CORS Configuration Generator

Generate secure Cross-Origin Resource Sharing (CORS) configurations for Express, Next.js, NGINX, Apache, and Spring Boot.

Output:A ready-to-use configuration file for CORS Configuration with best practices applied.

Platform/Framework

Allowed Origins (Access-Control-Allow-Origin)

Comma-separated list of allowed origins. Use '*' for public APIs (insecure for authenticated routes).

Allowed Methods (Access-Control-Allow-Methods)- Which HTTP methods are permitted.

Allowed Headers (Access-Control-Allow-Headers)

Headers the client is allowed to send in the actual request.

Expose Headers (Access-Control-Expose-Headers)

Headers the client is allowed to read from the response.

Allow Credentials (Access-Control-Allow-Credentials)- Set to true if your API uses cookies or authorization headers. Cannot be used with a wildcard (*) origin.

Max Age (Access-Control-Max-Age) in seconds

How long the results of a preflight request can be cached.

What is this tool?

Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources.

How to Use This Tool

Use the generator above to configure your settings securely.

Frequently Asked Questions

Is this secure?

Yes, all generation happens securely within your browser. No data is sent to our servers.

How We Keep Your Configs Safe & Valid

Built-in Error Checking

Every file is checked against official rules. We catch missing fields and bad syntax. YAML indentation errors are flagged right away. Kubernetes, Terraform, and Docker specs are all covered. API versions and labels are verified too. You get valid output every time you generate.

100% Private & Local

All tools run in your browser only. Your API keys never leave your machine. We do not use any tracking scripts. No data is sent to any server. Passwords and secrets stay on your device. Crypto operations use the Web Crypto API. Your privacy is fully protected at all times.

Secure Settings by Default

Configs use safe defaults out of the box. Containers run as non-root users. Root filesystems are set to read-only. Dangerous Linux capabilities are dropped. Network policies limit pod-to-pod traffic. TLS 1.3 is enabled for web servers. Security headers are added where needed.

Ready for CI/CD & Git

Output files are ready for your Git repo. Use them with ArgoCD, Flux, or GitHub Actions. Files use clear formatting and comments. Code review is easy for your team. Indentation and key order are consistent. Test in staging before going to production. Every file is clean and well-structured.

Infrastructure as Code

Store configs in Git alongside your code. Terraform modules include typed variables. Backend configs support remote state locking. Outputs work across multiple modules. Ansible playbooks use clear task steps. Chef and Puppet configs are also supported. Every file works with version control tools.

Monitoring & Tracing

Set up Prometheus with auto-discovery rules. Create Grafana dashboards with template variables. Add alerting rules with severity labels. Use OpenTelemetry for trace collection. Forward logs to Loki or Elasticsearch. Connect to Jaeger or Tempo for tracing. Monitor metrics, logs, and traces together.

Container & Docker Safety

Dockerfiles use multi-stage builds for small images. Base images are pinned to exact versions. Dev files are excluded from final images. Health checks are added for orchestrator use. Containers switch to non-root users. Docker Compose uses named volumes and networks. Resource limits are set in deploy configs.

Multiple Output Formats

Export as YAML, JSON, HCL, or TOML. Kubernetes uses YAML with proper separators. Terraform uses HCL with correct escaping. JSON output has consistent indentation. Copy to clipboard with one click. Preview output with syntax highlighting. Line numbers help you review quickly.