cURL Builder

Generate and copy curl commands to test your API endpoints. Create complex requests with custom headers, multiple data formats, and advanced options.

cURL Builder

Build and test HTTP requests visually

Method
GET
Headers
0
Params
0
Options
0

Request Configuration

Headers

Authentication

Query Parameters

Generated cURL Command

All processing happens locally in your browser. No data is sent to any server.

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