AI code detector · JavaScript
Paste a JavaScript file below and get an AI-likelihood score with the snippets that drove it. Use it to decide what deserves a closer read — not to decide a case.
Compare shows two snippets side by side, each with its own screening signals, so you can see how they differ. It does not decide who copied whom. It uses 2 of your free checks.
Paste at least 10 non-empty lines in each box, then run once — both screening results come back side by side. This note shows only once.
Screening signal only. Review flagged code before you act on it.
An AI code detector for JavaScript analyzes JavaScript source code for patterns associated with AI-generated output and returns an AI-likelihood score with highlighted snippets. The result is a screening signal: it helps teachers and interviewers decide which files deserve a closer human read, not a determination of who wrote the code.
AI-written JavaScript often reads like the final answer in a tutorial: uniform ES6+ syntax throughout — arrow functions everywhere, template literals on every string, destructuring applied with machine consistency — plus React or Vue boilerplate that is suspiciously complete, with props, hooks, and comments arranged exactly as the docs show. Textbook comments explain lines that explain themselves. Tidy code is not proof of anything: Prettier configs, ESLint presets, and framework scaffolds push honest human JavaScript toward the same uniformity, and a careful student's work can trip every pattern above. That is why the report highlights the exact snippets that drove the score — so you judge the pattern in context, not in isolation.
The same tells show up in any language — here are four signals you can read by hand before you scan.
JavaScript was covered by AI-generated samples in our most recent evaluation (October 8, 2026), but human-written validation samples are still limited — scores in JavaScript are extrapolated and carry more uncertainty than scores in Python, Java, or C++. Read the limits →
Want the whole picture first? Here is what the full report looks like on a synthetic batch.
Files with fewer than 10 non-empty lines of code are not scored — very short snippets do not carry enough signal to be useful.
Yes, for single files. Paste one JavaScript file and run the check with no account. Batch uploads, saved scan history, and report export require an account — current plan details are on the pricing page.
It screens JavaScript source in general, including component files and Node scripts. Framework files carry more generated boilerplate — scaffolding, hooks, imports — so give the highlighted logic snippets more weight than the surrounding structure.
With extra care. Our most recent evaluation included AI-generated JavaScript samples but limited human-written ones, so JavaScript scores are extrapolated and carry more uncertainty. Treat a flag as a prompt for a closer manual read, and weigh the highlighted snippets over the number itself.
Read the highlighted snippets first, then compare the file with earlier work from the same author. If concern remains, ask the author to explain or extend the code. A score is a reason to look closer, never a conclusion. See /accuracy for the full review workflow.
Also available: AI code detection for Python, Java, and C++. Back to the main tool →
Run a free single-file check now. If you grade or review JavaScript regularly, batch mode scans a whole set at once.