Minified React Error #185 Visit GPT | How to Fix

The React Error #185 in its minified form typically appears in production builds of React where error messages are shortened to save space.

The full, unminified version of this error is:

“Elements declared directly inside a <React.StrictMode> component will be mounted twice in development mode.”

However, Error #185 is better known for indicating the following full message in development:

🔍 Full Error #185 (Unminified):

“Text content does not match. Server: ‘X’ Client: ‘Y'”

This means you are likely encountering a hydration mismatch in a React server-side rendered (SSR) app (like with Next.js).

💥 What This Error Means

This happens when:

• The content rendered on the server differs from what React renders on the client.

• This causes React to throw a hydration warning or error, because it expects the client to match the pre-rendered HTML exactly.

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✅ Common Causes

1. Non-deterministic rendering:

   • Using Math.random(), Date.now(), or other dynamic values in SSR without stabilizing them.

   • Example:

     <p>{Math.random()}</p> // Different on server vs client


2. Conditional rendering based on window, navigator, or document

   • These only exist in the browser, not on the server.

   • Example:

     <p>{window.innerWidth}</p> // Breaks SSR


3. Locale/timezone differences affecting rendered text.

4. Asynchronous data not resolved in time for initial render.

🛠️ How to Fix It

1. Use useEffect for browser-only logic

This ensures code runs after hydration, so it doesn’t break the server-client match.

2. Guard browser-only code

3. Stabilize any randomness

Avoid rendering random numbers or dates directly in the initial SSR render.

🧪 How to Debug It

You can view the full unminified error by:

• Going to: https://reactjs.org/docs/error-decoder.html?invariant=185

• Add query params if needed (e.g., the differing text)