docs-v2/content/influxdb/cloud-serverless/reference/client-libraries/v2/javascript/nodejs/write.md

title	list_title	description	menu	influxdb/cloud-serverless/tags	weight	aliases	related
Write data with the InfluxDB v2 JavaScript client library	Write data	The JavaScript client library integrates with Node.js applications to write data to an InfluxDB Cloud Serverless bucket.	influxdb_cloud_serverless name parent Write Node.js	client libraries JavaScript	101	/influxdb/cloud-serverless/reference/api/client-libraries/nodejs/write/	/influxdb/cloud-serverless/write-data/troubleshoot/

Use the InfluxDB v2 Javascript client library 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.

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).

   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](/influxdb/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](/influxdb/cloud-serverless/reference/glossary/#point).
1. Call the constructor and provide a [measurement](/influxdb/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, run the following command to execute the JavaScript file:

node write.js

Response codes

For information about InfluxDB API response codes, see InfluxDB API Write documentation.