Web Dev Trends That Drive Business Results in 2025

// components/SmartSearch.tsx
// This isn't just a search bar. It's a conversion tool.
// By providing fast, relevant, AI-powered results, we reduce user friction
// and guide them to what they're looking for, increasing the likelihood of conversion.
import { useState, useEffect } from 'react';
import { useDebounce } from '@/hooks/useDebounce';

export function SmartSearch() {
  const [query, setQuery] = useState('');
  const [results, setResults] = useState([]);
  const [isLoading, setIsLoading] = useState(false);
  
  const debouncedQuery = useDebounce(query, 300);

  useEffect(() => {
    if (debouncedQuery.length < 2) return;

    setIsLoading(true);
    searchWithAI(debouncedQuery).then(results => {
      setResults(results);
      setIsLoading(false);
    });
  }, [debouncedQuery]);

  return (
    <div className="relative">
      <input
        type="search"
        value={query}
        onChange={(e) => setQuery(e.target.value)}
        placeholder="Search anything..."
        className="w-full px-4 py-2 border rounded-lg"
      />
      
      {isLoading && (
        <div className="absolute top-full mt-2 w-full bg-white border rounded-lg p-4">
          <div className="animate-pulse">Searching...</div>
        </div>
      )}
      
      {results.length > 0 && (
        <div className="absolute top-full mt-2 w-full bg-white border rounded-lg shadow-lg">
          {results.map((result, index) => (
            <div key={index} className="p-3 hover:bg-gray-50 border-b last:border-b-0">
              <h3 className="font-medium">{result.title}</h3>
              <p className="text-sm text-gray-600">{result.snippet}</p>
              <div className="text-xs text-blue-600 mt-1">
                Relevance: {Math.round(result.confidence * 100)}%
              </div>
            </div>
          ))}
        </div>
      )}
    </div>
  );
}

async function searchWithAI(query: string) {
  const response = await fetch('/api/ai-search', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ query })
  });
  
  return response.json();
}

// api/generate-content/route.ts
import { OpenAI } from 'openai';

const openai = new OpenAI({
  apiKey: process.env.OPENAI_API_KEY,
});

export async function POST(request: Request) {
  const { type, context, userPreferences } = await request.json();
  
  const prompt = `Generate ${type} content for a user with these preferences: ${JSON.stringify(userPreferences)}. Context: ${context}`;
  
  const response = await openai.chat.completions.create({
    model: "gpt-4-turbo-preview",
    messages: [
      {
        role: "system",
        content: "You are a helpful content generator that creates personalized content based on user preferences."
      },
      {
        role: "user", 
        content: prompt
      }
    ],
    max_tokens: 500,
    temperature: 0.7,
  });

  return Response.json({
    content: response.choices[0]?.message?.content,
    generated_at: new Date().toISOString(),
  });
}

// tools/ai-code-generator.ts
export async function generateComponent(description: string, framework: 'react' | 'vue' | 'svelte') {
  const prompt = `
Generate a ${framework} component based on this description: ${description}

Requirements:
- Use TypeScript
- Include proper types
- Add accessibility attributes
- Use Tailwind CSS for styling
- Include error handling where appropriate
`;

  // This would integrate with your preferred AI service
  const code = await generateCode(prompt);
  
  return {
    code,
    filename: generateFilename(description, framework),
    dependencies: extractDependencies(code),
  };
}

export async function optimizeCode(code: string) {
  const prompt = `
Optimize this code for performance and maintainability:

${code}

Focus on:
- Performance improvements
- Better error handling
- Accessibility
- TypeScript best practices
`;

  return await generateCode(prompt);
}

// lib/performance-monitor.ts
// This class isn't just for developers. It's a business intelligence tool.
// By automatically monitoring Core Web Vitals and sending alerts, we can proactively
// fix issues that hurt user experience and, ultimately, your bottom line.
export class PerformanceMonitor {
  private static instance: PerformanceMonitor;
  private metrics: Map<string, number[]> = new Map();

  static getInstance() {
    if (!this.instance) {
      this.instance = new PerformanceMonitor();
    }
    return this.instance;
  }

  measureLCP() {
    new PerformanceObserver((list) => {
      const entries = list.getEntries();
      const lastEntry = entries[entries.length - 1];
      
      this.recordMetric('LCP', lastEntry.startTime);
      
