Youtube Video Transcript Translator

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Extracts YouTube transcripts and translates them using lingo.dev. Built with Crawlee + Cheerio for fast transcript extraction and the lingo.dev SDK for high-quality translations. Ideal for educators, learners, and platforms needing multilingual subtitles at scale.

Features

• Extracts available YouTube captions (public videos).
• Translates each subtitle line using lingo.dev (BCP-47 locales).
• Batch processing via Request List UI.
• Outputs full translated transcript to an Apify dataset (JSON).
• Lightweight, scalable, and suitable for automation.

Quick start

1. Install:

$npminstall

2. Prepare input: storage/key_value_stores/default/INPUT.json (example below).
3. Set API key (recommended):

• PowerShell:

$env:LINGODOTDEV_API_KEY="sk-XXX"
apify run

4. Run:

$apify run

Input example

{
"youtubeVideoUrls":[{"url":"https://www.youtube.com/watch?v=dQw4w9WgXcQ"}],
"maxRequestsPerCrawl":100,
"sourcelocale":null,
"targetLocale":"es",
"LINGODOTDEV_API_KEY":"YOUR_KEY"
}

Output

Saved to dataset per video:

• videoUrl, videoId, sourceLocale, targetLocale
• transcript (array of {start, duration, text, lang})
• transcriptPreview (string)
• transcriptLength (string)

How it works

1. Reads input list of YouTube URLs.
2. Extracts video ID and captions via a transcript library.
3. Translates lines using lingo.dev SDK.
4. Saves results to the Apify dataset.

Limitations & notes

• Only public/accessible captions supported.
• Lingo.dev may not support every locale—custom locales may fail.
• Respect YouTube ToS; avoid excessive crawling.
• For protected content consider authenticated/workflow alternatives.

Contact

Christian Obi — obiemeriachristian@gmail.com
GitHub: https://github.com/gus-host/
Portfolio: https://my-portfolio-pi-six-91.vercel.app/

License: MIT