express-elasticsearch-logger

express-elasticsearch-logger

Log Express app requests to ElasticSearch.

Installation

Install using npm:

npm install express-elasticsearch-logger

API Reference

express-elasticsearch-logger

• express-elasticsearch-logger
  • .doc : Object
  • .requestHandler(config, [client]) ⇒ elasticsearchLoggerMiddleware
  • .errorHandler(err, req, res, next)
  • .skipLog(req, res, next)

express-elasticsearch-logger.doc : Object

Document indexed with ElasticSearch. request and response properties are included if they are whitelisted by config.whitelist.

Kind: static constant of express-elasticsearch-logger
Properties

Name	Type	Description
env	String	defaults to "development"
[error]	Error	error object passed to next()
duration	Number	milliseconds between request and response
request	Object	requst object detail of express
request.httpVersion	String
request.headers	Object
request.method	String
request.originalUrl	String
request.route.path	String
request.path	String
request.query	Object
response	Object
response.statusCode	Number
os	Object
os.totalmem	Number	OS total memory in bytes
os.freemem	Number	OS free memory in bytes
os.loadavg	Array.<Number>	Array of 5, 10, and 15 min averages
process	Object
process.memoryUsage	Number	process memory in bytes
@timestamp	String	ISO time of request

express-elasticsearch-logger.requestHandler(config, [client]) ⇒ elasticsearchLoggerMiddleware

Returns Express middleware configured according to given options.

Middleware must be mounted before all other middleware to ensure accurate capture of requests. The error handler must be mounted before other error handler middleware.

Kind: static method of express-elasticsearch-logger
Returns: elasticsearchLoggerMiddleware - express middleware

Param	Type	Default	Description
config	Object		elasticsearch configuration
[config.host]	String	"http://localhost:9200"	elasticsearch host to connect
[config.index]	String	"log_[YYYY]-h[1|2]"	elasticsearch index (default: log_YYYY-h1 or log_YYYY-h2 as bi-annually)
config.whitelist	Object
[config.whitelist.request]	Array.<String>	["userId","body","email","httpVersion","headers","method","originalUrl","path","query"]	request properties to log
[config.whitelist.response]	Array.<String>	["statusCode", "sent", "took"]	response properties to log
[config.censor]	Array.<String>	["password"]	list of request body properties to censor
[config.includeDefault]	Boolean	true	include default whitelist and censor the the given config
[config.indexPrefix]	String	"log"	elasticsearch index prefix for running index
[config.indexSuffixBy]	String	"halfYear"	elasticsearch index suffix for running index, one of m M month (Monthly) q Q quarter (Quarterly) h H halfYear (Bi-annually)
[config.indexSettings]	Object	{ index: { number_of_shards: "3", number_of_replicas: "2", refresh_interval: "60s", analysis: { normalizer: { lowercase: { type: "custom", char_filter: [], filter: ["lowercase"], }, }, }, }, }	settings in the mapping to be created
[client]	elasticsearch.Client		@elastic/elasticsearch client to be injected

Example

const express = require('express');
const logger = require('express-elasticsearch-logger');

const app = express();

app
  .use(logger.requestHandler({
    host: 'http://localhost:9200'
  })
  .get('/', function (req, res, next) {
    res.sendStatus(204);
  })
  .use(logger.errorHandler);

• .requestHandler(config, [client]) ⇒ elasticsearchLoggerMiddleware

express-elasticsearch-logger.errorHandler(err, req, res, next)

Error handler middleware exposes error to Response#end

This middleware is used in combination with requestHandler to capture request errors.

Kind: static method of express-elasticsearch-logger

Param	Type
err	Error
req	express.Request
res	express.Response
next	express.Request.next

express-elasticsearch-logger.skipLog(req, res, next)

This middleware will mark for skip log use this middleware for endpoint that is called too often and did not need to log like healthcheck

Kind: static method of express-elasticsearch-logger

Param	Type
req	express.Request
res	express.Response
next	express.Request.next

Contributing

Please submit all issues and pull requests to the alexmingoia/express-elasticsearch-logger repository!

Tests

Run tests using npm test.

Support

If you have any problem or suggestion please open an issue here.