      // Send to analytics if above threshold
      if (lastEntry.startTime > 2500) {
        this.sendAlert('LCP', lastEntry.startTime);
      }
    }).observe({ type: 'largest-contentful-paint', buffered: true });
  }

  measureINP() {
    new PerformanceObserver((list) => {
      for (const entry of list.getEntries()) {
        this.recordMetric('INP', entry.processingStart - entry.startTime);
      }
    }).observe({ type: 'event', buffered: true });
  }

  measureCLS() {
    let clsValue = 0;
    new PerformanceObserver((list) => {
      for (const entry of list.getEntries()) {
        if (!entry.hadRecentInput) {
          clsValue += entry.value;
        }
      }
      this.recordMetric('CLS', clsValue);
    }).observe({ type: 'layout-shift', buffered: true });
  }

  private recordMetric(name: string, value: number) {
    if (!this.metrics.has(name)) {
      this.metrics.set(name, []);
    }
    this.metrics.get(name)!.push(value);
  }

  private sendAlert(metric: string, value: number) {
    fetch('/api/performance-alert', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        metric,
        value,
        timestamp: Date.now(),
        url: window.location.href,
      }),
    });
  }

  getMetrics() {
    const result: Record<string, any> = {};
    for (const [name, values] of this.metrics) {
      result[name] = {
        average: values.reduce((a, b) => a + b, 0) / values.length,
        min: Math.min(...values),
        max: Math.max(...values),
        samples: values.length,
      };
    }
    return result;
  }
}

// Auto-initialize
if (typeof window !== 'undefined') {
  const monitor = PerformanceMonitor.getInstance();
  monitor.measureLCP();
  monitor.measureINP();
  monitor.measureCLS();
}

// lib/cache-manager.ts
class CacheManager {
  private cache = new Map<string, { data: any; expires: number; stale: number }>();
  private readonly STALE_WHILE_REVALIDATE = 5 * 60 * 1000; // 5 minutes
  private readonly MAX_AGE = 30 * 60 * 1000; // 30 minutes

  async get<T>(key: string, fetcher: () => Promise<T>): Promise<T> {
    const cached = this.cache.get(key);
    const now = Date.now();

    // Cache hit and not stale
    if (cached && now < cached.stale) {
      return cached.data;
    }

    // Cache hit but stale - return stale data and revalidate in background
    if (cached && now < cached.expires) {
      this.revalidateInBackground(key, fetcher);
      return cached.data;
    }

    // Cache miss or expired - fetch fresh data
    const data = await fetcher();
    this.set(key, data);
    return data;
  }

  private set<T>(key: string, data: T) {
    const now = Date.now();
    this.cache.set(key, {
      data,
      stale: now + this.STALE_WHILE_REVALIDATE,
      expires: now + this.MAX_AGE,
    });
  }

  private async revalidateInBackground<T>(key: string, fetcher: () => Promise<T>) {
    try {
      const data = await fetcher();
      this.set(key, data);
    } catch (error) {
      console.error('Background revalidation failed:', error);
    }
  }

  clear() {
    this.cache.clear();
  }

  delete(key: string) {
    this.cache.delete(key);
  }
}

export const cacheManager = new CacheManager();

// Usage
export async function getUser(id: string) {
  return cacheManager.get(`user-${id}`, async () => {
    const response = await fetch(`/api/users/${id}`);
    return response.json();
  });
}

// Modern Next.js app structure
// app/dashboard/page.tsx - Server Component by default
export default async function DashboardPage() {
  // This runs on the server
  const data = await getDashboardData();
  
  return (
    <div className="dashboard">
      <h1>Dashboard</h1>
      
      {/* Server Component - no JavaScript sent */}
      <ServerMetrics data={data.metrics} />
      
      {/* Client Component - interactive */}
      <ClientChart data={data.chartData} />
    </div>
  );
}

// components/ClientChart.tsx
'use client';
import { useState } from 'react';

export function ClientChart({ data }) {
  const [selectedPeriod, setSelectedPeriod] = useState('week');
  
  return (
    <div>
      <select 
        value={selectedPeriod}
        onChange={(e) => setSelectedPeriod(e.target.value)}
      >
        <option value="week">Week</option>
        <option value="month">Month</option>
      </select>
      <Chart data={data} period={selectedPeriod} />
    </div>
  );
}

<!-- Dashboard.svelte -->
<script lang="ts">
  import { onMount } from 'svelte';
  import Chart from './Chart.svelte';
  
  let data: DashboardData | null = null;
  let selectedPeriod = 'week';
  
  onMount(async () => {
    const response = await fetch('/api/dashboard');
    data = await response.json();
  });
  
  $: chartData = data ? processChartData(data, selectedPeriod) : null;
</script>

<div class="dashboard">
  <h1>Dashboard</h1>
  
  {#if data}
    <div class="controls">
      <select bind:value={selectedPeriod}>
        <option value="week">Week</option>
        <option value="month">Month</option>
      </select>
    </div>
    
    {#if chartData}
      <Chart {chartData} />
    {/if}
  {:else}
    <p>Loading...</p>
  {/if}
</div>

