HTTP Headers Parser & Builder

About the HTTP Headers Parser & Builder

Paste a raw block of HTTP headers, such as one copied from browser developer tools or curl -i, and see it as a table of names and values. Switch to Build to write a header block from name-value pairs. No HTTP request is ever sent.

Lines that are not valid headers are skipped with a warning that names the line, so one bad line does not hide the rest.

How to use it

1. Choose Parse to read a header block, or Build to create one.
2. Paste raw headers such as Content-Type: application/json, one per line, or press Sample.
3. Read the table and any warnings about skipped lines, then Copy Output.

Worked example

Parse mode shows one row per header.

Content-Type: application/json
Cache-Control: no-store
Authorization: Bearer abc

Content-Type  application/json
Cache-Control  no-store
Authorization  Bearer abc

Common mistakes and gotchas

• Header names are case-insensitive but the tool shows them as written, so content-type and Content-Type are the same header to a server.
• The same header may appear several times (Set-Cookie often does). Each occurrence is kept as its own row.
• A line that begins with a space or tab continues the previous header value and is joined to it.
• Header blocks often contain cookies and credentials. They are not sent anywhere by this tool, but avoid pasting live secrets on a shared screen.

Frequently asked questions