{"generatedAt":"2026-07-19T03:01:59.492Z","tool":{"id":"api-header-builder","name":"API Header Builder & cURL Generator","description":"Build HTTP requests visually and generate code for cURL, fetch, axios, and Python with headers, auth, and query params","category":"devtools","icon":"API","keywords":["curl","command","builder","api","header","http","request","fetch","axios","python","rest","generator","online"],"remoteCallable":true,"remoteMode":"dedicated_api","riskClass":"M","maxInputBytes":262144,"timeoutMs":4000,"supportsStreaming":false,"url":"/api-header-builder/","tags":["devtools"],"faqs":[{"question":"What is API Header Builder & cURL Generator?","answer":"API Header Builder & cURL Generator helps you visually construct HTTP requests and generate code for cURL, fetch, axios, and Python. It supports custom headers, authentication, and query parameters."},{"question":"How do I use API Header Builder & cURL Generator?","answer":"Set the HTTP method and URL, add headers, authentication, query parameters, and a request body using the visual form. The tool generates ready-to-use code in cURL, JavaScript fetch, axios, or Python."},{"question":"Is API Header Builder & cURL Generator free?","answer":"Yes. This tool is free to use with immediate access—no account required."},{"question":"Does API Header Builder & cURL Generator store or send my data?","answer":"No. All processing happens entirely in your browser. Your API details and credentials stay on your device — nothing is sent to any server."},{"question":"What code output formats are supported?","answer":"It generates code for cURL (terminal), JavaScript fetch, JavaScript axios, and Python requests. Each output includes the full request configuration with headers, auth, query params, and body."}],"howTo":[{"title":"Select HTTP method","description":"Choose GET, POST, PUT, DELETE, PATCH, or other methods. The method determines what kind of request you're building."},{"title":"Build request headers","description":"Add headers: Content-Type (application/json, application/x-www-form-urlencoded), Authorization (Bearer token, Basic auth), and custom headers your API requires."},{"title":"Add request body (if needed)","description":"For POST/PUT/PATCH, include a JSON body or form data. The tool structures it correctly and validates JSON syntax."},{"title":"Generate cURL command","description":"The tool outputs a ready-to-use cURL command: curl -X POST https://api.example.com/endpoint -H 'Authorization: Bearer token' -d '{...}'. Copy and run in terminal."},{"title":"Convert to code","description":"Some versions generate code snippets in JavaScript (fetch), Python (requests), or Node.js (axios). Paste into your codebase and adapt as needed."}],"agentContract":{"toolId":"api-header-builder","contractVersion":"2.0.0","remote_callable":true,"remote_mode":"dedicated_api","risk_class":"M","max_input_bytes":262144,"timeout_ms":4000,"supports_streaming":false,"preferred_surface":"dedicated_api","dedicated_api":{"baseUrl":"https://aidevhub.io/api/api-header-builder/","openapiUrl":"https://aidevhub.io/api/openapi.yaml","endpoints":[{"method":"GET","path":"/api/api-header-builder/","summary":"GET api-header-builder"},{"method":"POST","path":"/api/api-header-builder/","summary":"POST api-header-builder"}],"riskClass":"M","inputMaxBytes":262144,"timeoutMs":4000},"runtime":{"endpoint":"/api/tools/run/","methods":["GET","POST"],"queryParams":[{"name":"toolId","required":true,"description":"Tool identifier"},{"name":"a","required":true,"description":"Primary input"}],"postBodyShape":{"toolId":"string","input":"{ a, b?, c?, mode? }"},"exampleGet":"https://aidevhub.io/api/tools/run/?toolId=api-header-builder&a=...","policy":{"riskClass":"M","limit":30,"burst":10,"windowSec":60,"inputMaxBytes":262144,"timeoutMs":4000,"cacheTtlSec":0,"networkEnabled":false,"supportsStreaming":false}}},"relatedTools":[{"id":"api-response-mocker","name":"API Response Mocker","url":"/api-response-mocker/","category":"devtools"},{"id":"http-status-codes","name":"HTTP Status Code Reference","url":"/http-status-codes/","category":"devtools"},{"id":"openapi-preview","name":"OpenAPI / Swagger Preview","url":"/openapi-preview/","category":"devtools"},{"id":"webhook-inspector","name":"Webhook Payload Inspector","url":"/webhook-inspector/","category":"devtools"},{"id":"cron-builder","name":"Cron Expression Builder","url":"/cron-builder/","category":"devtools"},{"id":"jsonpath-tester","name":"JSONPath Tester","url":"/jsonpath-tester/","category":"devtools"}]}}