HTTP Header Parser
Parse raw HTTP header lines, normalize names, and inspect invalid lines quickly.
Limits: up to 64 KB and 2000 lines
{
"host": [
"example.com"
],
"accept": [
"application/json",
"text/plain"
],
"x-trace-id": [
"demo-123"
]
}host: example.com accept: application/json, text/plain x-trace-id: demo-123
| Line | Header Name | Value |
|---|---|---|
| 1 | Host | example.com |
| 2 | Accept | application/json |
| 3 | X-Trace-Id | demo-123 |
| 4 | Accept | text/plain |
- acceptx2
No invalid lines were found.
What
HTTP Header Parser definition
HTTP headers are metadata lines in the form of key-value pairs (for example, Content-Type: application/json). This parser helps you validate header formatting and produce normalized output for debugging.
Cases
Use Cases
Validate copied request/response headers before reproducing API calls
Detect malformed header lines that break gateway routing
Normalize duplicated headers for documentation and test fixtures
Review security-sensitive headers like Authorization and Cookie
Prepare clean header blocks for cURL or fetch snippets
Spot line-level parsing errors during incident analysis
How To
How to Parse HTTP Headers
Paste header lines, run parse, and review normalized output, duplicates, and invalid lines.
Paste header lines
Enter raw lines in Key: Value format. Empty lines are ignored.
Run parser
Click Parse to validate names, split fields, and aggregate repeated headers.
Review and copy
Inspect JSON and normalized headers, then copy the output you need.
Knowledge
Header Parsing Knowledge
FAQ