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Why is my Next.js 16 deployment failing?
The title of an error report is not enough to identify a cause. The selected Node.js point release, build and runtime settings, bundler configuration, package-manager lockfile, architecture, and hosting mode can all matter. Start with the actual build log and the Node.js version used both to build and run the app.
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- Check the runtime. Next.js 16 requires Node.js 20.9.0 or later. A setting that says only “20.x” does not confirm the selected point release meets that minimum.
- Look for bundler messages. If the log mentions Webpack configuration or a custom Webpack setup, check whether the build command explicitly selects Webpack or Turbopack.
- Look for native binary errors. Errors saying SWC failed to load or a native binding is unavailable point toward binary compatibility or installation of optional dependencies.
- Keep glibc errors in scope. The Next.js glibc note concerns image optimization and excessive memory use, not a general runtime incompatibility.
- Check the deployment mode. A static export does not support features that require a running Next.js server.
Next.js documents Linux as a supported operating system; confirm the exact selected Node.js version and the controls available for your account and plan. Next.js installation requirements
What Node.js version does Next.js 16 need?
Next.js 16 requires Node.js 20.9.0 or later. Node.js 18.x is below that documented minimum. A major-version label such as “20.x” is not sufficient to establish compliance: verify the actual point release used for both the build and the deployed app.
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Where to check your deployment settings
Check the selected version in the deployment controls for your project rather than assuming the detected setting is the one in use. Exact dashboard labels and options can vary by account and hosting setup. Next.js installation requirements
Why does next build fail after upgrading to Next.js 16?
Next.js 16 uses Turbopack by default for both next dev and next build. If your project has a custom webpack configuration, or a plugin that adds one, the default build may fail because that configuration is not being used as expected.
Keep using Webpack for this build
If the project depends on Webpack configuration or plugins that have not been migrated, explicitly select Webpack:
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Use Turbopack
If you want to use the Next.js 16 default, migrate any custom Webpack configuration to supported Turbopack configuration and check plugins that modify Webpack. To run a Turbopack build while ignoring the Webpack configuration, use:
next build --turbopackChoose this only if ignoring the Webpack configuration will not remove behavior the app needs. Next.js describes Turbopack as stable and the default in version 16. Next.js 16 upgrade guide
How do I fix “SWC failed to load”?
SWC is a Rust-based compiler, and Next.js needs a binary compatible with the system where the build runs. A load failure can result from an incompatible architecture, a failed binary download, or optional platform-specific packages missing from the install.
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- Check the complete error. Note whether it identifies a missing SWC binary, failed download, or architecture mismatch; these point to different parts of the installation problem.
- Check the build environment’s architecture. Confirm that the installed native package is suitable for the platform used to build the app.
- Check optional dependencies. Make sure your package manager is not configured to omit optional packages that Next.js needs for its platform-specific binary.
- Inspect the lockfile’s origin. A lockfile generated on a different platform may contain only that platform’s optional packages. Review how it was created and whether it includes the packages required by the deployment environment.
Do not delete the lockfile automatically as a first fix: it can change dependency resolution without addressing the underlying issue. The right remedy depends on the error, package manager, and build platform. Next.js documents these causes and troubleshooting checks on its SWC troubleshooting page.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does Next.js have a glibc requirement?
Next.js’s self-hosting documentation says: “On glibc-based Linux systems, Image Optimization may require additional configuration to prevent excessive memory usage.” This is a specific warning about image optimization and memory. It does not establish that Next.js 16 has a general glibc incompatibility, or identify a system-library version that would cause one. Next.js self-hosting documentation
If the log reports an SWC native-binary load failure, follow the SWC and platform checks above instead of treating the glibc image-optimization note as the diagnosis. If the observed problem is excessive memory during image optimization on glibc-based Linux, investigate the image-optimization configuration and memory behavior.
Does my hosting provider support Next.js 16?
Confirm that your hosting provider supports Next.js on its managed Node.js app hosting, and check which plans and deployment settings are available. VPS and dedicated-server hosting may require manual configuration. General framework support does not confirm that every plan, setting, or app feature is available in the same way.
Choose deployment mode around the app
| Deployment path | Control and setup | Next.js feature support |
|---|---|---|
| Managed Node.js web app hosting | Dashboard-managed deployment with selected Node.js version choices; available plan options vary by provider. | A Node.js server can support Next.js server features. Confirm the actual plan and settings against the app’s requirements. |
| VPS or dedicated server | More direct control over runtime and system dependencies, with manual configuration required. | A Node.js server or Docker deployment can support all features described by Next.js’s deployment guide. |
| Static export | Serves exported static output rather than a running Next.js server. | Limited feature support; it does not provide features that require a server. |
Next.js’s deployment guide distinguishes full-featured Node.js server and Docker deployments from static export, which has limited feature support. Pick a path based on the features the app needs and the level of system control the hosting plan provides. Next.js deployment options
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