Fix BigInt Error in React

What Is the BigInt Error?

Developers working with React often hit the BigInt error unexpectedly. Understanding why it occurs is the first step to fixing it.

Why It Happens

This error occurs when BigInt values are used in contexts that don't support them, like JSON.stringify() or mixed arithmetic with regular numbers.

The Fix

const data = { id: 123456789012345678n };

// ❌ Throws: Do not know how to serialize a BigInt
// JSON.stringify(data);

// ✅ Custom replacer converts BigInt to string
JSON.stringify(data, (key, value) =>
  typeof value === 'bigint' ? value.toString() : value
);

When This Error Appears in Production

If you encounter BigInt in a live React application, the first priority is understanding the blast radius — how many users are affected? Check your error monitoring dashboard for frequency and patterns. Often, this error correlates with specific user actions, browsers, or network conditions. Implementing graceful degradation ensures your application remains usable even when this error occurs. Consider adding a retry mechanism with exponential backoff for transient failures.

Prevention

[Bugsly](https://bugsly.dev) makes tracking errors like this effortless — real-time notifications with complete stack traces.

Key Takeaways

• Always handle this error gracefully with proper error handling
• Check your environment configuration
• Test thoroughly before deploying to production