Error when testing Lambda: "Lambda was not able to unzip the file"

Question

After uploading a `.zip` containing code for my Lambda, I tried to test it using Lambda's built-in testing functionality. However, I get the following error:
```
Calling the invoke API action failed with this message: Lambda was not able to unzip the file
```
I can unzip the file locally with `unzip lambda.zip`, and running `unzip -l lambda.zip` shows that it contains the a `handler.js` as expected. I can even view the source code for the Lambda in the AWS console on the Lambda's Code tab.

It seems as though the Lambda runtime might be using a different (and broken?) way of decompressing ZIP archives?

Omid Eidivandi · Answer

That can be cause of size , as i just one time saw this error 5 years ago when packaging a large bundle which was self contained and larger that 250 MB unzipped , but i compressed that as 45M but i got this error

Check if you are not zipping the node_modules , or other heacy bundles

also verify if it s a real zip file

Check if you are not zipping the node_modules , or other heacy bundles

also verify if it s a real zip file

Brettski · Answer

How large is your ZIP file? If it is more than 50 MB (compressed) or 250 MB (uncompressed) it exceeds the [service limits](https://docs.aws.amazon.com/lambda/latest/dg/gettingstarted-limits.html). If you are exceeding that size, consider using a [container image](https://docs.aws.amazon.com/lambda/latest/dg/images-create.html).

Error when testing Lambda: "Lambda was not able to unzip the file"

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