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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["express-middleware","npm-package"],"created_at":"2026-03-03T15:04:48.808Z","updated_at":"2026-03-03T15:04:52.013Z","avatar_url":"https://github.com/jochen-schweizer.png","language":"JavaScript","funding_links":[],"categories":[],"sub_categories":[],"readme":"[![build status](https://travis-ci.org/jochen-schweizer/microservice-chain-logger.png)](https://travis-ci.org/jochen-schweizer/microservice-chain-logger) [![Coverage Status](https://coveralls.io/repos/github/jochen-schweizer/microservice-chain-logger/badge.svg?branch=master)](https://coveralls.io/github/jochen-schweizer/microservice-chain-logger?branch=master) [![license](https://img.shields.io/github/license/mashape/apistatus.svg?maxAge=2592000)](https://www.tldrlegal.com/l/mit) [![NPM version](https://badge.fury.io/js/microservice-chain-logger.png)](http://badge.fury.io/js/microservice-chain-logger)\n\n# microservice chain logger\n\nText or JSON-formatted logger for microservices\nwith bundled Correlation ID and http-server access logging.\n\nFeatures:\n\n* wrappers for `console.info/warn/error` producing a text or JSON inflated with customizable metadata\n* access log express middleware with additional metadata provided with the same API\n* reading/assigning `X-Correlation-ID` which is automatically reflected in the log messages (including access logs)\n\nAll of the features are optional and you can use only the ones you need.\n\n## Install\n\n```\nnpm install microservice-chain-logger\n```\n\n## Basic example\n\n```javascript\nconst logger = require('microservice-chain-logger');\nconst app = require('express')();\n\n// this initiates firing logger.info on each request\n// with basic access log information: user, status code, method, path\napp.use(logger.initAccessLog({\n  // this (optional) setting tells that access log\n  // and ALL OTHER LOGS should use JSON format\n  useJsonTransformer: true\n}));\n\napp.get('/', (req, res) =\u003e {\n  // here we use req as the first parameter\n  // making it possible to recognize X-Correlation-ID\n  // The object req itself will NOT be logged\n  logger.info(req, 'root called with headers', req.headers);\n  res.send('Hello World');\n});\n\n// sample express error handler\napp.use((err, req, res, next) =\u003e {\n  // Here we log a potential exception object (err).\n  // It will be automatically recognized as an exception,\n  // creating stack, file, line and column fields\n  // in the resulting JSON\n  logger.error(req, 'there was an error:', err);\n  next();\n});\n\napp.listen(3000);\n\n// just a normal log, no req needed here,\n// since it's not in a HTTP-Request context\nlogger.info('call: curl http://localhost:3000/');\n```\nPlease note that the **logger** is a singleton meaning\nany changes you make to it by replacing a function would\nhave immediate effect on the entire application.\n\n## API\n\n### logger.info(), logger.warn(), logger.error(), logger.debug()\n\nThese functions correspond to `console` but also add metadata,\ne.g. `processTime`, `correlationId` and any other data you inject\nusing `transformEntry`.\n\nThe first parameter has a special meaning. If it's an instance\nof **express Request**, then it's not logged but used as a context,\ne.g. as a source for `correlationId`\n\n```javascript\napp.get('/some/route', (req, res) =\u003e {\n  logger.info('just some text');\n  logger.warn('you', {can: 'mix'}, 'different', ['types', 1337]);\n  logger.info(req, 'message with meta data', {from: 'the req'});\n});\n```\n\nNote: **logger.debug()** uses the same **console.info()** just like **logger.info()**\n\n### logger.infoSource()\n\nSame as **logger.info()** but adds **file**, **line** and **column** fields referencing\nthe code location where it was called\n\n```javascript\n// outputs \"reached this point! in my_file.js:10:2\"\nlogger.infoSource('reached this point!');\n```\n\n### logger.initAccessLog(opts)\n\n* **opts** - `Object` or `undefined`\n\nThe access log can be used as a replacement for the `morgan` module,\nkeeping all of the logs in a consistent format and implicitly providing `correlationId` for each request.\n\nThe request duration is automatically measured and stored\nin the **duration** field.\n\n```javascript\n// access log will not be triggered for /status\n// because it comes BEFORE acess log middleware\napp.get('/status', (req, res) =\u003e res.send('healthy'));\n\n// register access log middleware\napp.use(logger.initAccessLog());\n\napp.get('/', (req, res) =\u003e {\n  res.send('requests to this and further routes will be logged');\n});\n```\n\nOptions:\n  * **useJsonTransformer** - replace default **textTransformer** with **jsonTransformer** function\n  * **maxMessageLength** - override default `maxMessageLength=8000` for **jsonTransformer**\n  * **injectIntoReq** - automatically create **req.logger** bound to the request\n  * **assignCorrelationId** - automatically assign a new **correlationId**, if none was provided in headers\n\n```javascript\n// init access log and replace transformEntry\n// so that it produces JSON when in production environment\napp.use(logger.initAccessLog({\n  useJsonTransformer: process.env.NODE_ENV === 'production',\n  assignCorrelationId: true\n}));\n```\n\nThe access log middleware adds a field `isAccessLog` to the log\nentry, which is then removed in the default `transformEntry`.\nYou can use this flag for special logic for messages coming from access log.\n\n### logger.getCorrelationId(req)\n\nReturns the value of `X-Correlation-ID` if provided in the header,\notherwise creates a new one using UUID v4.