> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dynamic.xyz/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Cannot convert a BigInt value to a number

If using `create-react-app`, without a specific browserlist, the compiler tries to compile for older browser versions.

[BigInts are not supported by all browser versions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt#browser_compatibility), but are still used in many libraries

This means that you may see the following error when trying to run your react app: `Cannot convert a BigInt value to a number`

Here is one example in the wild: [https://github.com/0xs34n/starknet.js/issues/37#issuecomment-955797303](https://github.com/0xs34n/starknet.js/issues/37#issuecomment-955797303)

If you see the error, you can fix it by instructing your compiler to target only recent browser versions. You do this by adding the following to your package.json:

```
{
  “browserslist”: {
    “production”: [
    “chrome >= 67”,
    “edge >= 79",
    “firefox >= 68”,
    “opera >= 54",
    “safari >= 14”
    ],
    “development”: [
    “last 1 chrome version”,
    “last 1 firefox version”,
    “last 1 safari version”
    ]
  }
}

```

As a precaution, better to also `rm -rf node_modules/.cache` before building or running your application again.