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network-error-logging

v1.2.1

Published

NEL Middleware for Express

Downloads

1,449

Readme

Network Error Logging

npm version dependencies Status Actions Status Coverage Status FOSSA Status

This is Express middleware to set the NEL HTTP response header. You can read more about it here.

To use:

const NEL = require('network-error-logging')

// ...

app.use(NEL({
	report_to: 'endpoint-1', // REQUIRED to register. OPTIONAL if intention is to remove a previous registration. defined in the Report-To header
	max_age: 31536000, // REQUIRED. seconds
	include_subdomains: true, // OPTIONAL
	success_fraction: 0.5, // OPTIONAL. sampling rate
	failure_fraction: 0.5, // OPTIONAL. sampling rate
	request_headers: ["If-None-Match"], // OPTIONAL. request headers whose names and values are included in the network error reports
	response_headers: ["ETag"] // OPTIONAL. response headers whose names and values are included in the network error reports
}))

For further documentation on each field, see https://w3c.github.io/network-error-logging/#nel-response-header.

This header is best set with a previously defined Report-To group. This module is a great way to do that.

https://report-uri.com/ is a great reporting platform for monitoring CSP, NEL, etc. error logs.

License

FOSSA Status