\n\n```javascript\napp.get('/', (req, res) =\u003e {\n  res.send('correlationId is ' + logger.getCorrelationId(req));\n});\n```\n\nNote `getCorrelationId()` also sets `X-Correlation-ID` header to current req,\nthus if called twice it will return the same ID, and if called at least\nonce then the access log will already contain the correlation ID.\n\n### logger.assignCorrelationId(req, opts)\n\nAssigns `correlationId` to `request`-compatible `opts`-object.\nIt uses `getCorrelationId()` internally meaning it has the same\nside effect on current req.\n\n```javascript\nconst request = require('request');\napp.get('/', (req, res, next) =\u003e {\n  request(logger.assignCorrelationid(req, {\n    uri: 'http://some.other.service/and/path'\n  }))\n    .then(() =\u003e {\n      res.send('correlationId is ' + logger.getCorrelationId(req));\n    })\n    .catch(next);\n});\n```\n\nAn alternative way when using `superagent`:\n\n```javascript\nconst superagent = require('superagent');\napp.get('/', (req, res, next) =\u003e {\n  superagent\n    .get('http://some.other.service/and/path')\n    .set('X-Correlation-ID', logger.getCorrelationId(req))\n    .end(function(err, res){\n      // Do something\n    });\n});\n```\n\n## Hacking API\n\nFor the most of the cases you should be fine with the functions above,\nbut feel free to hack the library at your on risk.\n\n### logger.logFunctions property\n\n**logger.logFunctions** is an object consisting of `{info, warn, error, debug}`\n\nThese functions can be used to override default core logging functions\n(default core logging functions are `console.info`,\n`console.debug`, `console.warn` and `console.error`).\n\nYou can either replace single functions, e.g.;\n\n```js\nlogger.logFunctions.error = (error) =\u003e { /* ... send email ... */ };\n```\n\n... or replace the entire **logger.logFunctions** object.\n\n[see an example](https://github.com/jochen-schweizer/microservice-chain-logger/blob/master/examples/change-log-functions.js)\n\n### logger.transformEntry(func, entry)\n\nParams:\n\n* **func** - console logging function such as `console.info/warn/error`\n* **entry** - the object containing the message and metadata to be logged\n\nReturns `String` or `undefined`.\n\nReturning `undefined` skips the current message.\n\nReplacing this function allows customizing the log format\nand log filtering. By default a text transformer is used (**logger.textTransformer**).\nThe text transformer supports displaying the following fields:\n\n * processTime\n * message\n * stack\n * file, line, column\n * duration\n\n```javascript\n// switch to JSON transformer instead\nlogger.transformEntry = logger.jsonTransformer;\n\n// custom text transformer\nlogger.transformEntry = (func, entry) =\u003e {\n  // suppress info logging, but keep access logs\n  if (!entry.isAccessLog \u0026\u0026 func === console.info) {\n    return;\n  }\n\n  // output logs as text instead of JSON\n  return entry.processTime + ' ' + entry.message;\n};\n```\n\n### logger.makeEntry(req, ...messages)\nParams:\n\n* **req** - **express Request** or `null`\n* **...messages** - mixed\n\nReturns `Object`.\n\nReplacing this function allows you to alter metadata injection,\non the step BEFORE `transformEntry`, e.g. if you want to inject\nsomething from `req` other than just `correlationId`\n\n```javascript\n// extend makeEntry(), so that each record also includes HTTP method\nconst origianlMakeEntry = logger.makeEntry;\nlogger.makeEntry = (req, ...messages) =\u003e {\n  const result = origianlMakeEntry(req, ...messages);\n  if (req) {\n    result.method = req.method;\n  }\n  return result;\n};\n```\n\n### logger.applyLogFunction(func, entry)\nParams:\n\n* **func** - one of the loging functions: `console.info`, `console.warn` or `console.error`\n* **entry** - message **object**\n\nThe unferlying function for `logger.info/warn/error`\nworking with the logging object instead of trying to format mixed parameters\nas a single message string. It will **NOT** call `makeEntry`, so if you need\nthe context just call `makeEntry` explicitly to prepare the initial **entry**.\n\nYou can use it to inject specific custom fields directly from your code.\nMost likely you want to set at least **message** and **processTime**\nproperties to keep it consistent with the rest of the library.\n\n```javascript\nlogger.applyLogFunction(console.info, {\n  message: \"balloon started\",\n  color: \"blue\",\n  size: \"medium\",\n  processTime: (new Date()).toISOString()\n});\n```\n... and yes, you can replace it to match you needs just like other functions above\n\n## Using together with kraken.js\n\nHere is a sample of how you can replace the standard **morgan** access log just by changing the config:\n\n```json\n{\n  \"middleware\": {\n    \"logger\": {\n      \"route\": \"/((?!metrics|status|favicon.ico|robots.txt))*\",\n      \"priority\": 0,\n      \"module\": {\n        \"name\": \"microservice-chain-logger\",\n        \"method\": \"initAccessLog\",\n        \"arguments\": [\n          {\n            \"useJsonTransformer\": true\n          }\n        ]\n      }\n    }\n  }\n}\n```\n... you may want to move the `arguments` part to `production.json`,\nso that you get JSON in production environment only.\n\n### More examles\n\n[...See more advanced examples on github](https://github.com/jochen-schweizer/microservice-chain-logger/tree/master/examples)\n\n## License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjochen-schweizer%2Fmicroservice-chain-logger","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjochen-schweizer%2Fmicroservice-chain-logger","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjochen-schweizer%2Fmicroservice-chain-logger/lists"}