Minified React error #31
Objects are not valid as a React child (Production Minified variant #31).
Usually happens because:
- ☑ Plain object variable rendered in JSX in production
- ☑ Rendering database response objects
🔍 Quick Checklist:
📊 Where this usually happens (estimated occurrence)
What is Minified React error #31?
Minified React error #31 is the production equivalent of 'Objects are not valid as a React child'. In production bundles, React minifies error messages to reduce bundle size, linking users to the React docs for details.
Common Causes
- Rendering plain objects inside JSX elements in production.
Common Mistakes
- Forgetting to check variable types before rendering in production environments.
How to Fix
Framework-Specific Examples
No framework examples required for this informational status.
Production Mismatch
const info = { msg: "Hello" };
return <div>{info}</div>;Correct: String interpolation
const info = { msg: "Hello" };
return <div>{info.msg}</div>;Best Practices
- Use TypeScript to guarantee that all JSX children are string, number, or elements.
Frequently Asked Questions (FAQ)
Q: What is Minified React error #31?
It is the production version of the 'Objects are not valid as a React child' error, triggered when you attempt to render a plain JavaScript object in JSX.
Q: Why does React minify errors?
To save bandwidth. Detailed error messages add hundreds of kilobytes of string data, which are stripped out of production builds.
Q: How do I decode minified errors?
Click the URL provided in the console error description or use the official React Error Decoder website.
Q: Does this happen for arrays?
No. React can render arrays of elements natively, only rejecting plain objects.