Online cURL Runner
Test APIs instantly without a terminal. Execute cURL commands from your browser and get immediate feedback for free.
cURL Runner
Execute cURL commands securely in a sandboxed environment
cURL Command
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What is cURL Command Runner?
Test API endpoints and HTTP requests online with our cURL runner. Support for all HTTP methods, custom headers, request bodies, and authentication. View formatted responses with syntax highlighting. No local installation required.
Perfect for:
- REST API development and testing
- Webhook endpoint validation
- Third-party API exploration
- HTTP header debugging
- Authentication flow testing
- Response format verification
- API documentation examples
- Learning HTTP protocols
✨ Key Features
- ✓Native cURL command execution in browser
- ✓Full HTTP method support: GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS
- ✓Custom headers and authentication support
- ✓Request body editor with JSON and form-data support
- ✓Formatted response output with syntax highlighting
- ✓Response time and status code metrics
- ✓Local command history storage (up to 10 entries)
- ✓CORS-friendly proxy for testing any endpoint
Why Choose Our Free cURL Command Runner?
100% Free Forever
No hidden fees, no premium tiers, no credit card required. Completely free.
Privacy First
Your data never leaves your browser. We don't track or store anything.
No Sign-up Required
Start using immediately. No registration, no email, no verification.
Free alternative to: Postman, ReqBin, HTTPie, Insomnia, Hoppscotch
How to Use cURL Command Runner Online
Get started in seconds with our simple 4-step process
Step 1
Type your full cURL command into the input editor (e.g., curl https://api.example.com).
Step 2
Add headers, methods, or body data using cURL flags (-H, -X, -d).
Step 3
Click 'Execute' button to send the request through our CORS proxy.
Step 4
Review the response body, headers, and timing metrics in the output section.
cURL Command Runner FAQ
Everything you need to know about our curl command runner
Are my API keys safe when using this tool?
▼
Yes. While requests are routed through our secure proxy to avoid CORS issues, we do not log or store any sensitive headers, API keys, or request payloads. Your command history is stored locally in your browser only.
Does it support file uploads?
▼
Currently, direct file path uploads from your local disk are not supported in the web version. You can paste file contents as raw data. For multipart/form-data file uploads, use the -F flag with inline data.
Can I use this for internal/local network APIs?
▼
No. Since our runner executes from a cloud environment, it cannot access 'localhost', '127.0.0.1', or private IP addresses within your local network. Use this tool for public endpoints only.
How long is my command history kept?
▼
We store your last 10 commands in your browser's localStorage. They are never sent to our database and remain only on your device until you clear browser data.
Can I test WebSocket endpoints?
▼
No, this tool is for HTTP/HTTPS requests only. WebSocket testing requires persistent connections that cannot be proxied through this interface. Use dedicated WebSocket clients for WSS testing.
Does it support authentication methods?
▼
Yes, all standard HTTP authentication is supported including Bearer tokens (-H 'Authorization: Bearer TOKEN'), Basic auth (-u user:pass), and API keys in headers or query parameters.
Why do I need a proxy for CORS?
▼
Browsers block direct cross-origin requests for security. Our proxy routes your request server-side, avoiding CORS restrictions while still giving you full visibility into request and response details.
Is there a rate limit?
▼
We don't enforce strict rate limits for reasonable usage. However, excessive automated usage may be throttled to ensure service availability for all users. For high-volume testing, consider local cURL.
Understanding cURL Command Runner: A Complete Guide
cURL is the industry-standard command-line tool for testing APIs and making HTTP requests. However, using cURL locally requires terminal access, dealing with CORS restrictions when testing from browsers, and managing different syntax variations across operating systems.
Our Online cURL Runner brings the power of cURL to your browser with an intuitive interface. Test REST APIs, debug webhook endpoints, inspect response headers, and validate authentication—all without leaving your browser. The tool supports all HTTP methods (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS), custom headers, request bodies including JSON and form-data, and various authentication schemes.
Whether you're a frontend developer testing backend endpoints, a QA engineer validating APIs, or learning HTTP fundamentals, this tool provides immediate feedback with formatted JSON responses, response time metrics, and status code information. Requests are routed through a secure proxy to handle CORS, but sensitive data like API keys are never logged or stored.
Key Benefits of Using cURL Command Runner
Technical Specifications
cURL Command Runner vs Competitors
vs Postman
cURL Command Runner Advantages
- ✓No account
- ✓Instant access
- ✓No install
- ✓cURL native
Postman Limitations
- ✗Account required
- ✗Heavy app
- ✗Sync requires paid
- ✗Overkill for simple tests
Pricing Comparison
cURL Command Runner: Free Forever
Postman: Freemium ($12-14/user/mo)
vs ReqBin
cURL Command Runner Advantages
- ✓cURL native
- ✓Free forever
- ✓No limits
- ✓Simple UI
ReqBin Limitations
- ✗Limited requests
- ✗Account for history
- ✗Premium features locked
Pricing Comparison
cURL Command Runner: Free Forever
ReqBin: Freemium ($6/mo)
vs HTTPie
cURL Command Runner Advantages
- ✓Browser-based
- ✓Works everywhere
- ✓No install
- ✓cURL compatible
HTTPie Limitations
- ✗Desktop app only
- ✗Not browser-based
- ✗Terminal required
Pricing Comparison
cURL Command Runner: Free Forever
HTTPie: Free (desktop only)
Troubleshooting Common Issues
Issue: CORS error when testing localhost APIs
Solution: The online runner cannot access localhost or private networks. Use local tools like Postman or terminal cURL for local development testing. This tool is designed for public endpoints.
Issue: API key visible in command history
Solution: Clear your browser's local storage for this site to remove command history. Consider using environment variables in production rather than hardcoding keys in commands.
Issue: Large response not displaying fully
Solution: Responses over 10MB are truncated. For large file downloads or huge JSON responses, use command-line cURL with output redirection: curl -o output.json [URL]
Best Practices for Using cURL Command Runner
Security & Privacy Features
Performance Metrics
Request execution in under 2 seconds
Support for endpoints worldwide
Response parsing for up to 10MB
Command history: 10 entries