Request Header Builder
Build HTTP request headers, add common API headers, format header blocks, and copy clean header output directly in your browser.
Header Rows
Add request headers as normal name and value pairs.
Common Headers
Add common headers quickly, then edit the values if needed.
Auth Header
Output Options
Header notes
No Content-Type header
If your request has a body, add a Content-Type header so the server knows how to read it.
No Accept header
Some APIs respond differently when an Accept header is missing.
Header Output
Header output will appear here.
Building HTTP Request Headers for API Testing
Request headers tell an API what kind of response you want, how the request body is formatted, how authentication should work, and how a client identifies itself. They are easy to mistype when you are building requests by hand.
This Request Header Builder helps you create clean header blocks for API testing, cURL commands, fetch snippets, support notes, and documentation. Add common headers, choose an auth header, hide sensitive values, and copy the output in the format you need.
Creating Headers Without Rewriting the Same Lines
- Add header names and values in the rows above.
- Use common header buttons for Accept, Content-Type, and more.
- Add Bearer, Basic, or API key auth when needed.
- Choose header block, JSON, cURL, or fetch output.
- Copy the output and review sensitive values before sharing.
Common Request Header Builder Use Cases
- Building headers for API debugging and endpoint testing.
- Preparing Authorization and Content-Type headers quickly.
- Creating cURL header flags from normal key-value rows.
- Writing fetch headers for JavaScript examples.
- Replacing real API keys and tokens before sharing snippets.
- Documenting request headers in support notes or API docs.
Example Headers
Accept: application/json Content-Type: application/json Authorization: Bearer YOUR_TOKEN X-Request-ID: req_12345
Be Careful With Auth and Cookie Headers
Headers often contain tokens, API keys, cookies, session IDs, and other values that should not be shared publicly. The tool hides sensitive-looking values by default in copied output.
Before pasting headers into a ticket, chat message, or documentation, replace real secrets with safe placeholder values.
Frequently Asked Questions
What is a request header builder?
It helps you create HTTP request headers from key-value rows and copy them as a header block, JSON object, cURL flags, or fetch headers.
Can I build Authorization headers?
Yes. You can create Bearer token, Basic auth, or API key headers from the auth section.
Can this generate cURL headers?
Yes. Choose cURL headers output to get -H lines that can be used in a cURL command.
Why are some values hidden?
Authorization, Cookie, API key, and token-like headers can contain secrets. They are hidden by default so copied output is safer to share.
Are my headers uploaded anywhere?
No. Header building happens directly in your browser, and your header values are not uploaded to a server.