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Graph/serverless-file-handling-constraints

Pattern

Serverless File Handling Constraints

serverless-file-handling-constraints

Serverless uploads and exports fail or misbehave because runtime storage, permissions, and multipart sizing limits differ (read-only dirs, small /tmp, presigned-url chunking), leading to truncated/incorrect artifacts and hard-to-predict part boundaries.

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Public graph metadata

Updated7/16/2026

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30 linked nodes

some Lambda functions and web pages contain ~3 MBs of minified JavaScript whereas they should be less than 1 MB

it uploads the file successfully, but just dumps the file on the "root" directory in Vercel blob storage — upload an image for example via the Payload admin upload feature. Tension: This makes my blob storage explorer in Vercel look very messy. Outcome: I would therefore very much like a folder for each project.

Uploaded images using Multer are not appearing on the Vercel-deployed Express server and cannot be referenced by a stable 'path/to/image' under a local uploads directory.

EROFS: read-only file system, open '/var/task/public/bb17ad93-017f-4fdf-a2db-713d9a390143.webp' — When i try to upload file to public folder on vercel. Tension: works perfectly fine in my dev environment(local computer) but after deploying to vercel it throws that error. Outcome: you want to persist the file then better to store somewhere, probably in S3.

This code works but is not in production. — upload files using an API and then store them inside the public folder of Nuxt. Tension: the file directory will change in production. Outcome: you CANNOT use public folder for serving dynamic images.

requests with the forbidden fields sailed through to the write path. Tension: accepting them would let one client rewrite server-derived state. Outcome: surfacing as a 500 from an unrelated downstream failure in our integration test.

Need to deploy a multi-file GitHub repository to AWS Lambda

using pre-signed-url, I can't check the file size of each part — multipart upload in my application. Tension: all the options I thought do not appear to be good one. Outcome: I really would not like to get the file in any endpoint of my application.

socket usage at capacity=50 and 179 additional requests are enqueued — I have a NextJS website that uses S3 to read and write data for images and audio. Tension: Since the site went live and got a fair few users, I started receiving the following error seemingly every time someone made a request.

aws s3 sync and aws s3 cp fail with MissingContentLength / stream is not seekable errors

while running an AWS Lambda function. Tension: The data fetching and processing is good, but the function crashes during the file upload step. Outcome: I’ve tried increasing memory allocation and execution time without success.

All of the put/upload functions want a set content length. Tension: Building the zip locally is not an option, because the end size of the zip can be tens of GB. Outcome: I essentially need a zip "placeholder" on S3 that I can stream to.

The HTTP request cannot be executed: The peer resets the connection. — When I try to upload files to S3 from storage via an application deployed on the stand. Tension: Everything is working locally. All files is uploading without errors. Outcome: com.amazonaws.SdkClientException exception.

nothing is getting written to the s3 bucket — trying to use ytdl-core in an AWS lambda function to upload an .mp4 of a youtube video to an S3 bucket. Tension: I cannot get ytdl to create a stream with any data in it. Outcome: Right now nothing is getting pushed to the buffer or the s3 bucket.

I'm getting CORS error — I'm trying to generate s3 presigned url to upload `video/mp4` files to a bucket from react app client in development mode in my localhost. Tension: the whole thing starts working after a few hours without any changes to the setup. Outcome: the presigned url stops giving cors error.

facing throttling issues (503 errors) — writing to S3, and facing throttling issues (503 errors). Tension: our ingestion service still encounters 503 errors. Outcome: the files are showing right under my bucket at the root level.

The AWS Lambda function is not being triggered when new files are uploaded to an S3 bucket. The configured S3 notification is set to respond to HTTP POST events, but no events occur and the code never runs.

iterating over 400k objects can take hours — using latest minio in docker on two servers. Tension: Sometimes it works fine. Outcome: How to speed it up?

Unable to parse request (not well-formed (invalid token): line 1, column 0), invalid XML received — using node.js to upload image to my s3 bucket on my local environment using localstack. Tension: This issue stems from using `Virtual-Hosted` style requests against LocalStack when using `localhost` as the endpoint. Outcome: the simplest would be to use `s3ForcePathStyle` for your client.

Unit tests cannot deterministically simulate S3 upload failure

Minio upload with a stream blocks until the file stream is closed

How to upload images to amazon s3 bucket on nextjs13 using app router? — I tried using formidable and multer but both soltions are not working as nextjs changes their api routes structure. Tension: How to pass the buffer and store the image on s3 bucket ??? Outcome: Finally after much trying, here is the solution:.

aws s3 ls s3://bucketname > out.txt does not efficiently export 10m S3 objects as file URLs

CloudFormation deployment using the Serverless Framework fails when creating the S3 bucket policy: CREATE_FAILED for AWS::S3::BucketPolicy with s3:PutBucketPolicy Access Denied.

when I try uploading from mobile browsers, the upload just loads forever — I'm building a document uploader using Supabase Storage. Outcome: I've tried using different networks, browsers and devices, but it's still the same problem.

Accessing /admin in a NextJS app using the PayloadCMS S3Storage plugin fails with the error: "useUploadHandlers must be used within UploadHandlersProvider".

Uploading a 12MB CSV to a Next.js API route fails with a 413 Payload Too Large error, meaning the request exceeds the server’s allowed body size. Attempts to increase the limit via `export const config` cause a build error due to deprecated config usage.

String value length (20048537) exceeds the maximum allowed (20000000, from StreamReadConstraints.getMaxStringLength()) — Spring Boot application where I'm trying to upload files or large content through a REST endpoint. Tension: the request is being rejected by Spring Boot. Outcome: Once I stopped sending the file in JSON, the problem disappeared.

415 Unsupported Media Type — upload a property object (JSON) along with multiple images using `multipart/form-data`. Tension: Content-Type 'application/octet-stream' is not supported. Outcome: Here is a Postman example that worked for me with Spring.

File uploads submitted from Safari to a Tomcat server become corrupted when HTTP/2 is enabled; uploads succeed in Chrome and when HTTP/2 is disabled. The issue affects multiple medium-sized files (a few MB).

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