May 29, 2022

What is it?

It is an extendable isomorphic log sending library written in TypeScript for javascript application in nodejs and browsers.

It can be extended with custom strategy (“when to send logs”) and service (“where to send logs”).

It does not restrict you with conventions, for example, existence of “logSeverity”, “ErrorId” or “message” fields in log.

It supports any format of logs via custom serializer.


  • It works in browsers and nodejs
  • It is able to send single logs and bundles of them to an external logger
  • It supports different log sending strategies:
    1. interval (for example, every 10 seconds)
    2. :on request (only when you ask)
    3. mixed (“interval” + “on request”) (will be done soon)
    4. on bundle size (for example, sends bundles of 100 logs)
    5. instant (received 1 log -> sent 1 log)
  • It is able to group duplicated logs in certain time interval (for rapid fire of the same logs)
  • It is not afraid of circular links in log objects
  • It supports custom format for logs (custom serializer)
  • It supports different remote logger endpoints (SumoLogic, Loggly and Elasticsearch). Who is the next? ᕙ(ಠ.ಠ)ᕗ

Runtime environment support

Builds are generated as ES2015 bundles for nodejs and browser environments.

NodeJS - tested on latest lts

Browser - all latest browsers, that support ES2015 JS.


NPM package link

GitHub link

Feature branch build npm version install size

Quality checks Quality Gate Status Bugs Code Smells Coverage Duplicated Lines (%) Lines of Code Maintainability Rating Reliability Rating Security Rating Technical Debt Vulnerabilities

Conventional Commits

FOSSA Status