AI code hallucination checker: verify AI code before you ship
ChatGPT, Claude, Gemini, and Copilot all invent API methods, parameter names, and library behavior. This is the verification workflow that catches them before production.
Why Any AI model produces these errors
AI coding tools are trained on historical code repositories, documentation snapshots, and Stack Overflow content from across many SDK versions. When a library updates its API — renaming a method, deprecating a parameter, changing a return type — the AI's training data continues to reflect the old version. The AI confidently generates code from its training distribution, which may be months or years behind the current SDK state.
Impact if not caught
The cost of AI code hallucinations compounds through the development cycle: a wrong method name discovered in code review is cheap to fix; the same error discovered in a production incident involving customer data is not. API credential handling errors and authentication configuration errors — both common AI hallucination targets — have direct security implications.
Live example — what this looks like
The example below is an illustrative recreation of the type of error this AI commonly produces — not a transcript of an actual AI session.
How do I make an authenticated request with the GitHub REST API using Octokit.js?
Using Octokit.js v4+, authenticate and make requests like this: `const octokit = new Octokit({ auth: token }); const result = await octokit.repos.get({ owner: 'user', repo: 'myrepo' });`. The `repos.get()` method returns full repository metadata.
Method path changed: In Octokit.js v4+, the REST API methods are accessed through `octokit.rest.repos.get()`, not `octokit.repos.get()`. The pre-v4 path was deprecated and removed. This code will throw `TypeError: octokit.repos is not a function`.
Verol highlights the specific claim and shows you what's wrong — automatically, before you finish reading.
How to verify code & api suggestions manually
Never rely on Stack Overflow answers or AI-generated code for SDK method paths. Check the official documentation or GitHub repository README for your exact installed version.
Use GitHub's search within the repository to find the exact method. If it's not in the source code, it doesn't exist in that version.
Run `npm list [package]` or `pip show [package]` to confirm your installed version, then verify the AI's code against that specific version's documentation — not the latest.
Or skip the manual steps — Verol does this automatically
Verol works in your browser alongside Any AI model. It extracts every verifiable claim in the response and checks each one against primary sources in real time — before you finish reading. No extra steps, no copy-pasting.
Try Verol Free →Free plan available · Works on Any AI model, plus ChatGPT, Claude, Gemini & more