API Header Builder
Build HTTP headers with templates for Authorization, CORS, and caching
Build Custom Headers
Add and remove key-value pairs to build your HTTP headers
Headers JSON
Copy headers as a JSON object
{
"Content-Type": "application/json"
}Generate Code with Headers
Generate HTTP request code snippets using your headers
About API Header Builder
The API Header Builder helps you construct HTTP request headers for API testing and integration. Build custom headers from scratch, load common templates for different API patterns, or generate authentication headers with proper encoding.
This tool supports popular authentication methods including Bearer tokens, Basic authentication (with automatic Base64 encoding), API keys (header or query parameter), and OAuth 2.0. Once you've built your headers, generate ready-to-use code snippets in cURL, JavaScript (fetch), Node.js (axios), or Python (requests).
Perfect for API developers, QA engineers, and anyone working with HTTP APIs. All processing happens in your browser - your credentials and tokens are never sent to any server. Test your API requests with these headers using HooksDash's webhook endpoints.
Need webhook testing?
HooksDash provides instant webhook endpoints, request inspection, and local forwarding. Perfect for testing the requests you build here.