{"id":17806,"library":"middy-autoproxyresponse","title":"Middy AutoProxyResponse Middleware","description":"The `middy-autoproxyresponse` middleware was designed to simplify AWS Lambda proxy responses by automatically wrapping plain JavaScript objects returned from a handler into a `statusCode: 200` response with `Content-Type: application/json`. If a `statusCode` is already present in the returned object, it passes through untouched. The package is currently at version 0.1.0, released in 2018. Given the rapid evolution and numerous breaking changes in the core `middy` framework (which is now in its 7.x series, released frequently), this middleware is highly likely incompatible with modern `middy` versions (v2.x and above), especially since `middy` v5+ is ESM-only. It provides a basic utility that is often reimplemented or achieved with other, more actively maintained `middy` middlewares like `@middy/http-response-serializer` for newer versions.","status":"abandoned","version":"0.1.0","language":"javascript","source_language":"en","source_url":null,"tags":["javascript","typescript"],"install":[{"cmd":"npm install middy-autoproxyresponse","lang":"bash","label":"npm"},{"cmd":"yarn add middy-autoproxyresponse","lang":"bash","label":"yarn"},{"cmd":"pnpm add middy-autoproxyresponse","lang":"bash","label":"pnpm"}],"dependencies":[{"reason":"This is a middleware for the Middy.js framework. Likely only compatible with Middy v0.x or v1.x.","package":"middy","optional":false}],"imports":[{"note":"While the README shows ESM import, this old package (v0.1.0) likely ships as CommonJS. Newer Middy (v5+) is ESM-only, leading to potential module resolution issues if used with modern Middy.","wrong":"const { autoProxyResponse } = require('middy-autoproxyresponse')","symbol":"autoProxyResponse","correct":"import { autoProxyResponse } from 'middy-autoproxyresponse'"},{"note":"The core `middy` package itself changed import paths and module types significantly. Since `middy` v2.x, core components are typically imported from `@middy/core`. Since v5.x, Middy is ESM-only.","wrong":"const middy = require('middy')","symbol":"middy","correct":"import middy from '@middy/core'"}],"quickstart":{"code":"import middy from '@middy/core';\nimport { autoProxyResponse } from 'middy-autoproxyresponse';\n\ninterface MyEvent {\n  name?: string;\n}\n\ninterface MyContext extends Record<string, any> {}\n\nasync function handler(event: MyEvent, context: MyContext) {\n  // Simulate some async operation\n  await new Promise(resolve => setTimeout(resolve, 100));\n\n  if (event.name) {\n    return { message: `Hello, ${event.name}!` };\n  } else {\n    // This will be converted to a 200 OK JSON response by autoProxyResponse\n    return { greeting: 'Hello, world!' };\n  }\n}\n\nexport const wrappedHandler = middy(handler)\n  .use(autoProxyResponse());\n\n// To simulate execution (e.g., for local testing)\n// wrappedHandler({ name: 'Registry' }, {} as MyContext)\n//   .then(res => console.log('Response:', JSON.stringify(res, null, 2)));\n","lang":"typescript","description":"Demonstrates defining a simple Lambda handler that returns a plain object, which `autoProxyResponse` then converts into a standard API Gateway proxy response."},"warnings":[{"fix":"Consider using the actively maintained `@middy/http-response-serializer` (or similar core middy middlewares) for modern Middy versions, or implementing the response transformation manually.","message":"This middleware (v0.1.0) was developed for an older version of the `middy` framework (likely v0.x or v1.x). It is highly unlikely to be compatible with `middy` v2.x, v3.x, v4.x, or newer due to significant internal breaking changes in `middy`'s core API and middleware lifecycle.","severity":"breaking","affected_versions":">=2.0.0"},{"fix":"Avoid using this middleware with `middy` v5.0.0 or later. Migrate to `middy`'s native HTTP response handling or use a modern, ESM-compatible alternative.","message":"The `middy` framework, starting from v5.0.0, is ESM-only (ECMAScript Modules). This `middy-autoproxyresponse` package (v0.1.0) is a CommonJS module. Using a CommonJS middleware with an ESM-only core framework will result in module resolution errors unless specific build configurations are applied (which is not officially supported or recommended).","severity":"breaking","affected_versions":">=5.0.0"},{"fix":"For new projects or migrations, prefer `@middy/http-response-serializer` or similar from the official `@middy` ecosystem.","message":"The functionality provided by `middy-autoproxyresponse` (converting plain objects to API Gateway proxy responses) is now commonly handled by official `middy` core middlewares like `@middy/http-response-serializer` which offer more robust and configurable options.","severity":"deprecated","affected_versions":">=0.1.0"}],"env_vars":null,"last_verified":"2026-04-23T00:00:00.000Z","next_check":"2026-07-22T00:00:00.000Z","problems":[{"fix":"This specific middleware is CommonJS. If you are using a recent version of `middy` (v5.x+) which is ESM-only, `middy-autoproxyresponse` is fundamentally incompatible. Downgrade `middy` to a compatible version (v0.x or v1.x) or replace this middleware with an ESM-compatible alternative.","cause":"Attempting to `import` a CommonJS module in an ESM context, or vice-versa, which is common when mixing older middleware with newer `middy` versions or Node.js runtimes.","error":"SyntaxError: Cannot use import statement outside a module"},{"fix":"Ensure that the `middy` core package version is compatible with this middleware (likely `middy@^0.x` or `middy@^1.x`). Given this middleware's age, it's safer to use an actively maintained middleware for current `middy` versions.","cause":"Attempting to use `middy-autoproxyresponse` with an incompatible `middy` core version, where the `middy()` wrapper might have changed its API or is not correctly imported.","error":"TypeError: handler.use is not a function"}],"ecosystem":"npm","meta_description":null,"install_score":null,"install_tag":null,"quickstart_score":null,"quickstart_tag":null}