domain_list
Lists all unique domains found in a HAR file to help reduce output volume and provide filtering options.
LABSCO SUMMARY
A HAR file reduced to lines you can scan, with the detail one hash away.
The design is about output volume. A raw HAR is unreadable and enormous; this returns one line per request, and only the entries you name come back with headers and bodies. Listing the domains first is the intended move — it shows you what to exclude before the request list is worth reading.
What it is
A reader for HAR files on your disk. It flattens a capture into one line per request with a short hash, and those hashes are how you ask for the full detail later.
What you get
- Every request as a compact line — hash, status, method, URL — with query parameters shown or hidden
- Filtering by status code, HTTP method, URL pattern, or by excluding domains you do not care about
- Full headers and request and response bodies for specific entries, addressed by hash, one at a time or several at once
- A list of every unique domain in the capture, which is how you find the noise worth filtering out
Requirements
No account and no key — it reads a .har file from a path you give it. Run it with npx -y @naotaka/mcp-har-server@latest over stdio, or from a build with node build/index.js. The package also installs mcp-har-cli for the command line and mcp-har-sse for an SSE transport.
Setup effort
One command — npx -y @naotaka/mcp-har-server@latest
USE CASES
01
Finding which request broke a page load
Filter the capture to the failing status codes, then open those entries' headers and bodies.
02
Cutting third-party noise out of a capture
List the domains present, then re-run the request list excluding the ones that are not yours.
03
Checking what a form actually posted
Filter to the POST requests, then read the request body of the one you care about.
04
Comparing what two API calls sent and received
Pass both hashes in one call and read their headers and bodies side by side.
3 tools
Counted once with only startup setup. Other versions, modes or optional credentials may expose a different list.
har_detail
Provides detailed information about specific HAR file entries including headers and request/response bodies.
har_viewer
Displays HAR file requests in a simplified format with options to filter by method, status code, or URL pattern and toggle query parameter visibility.
BEFORE YOU INSTALL
What to know first
Tools you get
3 tools when we connected.
Requires
npx on PATH
CONTEXT COST
Light Standing cost
Rated by the size of the 3 tool definitions that ride along on every turn, not by how many there are
INSTALLATION
Connect your client
Add the block to your client, or run the command directly.
Server setup
Configuration file
JSON
{
"mcpServers": {
"mcp-har-server": {
"command": "npx",
"args": [
"-y",
"@naotaka/mcp-har-server@latest"
]
}
}
}npx
TERMINAL
npx -y @naotaka/mcp-har-server@latest
