API Gateway unable to decode base64

Question

I am attempting to use a node based lambda function to return jpeg images from s3, using API Gateway.

My Lambda function reads as:

s3.getObject(params).promise().then((result) => { 
    let resp = {
                statusCode: 200,
                headers: {
                    'Content-Type': 'image/jpeg'
                },
                body: result.Body.toString('base64'),
                isBase64Encoded: true
    };          
    callback(null, resp);
});

I have also modified the integration response in API gateway to "Convert to binary (if needed)". When I try testing this function I receive the error "Execution failed due to configuration error: Unable to base64 decode the body.".

Is there a step I am missing to allow me to retrieve base64 encoded files?

balsick · Accepted Answer · 2018-03-25 14:54:20Z

2

I'm not sure about it, but have you tried to use this instead of the toString called directly on your object?

Buffer.from(result.Body).toString('base64')

answered Mar 25, 2018 at 14:54

balsick

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Comments

Vitalii Budkevych · Accepted Answer · 2017-04-11 20:27:43Z

-1

Sounds like you're using AWS integration type of API Gateway instead of LAMBDA integration and in that case API Gateway would expect entire message to be base64 encoded, not just the body. For your use case you probably should use LAMBDA integration and return json with statusCode, body, headers, and Content-Type as you currently do.

answered Apr 11, 2017 at 20:27

Vitalii Budkevych

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1 Comment

Rabona Over a year ago

Integration type is already set as LAMBDA if this is what you are referring to?

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