Metamask: Ether.js BigNumber overflow when I use a contract with wei
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Metamask Ether.js BigNumber Overflow: A Smart Contract Troubleshooting Guide
As a developer working on DeFi applications, you’ve probably encountered issues related to large amounts and wei conversions. In this article, we’ll look at the BigNumber overflow issue with Metamask on Ethereum, specifically with ether.js in mind.
Problem
When a user tries to input more than 999 into their wallet, they trigger a BigNumber overflow error. This is because BigNumber.js expects numbers in a certain range (typically -2^53 to 2^53) before causing an overflow. When the input exceeds this range, the result will be rotated, resulting in incorrect conversions.
Ether.js BigNumber Issue
Ether.js provides an implementation of BigNumber that allows for arbitrary precision arithmetic. However, when using Metamask on Ethereum, the BigNumber library is not designed to handle large numbers efficiently. This can lead to performance issues and ultimately an overflow error.
Product: Use Decimal.js or another BigNumber library
To avoid the BigNumber overflow issue, it is recommended that your smart contract use a library that is more suitable for handling numbers. Two popular options are:
- Decimal.js: A JavaScript library that supports decimal arithmetic up to 1024 digits. You can easily replace BigNumber.js with Decimal.js in your code.
- BNP.js: Another popular BigNumber implementation designed specifically for Ethereum.
Here is an example of how you can modify your contract to use BNP.js:
import { BN } from @bnpjs/bn-polyfill;
// Define variables
const number = new BN('0x123456789012345678901234567890');
// Perform the conversion and save the result
new BNB().getDecimalAmount(amount);
Best Practice
- When working with large numbers, consider using a library that provides optimized BigNumber implementations, such as Decimal.js or BNP.js.
- Always validate user input to avoid unexpected errors.
- Keep your contract logic separate from the library used to process numbers. This makes it easier to switch between libraries if necessary.
Conclusion
By understanding BigNumber overflow using Metamask Ethereum, you can avoid this problem and ensure the success of your smart contracts. By exploring alternative libraries like Decimal.js or BNP.js, you can write more efficient and reliable code that handles large numbers with ease.
Additional Resources
If you want to learn more about BigNumber.js and other number processing libraries, here are some additional resources:
- [BigNumber.js Documentation](
- [Decimal.js Documentation](
- [BNP.js Documentation](