# How should i specify params for s3.putObject() ? (node.js)
**URL:** https://forum.serverless.com/t/how-should-i-specify-params-for-s3-putobject-node-js/10128
**Category:** Serverless Framework
**Tags:** aws
**Created:** [December 23, 2019, 2:37am UTC](https://forum.serverless.com/t/how-should-i-specify-params-for-s3-putobject-node-js/10128 "2019-12-23T02:37:12Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@RenatAsadulov](https://forum.serverless.com/u/RenatAsadulov)
#### Post date: [December 23, 2019, 2:37am UTC](https://forum.serverless.com/t/how-should-i-specify-params-for-s3-putobject-node-js/10128/1 "2019-12-23T02:37:12Z")
Hello everybody! I am new to this so sorry for such silly question 😃
I’m trying to update my .csv file in s3 bucket but got no clue how to handle it.
Seems like i found the right method but still have nothing in the end.
Let me show u how i do this.
const params ={
```
Bucket: 'myBucketName',
Key: 'something.csv',
Body: JSON.stringify(itemToUpload)
}
```
s3.putObject(params).promise();
I’m trying to specify my bucket in .yml file but it rejects with an error like “Bucket already exists”.
What should i do to solve my problem?
---
### Author:  [@hoang-innomizetech](https://forum.serverless.com/u/hoang-innomizetech)
#### Post date: [December 23, 2019, 2:42am UTC](https://forum.serverless.com/t/how-should-i-specify-params-for-s3-putobject-node-js/10128/2 "2019-12-23T02:42:25Z")
Post full code should be better
---
### Author:  [@RenatAsadulov](https://forum.serverless.com/u/RenatAsadulov)
#### Post date: [December 23, 2019, 2:46am UTC](https://forum.serverless.com/t/how-should-i-specify-params-for-s3-putobject-node-js/10128/3 "2019-12-23T02:46:27Z")
const AWS = require(‘aws-sdk’);
const documentClient = new AWS.DynamoDB.DocumentClient();
const s3 = new AWS.S3({ region: ‘eu-west-1’ });
const bucketName = process.env.bucketName;
const fiveMinsInMili = process.env.fiveMinsInMili;
exports.handler = async event =\> {
```
console.log('event', event);
console.log('save to s3 lambda');
const nowTimestamp = new Date().getTime();
const params = {
TableName: 'Weather',
Select: "ALL_ATTRIBUTES"
};
const items = await documentClient.scan(params).promise();
const { Items } = items;
s3.putObject(params).promise();
Items.map(i => {
if (nowTimestamp - i.timestamp <= fiveMinsInMili) {
const putParams = {
Bucket: bucketName,
Key: 'weather.csv',
Body: JSON.stringify(i)
}
s3.putObject(putParams, (err) => {
if (err) console.log(err);
else console.log('Its OK!');
})
}})
```
};
---
### Author:  [@RenatAsadulov](https://forum.serverless.com/u/RenatAsadulov)
#### Post date: [December 23, 2019, 10:59am UTC](https://forum.serverless.com/t/how-should-i-specify-params-for-s3-putobject-node-js/10128/4 "2019-12-23T10:59:41Z")
I solved it with adding
- Effect: “Allow”
to .yml file 🙂