---
title: Install the InfluxDB v2 JavaScript client library
description: Install the Node.js JavaScript client library to write data to an InfluxDB Core database.
url: https://docs.influxdata.com/influxdb3/core/reference/client-libraries/v2/javascript/nodejs/install/
estimated_tokens: 1536
product: InfluxDB 3 Core
version: core
---

# Install the InfluxDB v2 JavaScript client library

#### Use InfluxDB 3 clients to query

InfluxDB 3 supports [compatibility endpoints for *writing data*](/influxdb3/core/write-data/compatibility-apis/) using InfluxDB v2 and v1 tools. However, the `/api/v2/query` API endpoint and associated tooling, such as InfluxDB v2 client libraries and the `influx` CLI, *can’t query* data stored in InfluxDB 3 Core.

[InfluxDB 3 client libraries](/influxdb3/core/reference/client-libraries/v3/) are available that integrate with your code to write and query data stored in InfluxDB 3 Core.

[**Compare tools you can use**](/influxdb3/core/get-started/#tools-to-use) to interact with InfluxDB 3 Core.

## Install Node.js

1. Install [Node.js](https://nodejs.org/en/download/package-manager/).
    
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.
    
    ```sh
    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
    
    ```sh
    npm init -y
    ```
    

## Install TypeScript

Many of the client library examples use [TypeScript](https://www.typescriptlang.org/). Follow these steps to initialize the TypeScript project:

1. Install TypeScript and type definitions for Node.js.
    
    ```sh
    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:
    
    ```sh
    tsc --init
    ```
    
3. Run the TypeScript compiler. To recompile your code automatically as you make changes, pass the `--watch, -w` flag to the compiler.
    
    ```sh
    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:

```sh
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`](https://github.com/influxdata/influxdb-client-js/blob/master/examples/env.js) 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](/influxdb3/core/admin/databases/), organization (required, but ignored), [database token](/influxdb3/core/admin/tokens/#database-tokens), and cluster URL.

```sh
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](/influxdb3/core/reference/client-libraries/v2/javascript/nodejs/write/) to InfluxDB.

[Write data](/influxdb3/core/reference/client-libraries/v2/javascript/nodejs/write/)

[client libraries](/influxdb3/core/tags/client-libraries/) [JavaScript](/influxdb3/core/tags/javascript/)