<style>
  .dashboard {
    padding: 2rem;
  }
  
  .controls {
    margin: 1rem 0;
  }
</style>

// lib/graphql-schema.ts
import { makeExecutableSchema } from '@graphql-tools/schema';

const typeDefs = `
  type User {
    id: ID!
    name: String!
    email: String!
    posts: [Post!]!
    createdAt: DateTime!
  }
  
  type Post {
    id: ID!
    title: String!
    content: String!
    author: User!
    published: Boolean!
    tags: [String!]!
    createdAt: DateTime!
  }
  
  type Query {
    users(limit: Int, offset: Int): [User!]!
    user(id: ID!): User
    posts(filter: PostFilter): [Post!]!
  }
  
  type Mutation {
    createUser(input: CreateUserInput!): User!
    createPost(input: CreatePostInput!): Post!
    publishPost(id: ID!): Post!
  }
  
  input PostFilter {
    published: Boolean
    tags: [String!]
    authorId: ID
  }
  
  input CreateUserInput {
    name: String!
    email: String!
  }
  
  input CreatePostInput {
    title: String!
    content: String!
    tags: [String!]
    authorId: ID!
  }
  
  scalar DateTime
`;

const resolvers = {
  Query: {
    users: async (_, { limit = 10, offset = 0 }) => {
      return getUsersFromDB({ limit, offset });
    },
    user: async (_, { id }) => {
      return getUserById(id);
    },
    posts: async (_, { filter }) => {
      return getPostsFromDB(filter);
    },
  },
  
  Mutation: {
    createUser: async (_, { input }) => {
      return createUserInDB(input);
    },
    createPost: async (_, { input }) => {
      return createPostInDB(input);
    },
    publishPost: async (_, { id }) => {
      return updatePostInDB(id, { published: true });
    },
  },
  
  User: {
    posts: async (user) => {
      return getPostsByAuthor(user.id);
    },
  },
  
  Post: {
    author: async (post) => {
      return getUserById(post.authorId);
    },
  },
};

export const schema = makeExecutableSchema({
  typeDefs,
  resolvers,
});

// server/trpc/router.ts
import { z } from 'zod';
import { router, publicProcedure, protectedProcedure } from './trpc';

export const appRouter = router({
  // Public endpoints
  posts: router({
    list: publicProcedure
      .input(z.object({
        limit: z.number().min(1).max(100).default(10),
        offset: z.number().min(0).default(0),
        published: z.boolean().optional(),
      }))
      .query(({ input }) => {
        return getPostsFromDB(input);
      }),
      
    byId: publicProcedure
      .input(z.string())
      .query(({ input }) => {
        return getPostById(input);
      }),
  }),
  
  // Protected endpoints
  admin: router({
    createPost: protectedProcedure
      .input(z.object({
        title: z.string().min(1).max(255),
        content: z.string().min(1),
        tags: z.array(z.string()).default([]),
      }))
      .mutation(({ input, ctx }) => {
        return createPost({
          ...input,
          authorId: ctx.user.id,
        });
      }),
      
    publishPost: protectedProcedure
      .input(z.string())
      .mutation(({ input }) => {
        return publishPost(input);
      }),
  }),
});

export type AppRouter = typeof appRouter;

// hooks/useResponsiveDesign.ts
import { useState, useEffect } from 'react';

export function useResponsiveDesign() {
  const [screenSize, setScreenSize] = useState({
    width: 0,
    height: 0,
    isMobile: false,
    isTablet: false,
    isDesktop: false,
  });

  useEffect(() => {
    function updateScreenSize() {
      const width = window.innerWidth;
      const height = window.innerHeight;
      
      setScreenSize({
        width,
        height,
        isMobile: width < 768,
        isTablet: width >= 768 && width < 1024,
        isDesktop: width >= 1024,
      });
    }

    updateScreenSize();
    window.addEventListener('resize', updateScreenSize);
    
    return () => window.removeEventListener('resize', updateScreenSize);
  }, []);

  return screenSize;
}

// Usage
export function AdaptiveComponent() {
  const { isMobile, isTablet, isDesktop } = useResponsiveDesign();
  
  return (
    <div className="adaptive-component">
      {isMobile && <MobileView />}
      {isTablet && <TabletView />}
      {isDesktop && <DesktopView />}
    </div>
  );
}

// hooks/useGestures.ts
import { useEffect, useState } from 'react';

export function useSwipeGesture(onSwipeLeft?: () => void, onSwipeRight?: () => void) {
  const [touchStart, setTouchStart] = useState(0);
  const [touchEnd, setTouchEnd] = useState(0);

  const minSwipeDistance = 50;

  const onTouchStart = (e: TouchEvent) => {
    setTouchEnd(0);
    setTouchStart(e.targetTouches[0].clientX);
  };

  const onTouchMove = (e: TouchEvent) => {
    setTouchEnd(e.targetTouches[0].clientX);
  };

  const onTouchEnd = () => {
    if (!touchStart || !touchEnd) return;
    
    const distance = touchStart - touchEnd;
    const isLeftSwipe = distance > minSwipeDistance;
    const isRightSwipe = distance < -minSwipeDistance;

    if (isLeftSwipe && onSwipeLeft) {
      onSwipeLeft();
    }
    if (isRightSwipe && onSwipeRight) {
      onSwipeRight();
    }
  };

  return {
    onTouchStart,
    onTouchMove,
    onTouchEnd,
  };
}