Strategies for troubleshooting a Next.js hydration issue that exclusively appears during the deployment phase

I am encountering an issue with my Next.js app deployment on Vercel. While running 'next dev', there are no hydration errors, but when deployed to Vercel, the production build displays multiple minified React errors.

The challenge I'm facing is that I'm unsure how to debug these errors since the minified nature of the React error messages provides limited helpful information.

Is there a way to disable error minification in this scenario or obtain a proper stack trace for troubleshooting?

Answer №1

Regrettably, troubleshooting hydration errors can be quite challenging. I had to isolate the issue by disabling components one by one and conducting tests. Eventually, I discovered that the problem stemmed from utilizing

const formatCurrency = new Intl.NumberFormat(undefined,
   { style: "currency", currency: price.currency }
);

I realized that it was necessary to define the locale in order for it to be consistent between the server and client:

const formatCurrency = new Intl.NumberFormat(process.env.NEXT_PUBLIC_LNG ?? "de",
   { style: "currency", currency: price.currency }
);

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