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Graph/read-only-runtime-storage

Pattern

Read-Only Serverless Storage

read-only-runtime-storage

Runtime code tries to write or modify files in Vercel’s deployed app directory (including public), but serverless environments mount that path read-only, so endpoints and app loads fail or only work when redirected to temporary storage like /tmp.

Node Details

Public graph metadata

Updated8/5/2026

Connections

30 linked nodes

FastAPI route works locally on / but fails on Vercel

`apps/serverless/tsconfig.json` is read by Vercel CLI because it crashes if I remove a curly bracket — The serverless app is part of a Turborepos monorepos (`apps/serverless`);. Tension: There is no root level `tsconfig.json`;. Outcome: I have tried different value permutations for the `exclude`/`include` fields.

Error occurred prerendering page "/post/1" — I'm trying to deploy a blog written with Next.js v15.3.3 with Vercel. Tension: TypeError: Cannot read properties of null (reading 'useState'). Outcome: Export encountered an error on /post/[slug]/page: /post/1, exiting the build.

GET https://cooking-assistant-phi.vercel.app/static/css/style.css net::ERR_ABORTED 404 (Not Found) — I'm deploying a Flask app to Vercel. Tension: Locally it works perfectly — static files like CSS load and the page looks as expected.

After the first request, all subsequent requests return the same timestamp — deploying to Vercel. Tension: even though I'm using new Date() in the handler. Outcome: The primary issue is with function instances being reused in Vercel's serverless environment.

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.

Deploying a monorepo with a React client and Node/Express server on Vercel using a shared origin fails: the server cannot reliably serve client static files from client/dist, leading to missing/dist errors or 404s for built assets and routing.

Cookie “__vercel_live_token” has been rejected because it is in a cross-site context and its “SameSite” is “Lax” or “Strict” — deployed it on Vercel. Tension: But i setup cookies in my project like this. Outcome: Then you need to use https://localhost:5000 and not http://localhost:5000.

Error: Can't deploy more than one path. Tension: I already tried to delete the vercel.json file as there are two cron jobs defined which according to the vercel AI assistant could possibly cause the issue. Outcome: Verion of Vercel CLI: 37.14.0.

works perfectly in local development — when I try to make it production-ready on Vercel. Tension: I encounter issues.

When accessing a bad url supposed to be 404 have this error `This Serverless Function has crashed.` — Angular SSR deployed on Vercel Serveless Function. Tension: my angular app routing could never do the job of redirecting to the correct /404 or just display the 404 component.

Angular SSR deployed on Vercel Serveless Function. Outcome: It also works doing `node dist/project/server/server.mjs` (after a build using server.ts).

Cannot find module '/Users/aidan/work/real-estate/forecasa-serverless-functions-express/api/stateStorage' imported from /Users/aidan/work/real-estate/forecasa-serverless-functions-express/api/companyContact.ts — when running vercel dev.

Deploying to Vercel fails to apply the desired npm install flags (e.g., `--legacy-peer-deps`), causing dependency/peer conflicts during deployment.

Refused to load the script 'https://conoret.com/dsp?h=car-doctor-server-bay-rho.vercel.app&r=0.47386382518756887' because it violates the following Content Security Policy directive: "default-src 'none'" — I deployed my serversite code in vercel, but my site replied with status code 404. Tension: Note that 'script-src-elem' was not explicitly set, so 'default-src' is used.

Some Next.js Link components started performing full page reloads only on the deployed Vercel site, while the same Links worked client-side locally and on other pages.

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.

the Vercel app immediately bounces me back to my log-in screen — deploying with Vercel. Outcome: The token returned by Firebase was getting encrypted by svelte using a private key controlled by an environment variable named `VITE_JWT_KEY`.

"error": "bad auth: authentication failed" — in production on Vercel. Tension: I don't have any authentication set up for this API. Outcome: My .env file on Vercel was set to an outdated database password.

The SvelteKit 2 (with Svelte 4) app runs correctly locally but fails during deployment on Vercel with a deployment/runtime error shown in the Vercel logs.

Requests from a Next.js app to Vercel Postgres intermittently fail with unpredictable results and no clear error messages, even though the same SQL queries work reliably when run directly in the database.

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.

Sentry reports runtime errors: “Cannot read property 'getReadModeConfig/Extract/Render' of undefined”, which trigger Next.js error handling and break the site during static page rendering.

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.

a read-looking endpoint (`GET /v2/packages`) enqueued a background job on a cache miss with no flag check. Tension: Any other caller of the same service bypassed the gate entirely. Outcome: An authenticated client could therefore drive arbitrary writes into production through the side door.

Vercel deployments fail with `ENOENT: no such file or directory, lstat '/vercel/path0/.next/server/app/(main)/(pages)/page_client-reference-manifest.js'` during/after the build logs.

readfile('/private/something.jpg') doesn't work for displaying files from a non-public storage folder

Heroku deployment of a Django 4.2 app fails with an application error and logs show django.core.exceptions.ImproperlyConfigured: STATICFILES_STORAGE/STORAGES are mutually exclusive.

After deploying a Django site to Vercel (with Whitenoise), static files (e.g., CSS/JS/images) are not loaded correctly and the page shows an error related to static assets not being served.

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