cURL Command Builder

Build readable cURL commands for API requests with method, headers, JSON body and safe auth placeholders.

cURL command 

        

    

                

            
                    

                        
How to use this tool

                        
    
                                                            
  1. Enter the request URL and method.
    2. 
                                                            
  2. Add one header per line and an optional JSON body.
    3. 
                                                            
  3. Generate a copy-paste ready cURL command.
    4. 
                                                            
  4. Replace placeholder secrets in your terminal, not in shared docs.
    5. 
                                                    

                    


                    

                        
Common mistakes

                        
    
                                                            
  • Putting real API keys into shared screenshots or docs.
    • 
                                                            
  • Forgetting Content-Type: application/json for JSON bodies.
    • 
                                                            
  • Using GET with a request body when the API expects query parameters.
    • 
                                                    

                    


                    

                        
FAQ

                        

                                                            

                                    Does this send the request?
                                    
No. It only builds a cURL command.

                                

                                                            

                                    Can I add auth headers?
                                    
Yes, add Authorization: Bearer YOUR_TOKEN as a placeholder and replace it locally.

                                

                                                            

                                    Does it validate JSON body syntax?
                                    
It warns when JSON looks invalid. Use the JSON Validator for detailed formatting.

                                

                                                    

                    


                        

        
Related tools

        

                                                
                        JSON
                        JSON Validator and Formatter
                        
Validate JSON, format it for reading, or minify it for compact API payloads without sending data to an external API.

                    
                                                                
                        OpenAI
                        OpenAI API Request Checker
                        
Statically inspect an OpenAI API request body for common JSON and parameter mistakes before sending it to the API.

                    
                                                                
                        HTTP
                        HTTP Headers Checker
                        
Analyze pasted HTTP response headers for cache, redirects, security headers and content-type issues without making server-side requests.

                    
                                    

    

                            

        
Related guides and fixes

        

                                                
                        cURL
                        cURL API Debugging Workflow for Developers
                        
cURL is the simplest way to separate API behavior from SDK, framework or frontend code. Build a minimal request first, then compare it with the failing implementation.

                    
                                                                
                        OpenAI
                        Debug OpenAI API Request JSON Before Sending
                        
Most API request bugs are easier to fix before the request is sent. Start with valid JSON, then check model-family parameters and only then debug application code.

                    
                                                                            
                        HTTP
                        HTTP 403 vs 401 Fix
                        
401 and 403 are both access failures, but they point to different checks. Debug the auth header, user permissions and proxy rules separately.

                    
                                                                
                        JSON
                        JSON Trailing Comma Error Fix
                        
JSON is stricter than JavaScript object literals. Trailing commas, comments and single-quoted strings can break API requests and config files.

                    
                                    

    

                        
Last updated: May 17, 2026