AWS SDK for JavaScript to Boto3 Converter

How to convert AWS SDK JavaScript code to boto3

1. Add your codePaste it into the AWS SDK (JS/TS) editor, drag in a file, or keep the sample to see how it works.
2. Convert to PythonClick the button or press Ctrl + Enter. The result streams into the right-hand editor.
3. Review and use itCopy or download the result, then test it before you rely on it. AI output is a strong first draft, not a guarantee.

How JavaScript AWS SDK calls map to boto3

Both SDKs call the same AWS APIs with the same parameter names, so most of the work is translating structure rather than logic. A v3 client.send(new ListObjectsV2Command(params)) or a v2 s3.listObjectsV2(params).promise() becomes s3.list_objects_v2(**params) in boto3. Method names switch to snake_case, but request and response keys like Bucket and Contents stay in PascalCase.

Async code becomes synchronous. boto3 calls block, so await and Promise.all turn into plain calls, or a thread pool if you need concurrency. Pagination helpers become boto3 paginators, and DynamoDB's DocumentClient usually maps to the boto3 resource API (boto3.resource("dynamodb").Table(...)), which also works with native Python types.

Errors work differently too. JavaScript code that checks err.name or err.code becomes a try/except botocore.exceptions.ClientError block that reads err.response["Error"]["Code"], as described in the boto3 error handling guide.

Tips for better results

• Paste the whole function with its imports. The imports show whether the code uses SDK v2 or v3 and which clients it needs.
• Check number and date types. DynamoDB's resource API returns numbers as Decimal, and S3 timestamps are datetime objects rather than JavaScript Dates.
• Decide on concurrency. Promise.all has no direct equivalent. Keep calls sequential, or use concurrent.futures with one client per thread if speed matters.
• Read S3 bodies explicitly. get_object returns a StreamingBody, so call .read() and decode it where the JavaScript code used a Buffer or stream.
• Rely on the default credential chain. Like the JavaScript SDK, boto3 finds credentials in environment variables, ~/.aws profiles or the Lambda role, so don't add keys to the code.

Frequently asked questions