Bash script to download all your Lambda functions.

ExportLambdaFunctions.sh

#!/usr/bin/env bash
#You need to have aws-cli installed and configured
#Credits to Reddit user u/aa93 for the suggestions

mkdir code
aws lambda list-functions | \
grep FunctionName | \
cut -d '"' -f4 | \
while read -r name; do
    aws lambda get-function --function-name $name | tail -n 3 | egrep -o 'https?://[^ ]+' | sed 's/"//' | xargs wget -O ./code/$name.zip
done

The scripts above were not working, below is a script which is working like a charm. It has the ability to search through all regions or you can enter a region yourself. Hope it helps!

#!/usr/bin/env bash
set -euo pipefail

# Check for dependencies: aws, jq, unzip
if ! command -v aws &>/dev/null; then
  echo "ERROR: aws CLI is not installed. Please install it and try again."
  exit 1
fi

if ! command -v jq &>/dev/null; then
  echo "ERROR: jq is not installed. Please install it (e.g. brew install jq) and try again."
  exit 1
fi

if ! command -v unzip &>/dev/null; then
  echo "ERROR: unzip is not installed. Please install it (e.g. brew install unzip) and try again."
  exit 1
fi

# You can hard-code specific regions if desired, for example:
# REGIONS=("us-east-1" "us-west-2")
# Or dynamically discover them:
REGIONS=($(aws ec2 describe-regions --query "Regions[].RegionName" --output text))

for region in "${REGIONS[@]}"; do
  echo ">>> Processing region: $region"
  
  # Get all Lambda function names in this region
  FUNCTIONS=($(aws lambda list-functions \
    --region "$region" \
    --query "Functions[].FunctionName" \
    --output text))
  
  if [ ${#FUNCTIONS[@]} -eq 0 ]; then
    echo "No Lambda functions found in region: $region"
    continue
  fi

  # Create a directory for this region (if you want them grouped by region)
  mkdir -p "$region"
  
  for function_name in "${FUNCTIONS[@]}"; do
    echo "  - Downloading source for function: $function_name"
    
    # Create a subdirectory for each function to store source files
    function_dir="$region/$function_name"
    mkdir -p "$function_dir"
    
    # Get the presigned URL for the Lambda function code
    code_url=$(aws lambda get-function \
      --region "$region" \
      --function-name "$function_name" \
      --query "Code.Location" \
      --output text)
    
    # Download the ZIP
    zip_file="$function_dir/source.zip"
    curl -s -o "$zip_file" "$code_url"
    
    # Unzip into the function's directory
    echo "    => Unzipping to $function_dir"
    unzip -oq "$zip_file" -d "$function_dir"
    
    # Optional: Remove the ZIP after unzipping
    rm "$zip_file"
    
    echo "    => Source code retrieved for $function_name"
  done

  echo "Finished region: $region"
done

echo "All done!"