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.