---
title: Write data with the InfluxDB v2 JavaScript client library
description: The JavaScript client library integrates with Node.js applications to write data to an InfluxDB Cloud Serverless bucket.
url: https://docs.influxdata.com/influxdb3/cloud-serverless/reference/client-libraries/v2/javascript/nodejs/write/
estimated_tokens: 1686
product: InfluxDB Cloud Serverless
version: cloud-serverless
---

# Write data with the InfluxDB v2 JavaScript client library

### Use InfluxDB 3 clients

The `/api/v2/query` API endpoint and associated tooling, such as InfluxDB v2 client libraries and the `influx` CLI, **can’t** query an InfluxDB Cloud Serverless cluster.

[InfluxDB 3 client libraries](/influxdb3/cloud-serverless/client-libraries/v3/) are available that integrate with your code to write and query data stored in InfluxDB Cloud Serverless.

InfluxDB 3 supports many different tools for [**writing**](/influxdb3/cloud-serverless/write-data/) and [**querying**](/influxdb3/cloud-serverless/query-data/) data. [**Compare tools you can use**](/influxdb3/cloud-serverless/get-started/#tools-to-use) to interact with InfluxDB Cloud Serverless.

Use the [InfluxDB v2 JavaScript client library](https://github.com/influxdata/influxdb-client-js) to write data from a Node.js environment to InfluxDB.

The JavaScript client library includes the following convenient features for writing data to InfluxDB:

-   Apply default tags to data points.
-   Buffer points into batches to optimize data transfer.
-   Automatically retry requests on failure.
-   Set an optional HTTP proxy address for your network.

### Before you begin

-   [Install the client library and other dependencies](/influxdb3/cloud-serverless/reference/client-libraries/v2/javascript/nodejs/install/).

### Write data with the client library

1. Instantiate a client by calling the `new InfluxDB()` constructor with your InfluxDB URL and API token (environment variables you already set in the [Install section](/influxdb3/cloud-serverless/reference/client-libraries/v2/javascript/nodejs/install/)).
    
    ```js
    import {InfluxDB, Point} from '@influxdata/influxdb-client'
    
    const influxDB = new InfluxDB({url: process.env.INFLUX_URL,
                                   token: process.env.INFLUX_TOKEN})
    ```
    
2. Use the `getWriteApi()` method of the client to create a **write client**. Provide your InfluxDB organization ID and bucket name.
    

const writeApi = influxDB.getWriteApi(process.env.INFLUX\_ORG, process.env.INFLUX\_BUCKET)

```

3. To apply one or more [tags](/influxdb3/cloud-serverless/reference/glossary/#tag) to all points, use the `useDefaultTags()` method.
Provide tags as an object of key/value pairs.

 ```js
 writeApi.useDefaultTags({region: 'west'})
 ```

4. Use the `Point()` constructor to create a [point](/influxdb3/cloud-serverless/reference/glossary/#point).
1. Call the constructor and provide a [measurement](/influxdb3/cloud-serverless/reference/glossary/#measurement).
2. To add one or more tags, chain the `tag()` method to the constructor.
   Provide a `name` and `value`.
3. To add a field of type `float`, chain the `floatField()` method to the constructor.
   Provide a `name` and `value`.

 ```js
 const point1 = new Point('temperature')
   .tag('sensor_id', 'TLM010')
   .floatField('value', 24.0)
 ```

5. Use the `writePoint()` method to write the point to your InfluxDB bucket.
Finally, use the `close()` method to flush all pending writes.
The example logs the new data point followed by "WRITE FINISHED" to stdout.

 ```js
 writeApi.writePoint(point1)

 writeApi.close().then(() => {
   console.log('WRITE FINISHED')
 })
 ```

### Complete example

```js
'use strict'
/** @module write
* Writes a data point to InfluxDB using the JavaScript client library with Node.js.
**/

import {InfluxDB, Point} from '@influxdata/influxdb-client'

/**
* Instantiate the InfluxDB client.
* Provide your InfluxDB URL and API token.
**/
const influxDB = new InfluxDB({url: process.env.INFLUX_URL,
                           token: process.env.INFLUX_TOKEN})

/**
* Create a write client from the getWriteApi method.
* Provide your org and bucket.
**/
const writeApi = influxDB.getWriteApi(process.env.INFLUX_ORG,
                                   process.env.INFLUX_BUCKET)

/**
* Apply default tags to all points.
**/
writeApi.useDefaultTags({region: 'west'})

/**
* Create a point and write it to the buffer.
**/
const point1 = new Point('temperature')
.tag('sensor_id', 'TLM01')
.floatField('value', 24.0)
console.log(` ${point1}`)

writeApi.writePoint(point1)

/**
* Flush pending writes and close writeApi.
**/
writeApi.close().then(() => {
console.log('WRITE FINISHED')
})
```

In your terminal with [environment variables or `env.js` set](/influxdb3/cloud-serverless/reference/client-libraries/v2/javascript/nodejs/install/#configure-credentials), run the following command to execute the JavaScript file:

```sh
node write.js
```

### Response codes

*For information about **InfluxDB API response codes**, see [InfluxDB API Write documentation](/influxdb3/cloud-serverless/api/write-data/#operation/PostWrite).*

#### Related

-   [Troubleshoot issues writing data](/influxdb3/cloud-serverless/write-data/troubleshoot/)