cURL Builder
Build cURL commands visually — method, headers, auth, body, and options
curl \ https://api.example.com/endpoint \ -H 'Content-Type: application/json'
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Quick Start Guide
Build your first cURL command
Quick Start Guide
- 1
Choose Method & URL
Select an HTTP method (GET, POST, PUT, etc.) and enter your API endpoint URL. Or pick a preset to get started quickly.
- 2
Add Headers & Auth
Add custom headers (Content-Type, Accept, etc.) and configure authentication — Bearer token, Basic auth, or API key.
- 3
Set Request Body
For POST/PUT/PATCH requests, choose JSON, form data, or raw body and enter your payload.
- 4
Copy & Run
The cURL command updates in real-time. Click Copy and paste it into your terminal.
What is cURL?
The universal HTTP client
cURL (Client URL) is the most widely used command-line tool for transferring data via URLs. Available on virtually every operating system, it supports HTTP, HTTPS, FTP, and dozens of other protocols.
Why Use a cURL Builder?
Writing cURL commands by hand is error-prone — escaping quotes, remembering flag names, formatting JSON bodies. A visual builder eliminates syntax errors and lets you focus on the request itself.
Common cURL Flags
- -X: HTTP method (GET, POST, PUT, DELETE)
- -H: Add a header (repeatable)
- -d: Request body data
- -u: Basic auth (user:password)
- -L: Follow redirects
- -k: Skip SSL verification
- -v: Verbose output
- -s: Silent mode (no progress bar)
- --compressed: Request compressed response
From Browser to Terminal
Most browser DevTools let you "Copy as cURL" from the Network tab. This tool does the reverse: build the command visually and copy it to your clipboard.
Common Use Cases
When you need cURL
API Development & Testing
Build and test REST API calls during development. Set headers, auth tokens, and JSON bodies without memorizing cURL syntax.
Debugging Webhooks
Construct webhook payloads to test integrations. Set custom headers, signatures, and body content for services like Stripe, GitHub, or Slack.
Documentation & Sharing
Generate clean, properly-escaped cURL commands for API documentation. Share exact commands that colleagues can copy and run.
CI/CD Pipeline Scripts
Build cURL commands for deployment scripts, health checks, and API calls in CI pipelines. Get the escaping right the first time.
How to Use cURL Builder
Step-by-step
Build your cURL command step by step with the visual interface.
Method & URL
Select the HTTP method from the dropdown and enter the full URL. Query parameters can be added separately — they'll be URL-encoded and appended automatically.
Headers
Click "Add" to add headers. Each header has a checkbox to quickly enable/disable without deleting. Common headers: Content-Type, Accept, Authorization, X-API-Key.
Authentication
Four auth types are supported:
- None: No auth headers
- Bearer Token: Adds Authorization: Bearer {token}
- Basic Auth: Uses -u user:password (base64 encoded by cURL)
- API Key: Custom header name + value
Request Body
Available for POST, PUT, PATCH methods:
- JSON: Sends application/json body
- Form Data: URL-encoded key=value pairs
- Raw: Any content (XML, text, binary reference)
Options
Toggle common cURL flags: follow redirects (-L), skip SSL (-k), verbose (-v), silent (-s), compressed, and connection timeout.
Frequently Asked Questions
cURL builder explained
Frequently Asked Questions
Security & Privacy
Your data stays local
API requests often contain sensitive data — auth tokens, API keys, passwords, and proprietary payloads. This tool is designed for that reality.
- 100% client-side: No server processing. Zero network requests with your data.
- No storage: Nothing is saved, cached, or persisted. Close the tab to clear everything.
- No telemetry on content: We track page views but never inspect or log your URLs, headers, tokens, or body content.
- Offline capable: After loading, works without an internet connection.
- Transparent & auditable: Verify the code yourself in browser DevTools.
Safe for building commands with production API keys, OAuth tokens, and sensitive payloads.