@dotcom-reliability-kit/serialize-request
v3.1.0
Published
A utility function to serialize a request object in a way that's friendly to loggers, view engines, and converting to JSON
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@dotcom-reliability-kit/serialize-request
A utility function to serialize a request object (Express or IncomingMessage) in a way that's friendly to loggers, view engines, and converting to JSON. This module is part of FT.com Reliability Kit.
Usage
Install @dotcom-reliability-kit/serialize-request
as a dependency:
npm install --save @dotcom-reliability-kit/serialize-request
Include in your code:
import serializeRequest from '@dotcom-reliability-kit/serialize-request';
// or
const serializeRequest = require('@dotcom-reliability-kit/serialize-request');
serializeRequest
The serializeRequest
function accepts a request-like object (e.g. an instance of Express.Request
or an object with method
and url
properties) and returns a plain JavaScript object (conforming to the SerializedRequest
type) which contains the relevant properties. The example below assumes that app
is an Express application:
app.get('/fruit/:fruitId', (request, response, next) => {
console.log(serializeRequest(request));
next();
});
// {
// id: 'request137',
// method: 'GET',
// url: '/fruit/feijoa',
// headers: {
// accept: '*/*'
// },
// route: {
// path: '/fruit/:fruitId',
// params: { fruitId: 'feijoa' }
// }
// }
You can also pass in a plain object if you already have one that looks like a request:
serializeRequest({
method: 'get',
url: '/hello'
});
Configuration options
Config options can be passed into the serializeRequest
function as a second argument. It expects an object with any of the keys below.
serializeRequest(request, {
// Config options go here
});
options.includeHeaders
An array of request headers to include in the serialized request object. This must be an Array
of String
s, with each string being a header name. It's important that you do not include headers which include personally-identifiable-information, API keys, or other privileged information.
This option defaults to:
[
'accept',
'accept-encoding',
'accept-language',
'content-type',
'referer',
'user-agent'
]
Example of usage:
serializeRequest(request, {
includeHeaders: [
'accept',
'content-length',
'content-type',
'user-agent'
]
});
The default set of headers is also available to use, so that you don't need to repeat them if you want to add new included headers. It can be accessed as serializeRequest.DEFAULT_INCLUDED_HEADERS
:
serializeRequest(request, {
includeHeaders: [
...serializeRequest.DEFAULT_INCLUDED_HEADERS,
'my-custom-header'
]
});
SerializedRequest
type
The SerializedRequest
type documents the return value of the serializeRequest
function. It will have the following properties, extracting them from a given request object.
SerializedRequest.id
This is extracted from the request.headers['x-request-id']
property and is always cast to a String
. It defaults to null
.
SerializedRequest.method
This is extracted from the request.method
property and is always cast to a String
and switched to uppercase. It defaults to "-"
.
SerializedRequest.url
This is extracted from the request.url
property and is always cast to a String
. It defaults to "/"
.
SerializedRequest.headers
This is extracted from the request.headers
property and is filtered to only include the headers specified in the includeHeaders
option. It defaults to an empty object.
SerializedRequest.route
This is an object extracted from request.route.path
(string) and request.params
(object) if they are present and conform to the same properties on an Express Request object. It defaults to undefined
.
Migrating
Consult the Migration Guide if you're trying to migrate to a later major version of this package.
Contributing
See the central contributing guide for Reliability Kit.
License
Licensed under the MIT license. Copyright © 2022, The Financial Times Ltd.