Fix Lack of Resources & Rate Limiting in Nuxt
Nuxt's Nitro engine is built for speed, but naked server routes are a playground for Resource Exhaustion. Without explicit rate limiting, an attacker can flood expensive endpoints—such as complex DB queries, PDF generation, or password hashing—to pin the CPU and starve the event loop. To harden the stack, we must intercept requests at the middleware layer and enforce a strict 'leaky bucket' or 'fixed window' policy.
The Vulnerable Pattern
// server/api/expensive-report.post.ts // VULNERABLE: No throttling. A simple bash script can kill this process. export default defineEventHandler(async (event) => { const body = await readBody(event);// High-latency, resource-heavy operation const report = await generateHeavyReport(body.userId);
return { report }; });
The Secure Implementation
The vulnerable code allows an unbounded number of concurrent executions of 'generateHeavyReport', which is a classic DoS vector. The secure implementation introduces a Nitro middleware that executes before the API logic. It utilizes 'rate-limiter-flexible' to track the client's IP address and assign a 'point' cost to each request. If the IP exceeds 10 requests within a 60-second window, the middleware throws a 429 error, terminating the request cycle immediately and preserving server resources for legitimate users.
// server/middleware/rateLimiter.ts import { RateLimiterMemory } from 'rate-limiter-flexible'; import { defineEventHandler, createError, getRequestIP } from 'h3';// Initialize memory-based limiter (use Redis for distributed setups) const rateLimiter = new RateLimiterMemory({ points: 10, // 10 requests duration: 60, // per 60 seconds });
export default defineEventHandler(async (event) => { // Only protect API routes if (!event.path.startsWith(‘/api/’)) return;
const ip = getRequestIP(event, { xForwardedFor: true }) || ‘anonymous’;
try { await rateLimiter.consume(ip); } catch (rejRes) { throw createError({ statusCode: 429, statusMessage: ‘Too Many Requests - Resource Limit Exceeded’, }); } });
Your Nuxt API
might be exposed to Lack of Resources & Rate Limiting
74% of Nuxt apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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