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continuation-local-storage

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continuation-local-storage

userland implementation of https://github.com/joyent/node/issues/5243


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What is continuation-local-storage?

The continuation-local-storage (CLS) npm package provides a way to maintain context across asynchronous calls in Node.js. It allows you to create a namespace to store data that is accessible across different asynchronous operations, which is useful for tasks like logging, error tracking, and request tracing.

What are continuation-local-storage's main functionalities?

Creating a Namespace

This feature allows you to create a namespace where you can store and retrieve data across asynchronous calls.

const cls = require('continuation-local-storage');
const namespace = cls.createNamespace('myNamespace');

Setting and Getting Data

Within a namespace, you can set and get data that will be available throughout the asynchronous call chain.

namespace.run(() => {
  namespace.set('key', 'value');
  console.log(namespace.get('key')); // Outputs: value
});

Using with Asynchronous Functions

This feature demonstrates how to use CLS with asynchronous functions, ensuring that the context is maintained across asynchronous boundaries.

const asyncFunction = async () => {
  namespace.set('key', 'value');
  await new Promise(resolve => setTimeout(resolve, 1000));
  console.log(namespace.get('key')); // Outputs: value
};

namespace.run(() => {
  asyncFunction();
});

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Package last updated on 20 Nov 2017

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