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Grafana Loki transport for the nodejs logging library Winston.
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Bump mixin-deep from 1.3.1 to 1.3.2
Latest commit 37dfeb6 Aug 28, 2019


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A Grafana Loki transport for the nodejs logging library Winston.

NOTE: Latest version only guaranteed to work with the latest version of Grafana Loki. Make sure to update Loki if you have updated this package


This Winston transport is used similarly to other Winston transports. Require winston and define a new LokiTransport() inside its options when creating it.


LokiTransport() takes a Javascript object as an input. These are the options that are available, required in bold:

Parameter Description Example Default
host URL for Grafana Loki http://localhost:3100 null
interval The interval at which batched logs are sent in seconds 30 5
json Use JSON instead of Protobuf for transport true false
batching If batching is not used, the logs are sent as they come true true
clearOnError Discard any logs that result in an error during transport true false
replaceTimestamp Replace any log timestamps with true false


const { createLogger, transports } = require("winston");
const LokiTransport = require("winston-loki");
const options = {
  transports: [
    new LokiTransport({
      host: "http://localhost:3100"
const logger = createLogger(options);


npm install
npm link
cd ~/your_project
npm link winston-loki
npm install

And you should have a working, requirable winston-loki package under your project's node_modules.

Refer to for documentation about the available endpoints, data formats etc.

Grafana Loki doesn't have any official releases or version numbers as of now, so if the API is changed, it's going to be fun, but it's working as of now.

Run tests

npm test

Write new ones under /test

TODO: Remove got dependency

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