Invalid base64 error Lambda AWS CLI

2023-03-20 · Thomas Taylor

The Invalid base64 error occurs when invoking a lambda from the AWS CLI because the default --payload parameter expects base64 encoding.

1aws lambda invoke --function-name test --payload '{"movie": "John Wick"}' response.json

Error output:

1Invalid base64: "{"movie": "John Wick"}"

Solve `Invalid base64` lambda invoke error

To solve the Invalid base64 error, supply the --cli-binary-format parameter with the value raw-in-base64-out:

1aws lambda invoke --function-name test --cli-binary-format raw-in-base64-out --payload '{"movie": "John Wick"}' response.json

Output:

1{
2	"StatusCode": 200,
3	"ExecutedVersion": "$LATEST"
4}

A user may opt to supply a .json file:

1{
2	"movie": "John Wick"
3}

1aws lambda invoke --function-name test --cli-binary-format raw-in-base64-out --payload file://request.json response.json