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Building a Vertical Corpus Builder: Clean JSONL Datasets for LLM Fine-Tuning

Summary by DEV Community
Raw web pages are terrible training data. Nav bars, cookie banners, "related articles" and ads drown the signal, and near-identical syndicated text pollutes the corpus. If you're fine-tuning a domain model — legal reasoning, medical QA, financial analysis — you want clean vertical text with provenance, not a pile of HTML. I built an actor that goes from seed URLs to a token-aware JSONL dataset in one run. The pipeline seed URLs → crawl (same-do…
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DEV Community broke the news on Wednesday, August 19, 2026.
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