Install the InfluxDB v2 JavaScript client library

Install Node.js

1. Install Node.js.

2. Ensure that InfluxDB is running and you can connect to it. For information about what URL to use to connect to your InfluxDB 3 Core cluster, contact your InfluxData account representative.

3. In your terminal, create a directory for your Node.js project and change to it.

   mkdir influx-node-app && cd influx-node-app

4. Enter the following command to generate an npm package for your project.

   • npm: the package manager included with Node.js
   • -y: uses defaults for the package and bypasses prompts

   npm init -y

Install TypeScript

Many of the client library examples use TypeScript. Follow these steps to initialize the TypeScript project:

1. Install TypeScript and type definitions for Node.js.

   npm i -g typescript && npm i --save-dev @types/node

2. Enter the following command to create a TypeScript configuration (tsconfig.json) with default values:

   tsc --init

3. Run the TypeScript compiler. To recompile your code automatically as you make changes, pass the --watch, -w flag to the compiler.

   tsc --watch

Install dependencies

Use the @influxdata/influxdb-client JavaScript client library to write data in InfluxDB 3 Core.

Open a new terminal window and install the @influxdata/influxdb-client package for querying and writing data:

npm i --save @influxdata/influxdb-client

The @influxdata/influxdb-client-apis client library package won’t work with InfluxDB 3 Core. It only works with InfluxDB v2 management APIs.

Configure credentials

The client examples include an env module for accessing your InfluxDB properties from environment variables or from env.js. The examples use these properties to interact with the InfluxDB API.

Set environment variables or update env.js with your InfluxDB database, organization (required, but ignored), database token, and cluster URL.

export INFLUX_URL=https://localhost:8181
export INFLUX_TOKEN=DATABASE_TOKEN
export INFLUX_ORG=ORG_ID
export INFLUX_DATABASE=DATABASE_NAME

Replace the following:

• DATABASE_TOKEN: InfluxDB database token
• ORG_ID: An arbitrary string (InfluxDB ignores this credential, but the client library requires it)
• DATABASE_NAME: InfluxDB database name

Next steps

Once you’ve installed the client library and configured credentials, you’re ready to write data to InfluxDB.