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const AWS = require('aws-sdk');
const S3 = new AWS.S3({'region':'ap-northeast-1'});
exports.handler = async (event) => {
let params = {
'Bucket': 'バケット名',
'Key': 'hoge/sample.json'
const data = await existFile(params)
async function existFile(params){
let bool = true
await S3.getObject(params).promise().catch(e=>{
bool = false
return bool
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