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arXiv · 2609.38012

A Function-level Dataset of Vulnerable and Fixed Source Code in JavaScript and TypeScript

Tamás Viszkok·Péter Hegedűs
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Abstract

JavaScript and TypeScript are widely used in modern web development, making their security critical; however, automated vulnerability detection is often constrained by the availability of high-quality training data. Here we present JsVul, a dataset curated from seven major sources. Unlike generic multi-language datasets that may retain noise -- such as minified code and cosmetic edits -- JsVul utilizes a language-specific pipeline. We collected pre-fix and post-fix versions of files around security fixes and, by filtering irrelevant artifacts and applying automated syntax normalization, isolated security-related changes. We ensured data integrity through multi-stage deduplication and heuristic-based labeling. Provided in a time-ordered JSONL format, JsVul supports robust model training in the JavaScript and TypeScript ecosystem and demonstrates the importance of language-aware preprocessing in building vulnerability datasets.

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Tamás Viszkok, Péter Hegedűs. 2026-09-29. A Function-level Dataset of Vulnerable and Fixed Source Code in JavaScript and TypeScript. https://arxiv.org/abs/2609.38012

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