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freedomw1987
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elysia-lambda-response-body-debug

Diagnose empty HTTP response bodies from Elysia.js apps on AWS Lambda.

2|Updated May 10, 2026
Search Tags:#debugging#serverless#nodejs#aws-lambda#elysia#api-gateway#response-body
One-click install
npx skills add https://github.com/freedomw1987/tree_monstor --skill elysia-lambda-response-body-debug
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: elysia-lambda-response-body-debug
Source: https://github.com/freedomw1987/tree_monstor/tree/main/skills/debugging/elysia-lambda-response-body-debug
Command: npx skills add https://github.com/freedomw1987/tree_monstor --skill elysia-lambda-response-body-debug

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

When deploying Elysia.js applications to AWS Lambda with API Gateway proxy integration, users encounter a common but frustrating issue: Lambda returns HTTP 200 status with the correct content-type: application/json header, but the response body is always empty (content-length: 0), with no errors visible in CloudWatch logs. This breaks all API functionality for end users, with no clear error messages to guide debugging.

Core Features & Use Cases

  • Targeted Root Cause Diagnosis: Step-by-step local tests to confirm the issue, isolate Elysia's custom Response implementation as the source, and compare arrayBuffer() vs text() behavior to pinpoint the failure point.
  • Verified Production Fix: A simple, tested code change to replace response.arrayBuffer() with response.text() in the Lambda handler, eliminating the empty body issue without unnecessary base64 encoding complexity.
  • Adjacent AWS Troubleshooting: Guidance for related deployment pitfalls including CDK Lambda permission drift causing 403 AccessDeniedException, API Gateway test-invoke vs real API error code mismatches, and Headers constructor bugs in Lambda Node.js 18 runtimes.
  • Real-World Use Case: A developer deploying an Elysia.js REST API to AWS Lambda can use this skill to resolve empty response bodies in minutes instead of spending hours debugging obscure Lambda runtime and AWS configuration quirks.

Quick Start

Use the elysia-lambda-response-body-debug skill to diagnose and fix empty response bodies for your Elysia.js application deployed to AWS Lambda by applying the verified handler code change.

Frequently Asked Questions about elysia-lambda-response-body-debug

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
Why does my Elysia.js AWS Lambda function return an empty response body with HTTP 200 and no CloudWatch errors?▼

Elysia.js returns an empty response body on AWS Lambda because the handler uses response.arrayBuffer(), which fails to serialize the custom Response object on the Node.js 18 runtime; replacing it with response.text() resolves the issue.

How do I fix the content-length 0 issue when deploying an Elysia.js API to AWS Lambda with API Gateway proxy integration?▼

Fix the content-length 0 issue by modifying your Lambda handler to call response.text() instead of response.arrayBuffer() when processing the Elysia Response object, avoiding unnecessary base64 encoding complexity.

Does AWS CDK permission drift cause 403 AccessDeniedException when testing an Elysia.js Lambda API Gateway integration?▼

Yes, AWS CDK permission drift causes 403 AccessDeniedException errors, and API Gateway test-invoke may show mismatched error codes compared to the real API, requiring AWS configuration troubleshooting alongside the Elysia handler fix.

What is the best way to debug an Elysia.js application returning correct application/json headers but no body content on Lambda?▼

The best way to debug this empty body issue is to perform local tests comparing arrayBuffer() versus text() behavior to isolate Elysia's custom Response implementation as the root cause before applying the handler fix.

Are there known limitations or runtime bugs with the Headers constructor in AWS Lambda Node.js 18 when using Elysia.js?▼

Yes, the Headers constructor has known bugs in the AWS Lambda Node.js 18 runtime that can affect Elysia.js applications, requiring you to address these adjacent AWS configuration issues during deployment troubleshooting.

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