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How to Secure a Node.js API
Protect your API endpoints with these essential techniques.
Node.js APIs are popular for their speed and scalability, but they need proper security. This guide covers authentication, rate limiting, input validation, and other essential practices for securing your Node.js API.
150+
Security checks
16
Categories covered
30s
Scan duration
100%
Detection coverage
Key Findings
Missing Authentication critical
Insecure CORS Policy medium
1. Authentication and Authorization
Use JWT (JSON Web Tokens) or session‑based authentication. JWT should be short‑lived (15‑60 minutes) with refresh tokens. Always validate JWT on the server, never trust client‑side claims. Use middleware to protect routes: `app.use("/api/protected", authenticate, authorize)`.
2. Rate Limiting
Implement rate limiting using `express-rate-limit` or `@upstash/ratelimit`. Set limits per endpoint (e.g., 100 requests per minute for public APIs, 10 per minute for login). Return a `429 Too Many Requests` status code with `Retry-After` header.
3. Input Validation
Validate all user input using `Joi`, `Zod`, `Yup`, or `express-validator`. Validate query parameters, request body, and URL parameters. Use a whitelist approach – reject unknown fields. Always validate on the server, even if you validate on the client.
4. CORS Configuration
Use `cors` middleware. Set `origin` to a whitelist of allowed domains. Never use `origin: *` in production. Set `credentials: true` only if your API supports cookies. Use `Access-Control-Allow-Credentials: true` when necessary.
5. Security Headers
Use the `helmet` middleware to set security headers automatically: CSP, HSTS, X‑Frame‑Options, X‑Content‑Type‑Options, and more. Disable the `X-Powered-By` header to hide your stack.
The Problem
Node.js APIs are vulnerable if not properly secured
- Missing authentication on protected endpoints
- No rate limiting allows brute‑force attacks
- Unvalidated input leads to injection attacks
- Insecure CORS policy exposes data
- Missing security headers
OffURL Solution
OffURL detects Node.js API vulnerabilities and provides fix steps
- Check for exposed API endpoints
- Test for rate limiting
- Detect missing authentication patterns
- Provide code examples for Node.js security
- Generate an LLM‑ready PDF for AI‑assisted fixes
Key Features
Node.js detection
We detect if your site uses Node.js.
Security patterns
We scan for common Node.js security issues.
LLM‑ready PDF
Get a report formatted for ingestion into your AI assistant.
Actionable fixes
Receive specific recommendations for your stack.
How do I check if my Node.js API is secure?
Run an OffURL audit. We scan your API endpoints for authentication, rate limiting, input validation, and CORS issues. You'll get a comprehensive report with specific fix steps.
Frequently Asked Questions
What is OffURL and how does it work?
OffURL is a comprehensive website security and performance audit tool. It scans your site for 150+ checks including SSL, security headers, malware, XSS, SQL injection, email security, and more.
Is the security audit really free?
Yes. Your first security report is completely free and includes premium features like detailed findings, fix steps, and the full 150+ checks.
How can I use AI to fix security issues?
Download the premium PDF report and paste it into your preferred LLM (Claude, ChatGPT, Gemini, Cursor) with a prompt asking for specific fixes for your framework.
How long does the security audit take?
Most audits complete in 10‑30 seconds. The scan includes DNS lookups, SSL analysis, HTTP requests, port scanning, and vulnerability tests.
Do I need to create an account?
No. OffURL works without registration. Your first audit is free with premium features included.
What vulnerabilities can OffURL detect?
OffURL detects XSS, SQL Injection, NoSQL Injection, LDAP Injection, XXE, SSRF, SSTI, Code Injection, Command Injection, Open Redirect, Path Traversal, LFI, RFI, CRLF Injection, Parameter Pollution, and CORS Misconfiguration.