HTTP headers to JSON converter

How to use it

1. Enter headers and lowercase header names.
2. The result appears straight away and updates as you edit.
3. Copy the result, or copy a link that keeps the same values to share it.

How it is calculated

Each line is split at the first : into name and value, and spaces around the value are trimmed. A start line such as GET /path HTTP/1.1 or HTTP/1.1 200 OK is set aside, a line starting with a space continues the previous value, and parsing stops at the first blank line. Names are compared case-insensitively.

Example

Inputs: Lowercase header names = no. Result: JSON: { "Host": "shop.example.com", "Accept": "application/json", "Accept-Language": "ar-SA,ar;q=0.9,en;q=0.8", "Cookie": "session_id=abc123", "Cache-Control": "no-cache" }; Header lines: 5; Start line: GET /api/orders?page=2 HTTP/1.1.

GET /api/orders?page=2 HTTP/1.1
Host: shop.example.com
Accept: application/json
Accept-Language: ar-SA,ar;q=0.9,en;q=0.8
Cookie: session_id=abc123
Cache-Control: no-cache

{
  "Host": "shop.example.com",
  "Accept": "application/json",
  "Accept-Language": "ar-SA,ar;q=0.9,en;q=0.8",
  "Cookie": "session_id=abc123",
  "Cache-Control": "no-cache"
}

Limits and caveats

• Repeated headers are kept as an array rather than joined with commas, since joining breaks Set-Cookie.
• Any message body after the blank line is ignored.