cURL Builder
Generate and copy curl commands to test your API endpoints. Create complex requests with custom headers, multiple data formats, and advanced options.
All commands are generated client-side. Your API details never leave your browser and no actual requests are made from our servers.
The URL to send the request to.
Specify the request method to use.
Parameters will be added to the URL as a query string.
Generated cURL Command
Please enter a valid URL to generate the cURL command.
cURL Fundamentals
What is cURL?
cURL (Client URL) is a command-line tool for transferring data with URLs. It supports:
- Multiple protocols (HTTP, HTTPS, FTP, etc.)
- Custom HTTP methods and headers
- Request body data transmission
- Authentication and cookies
Common Use Cases
- Testing REST APIs and web services
- Downloading files from servers
- Debugging HTTP requests
- Automating web interactions
- Checking server responses
Working with JSON Requests
- Set Content-Type header to
application/json
- Format your JSON data properly with correct syntax
- Use single quotes around the JSON data in your cURL command
- Escape quotes and special characters in your JSON payload
Form Data Submissions
- Use
application/x-www-form-urlencoded
for simple forms - Use
multipart/form-data
when uploading files - URL-encode parameter values to handle special characters
- Use the
-F
option for file uploads in multipart forms
Key cURL Options
-X
: Specify HTTP method (GET, POST, etc.)-H
: Add custom headers-d
: Send data in the request body-i
: Include response headers-L
: Follow redirects-v
: Verbose output for debugging-k
: Allow insecure connections (self-signed certificates)
Best Practices
- Always quote URLs to handle special characters
- Use appropriate content-type headers for your data
- Properly encode request data
- Consider security when sharing commands (hide sensitive tokens)
- Test commands in a safe environment first
- Add the
-v
flag for troubleshooting when requests fail