在s3上读取json文件并在lambda上返回

'use strict';
const AWS = require('aws-sdk');
const s3 = new AWS.S3({region: 'your-region'});

module.exports.s3json = async (event, context) => {
    let bucket = event.bucket || 'your-bucket';
    let file = event.filename || 'your-file-path';

    let data = await s3.getObject({
        Bucket: bucket,
        Key: file
    }).promise();
    return {
        statusCode: 200,
        body: JSON.parse(data.Body.toString())
    };
};