Interview Questions

Rewrites allow URL mapping without path change. Configured in next.config.js. Support external rewrites. Handle path transformation. Maintain URL appearance.

basePath sets base URL path for application. Useful for sub-path deployments. Handle path prefixing. Support path configuration.

Create middleware functions. Handle request processing. Support middleware chain. Implement custom logic. Manage middleware flow.

Validate configuration settings. Handle validation errors. Support schema validation. Implement validation strategies.

Manage middleware state. Handle state persistence. Support state sharing. Implement state patterns.

Scale configuration solutions. Handle large-scale settings. Support scaling strategies. Implement scaling patterns.

Configure deployment settings. Handle environment setup. Support deployment strategies. Implement deployment patterns.

Create comprehensive test suites. Handle test scenarios. Support testing patterns. Implement test strategies.

next.config.js is used for custom Next.js configuration. Supports various options like rewrites, redirects, environment variables. Exports configuration object or function.

Add custom headers using headers in next.config.js. Support security headers, CORS headers. Handle header conditions. Implement header policies.

Implement error handling in middleware. Support error recovery. Handle error responses. Implement logging. Manage error states.

Optimize build settings in next.config.js. Handle bundling options. Support optimization flags. Implement build strategies.

Create middleware tests. Handle test scenarios. Support integration testing. Implement test strategies.

Manage multiple configurations. Handle environment-specific settings. Support configuration versioning. Implement management strategies.

Create logging solutions. Handle log management. Support log analysis. Implement logging strategies.

Middleware runs before request is completed. Enables custom code execution between request and response. Can modify response, redirect requests, add headers. Defined in middleware.ts file.

Environment variables configured in .env files. Support different environments (.env.local, .env.production). Access via process.env. NEXT_PUBLIC_ prefix for client-side access.

Matcher defines paths where middleware runs. Uses path matching patterns. Support multiple matchers. Handle path exclusions. Configure middleware scope.

Customize webpack config in next.config.js. Modify loaders, plugins, optimization settings. Support module customization. Handle build process.

Configure allowed image domains in next.config.js. Support external image optimization. Handle domain whitelist. Implement image security.

Compose multiple middleware functions. Handle execution order. Support middleware chaining. Implement composition patterns.

Handle module aliases. Support path mapping. Configure module imports. Implement resolution strategies.

Handle response compression. Support compression options. Configure compression settings. Implement optimization strategies.

Create complex middleware solutions. Handle advanced scenarios. Support pattern composition. Implement advanced strategies.

Create security-focused middleware. Handle security measures. Support security policies. Implement protection strategies.

Configure redirects in next.config.js using redirects array. Support permanent/temporary redirects. Handle path matching. Implement redirect conditions.

Configure CORS settings. Handle cross-origin requests. Support CORS headers. Implement security policies.

Create middleware documentation. Generate config docs. Support example usage. Implement documentation updates.

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