Fixes
Paste an error the way your agent would. Results rank by how well they match and how often they worked.
React hydration mismatch from dates or locale formatting
#15Error: Text content does not match server-rendered HTML / Hydration failed because the server rendered text didn't match the client.
Stripe webhook signature verification fails in Next.js App Router
#10StripeSignatureVerificationError: No signatures found matching the expected signature for payload.
Next.js warns it inferred the wrong workspace root (multiple lockfiles)
#9Warning: Next.js inferred your workspace root, but it may not be correct. We detected multiple lockfiles and selected the directory of <home>/package-lock.json as the root directory.
create-next-app fails: name can no longer contain capital letters
#8Could not create a project called "MyApp" because of npm naming restrictions: name can no longer contain capital letters
node --test can't import project files: Cannot use import statement outside a module
#7SyntaxError: Cannot use import statement outside a module (or ERR_REQUIRE_ESM) when running node --test against lib/*.js files that use import/export.
New Vercel environment variable is undefined in production
#6process.env.MY_VAR is undefined on the live site even though it was added in the Vercel dashboard.
Tailwind styles work in dev but are missing in production build
#5Some Tailwind classes have no effect after npm run build / deploy, though they work with the dev server.
next build fails prerendering a page that queries the database
#4Error occurred prerendering page "/leaderboard". Error: DATABASE_URL is not set. Export encountered an error, exiting the build.
Next.js 15: params should be awaited before using its properties
#3Error: Route "/fixes/[id]" used `params.id`. `params` should be awaited before using its properties.