again in Step 2!

Step 2 — Verify: Once user provides the OTP (use SAME password from Step 1):

node ./scripts/tapi-auth.js verify --email USER_EMAIL --password SECURE_PASS --otp CODE --json

→ Returns api_key (starts with sk_).

Step 3 — Save: Store the key (auto-configures agent + shell):

node ./scripts/tapi-auth.js save-key --key API_KEY --json

→ Ready to use. Agent runtime picks up the key automatically.

Manual option: transcriptapi.com/signup → Dashboard → API Keys.

GET /api/v2/youtube/transcript

curl -s "https://transcriptapi.com/api/v2/youtube/transcript\
?video_url=VIDEO_URL&format=json&include_timestamp=true&send_metadata=true" \
  -H "Authorization: Bearer $TRANSCRIPT_API_KEY"

| Param | Required | Default | Values | | ------------------- | -------- | ------- | ----------------------------------- | | video_url | yes | — | YouTube URL or video ID | | format | no | json | json (structured), text (plain) | | include_timestamp | no | true | true, false | | send_metadata | no | false | true, false |

Response (format=json — best for accessibility/timing):

{
  "video_id": "dQw4w9WgXcQ",
  "language": "en",
  "transcript": [
    { "text": "We're no strangers to love", "start": 18.0, "duration": 3.5 },
    { "text": "You know the rules and so do I", "start": 21.5, "duration": 2.8 }
  ],
  "metadata": { "title": "...", "author_name": "...", "thumbnail_url": "..." }
}

start: seconds from video start
duration: how long caption is displayed

Response (format=text — readable):

{
  "video_id": "dQw4w9WgXcQ",
  "language": "en",
  "transcript": "[00:00:18] We're no strangers to love\n[00:00:21] You know the rules..."
}

Tips

Use format=json for sync'd captions (accessibility tools, timing analysis).
Use format=text with include_timestamp=false for clean reading.
Auto-generated captions are available for most videos; manual CC is higher quality.

Errors

| Code | Meaning | Action | | ---- | ----------- | ----------------------------- | | 402 | No credits | transcriptapi.com/billing | | 404 | No captions | Video doesn't have CC enabled | | 408 | Timeout | Retry once after 2s |

1 credit per request. Free tier: 100 credits, 300 req/min.