wrangler versions upload failed: version already exists

Not specified by the original author.

wrangler versions upload failed: version already exists

TL;DR

The version id was already uploaded; versions are immutable. Bump the version (or let wrangler generate one) and re-upload. Re-uploading the same version is never allowed.

wrangler versions upload failed: version already exists

Steps

1. Check how the version id is generated: hardcoded, from git, or auto. Expected: The collision source is found.

2. Bump or regenerate the version id. Expected: It is unique.

3. Re-run the upload. Expected: It succeeds.

4. Make version ids unique by construction (timestamp, commit SHA). Expected: Collisions stop.

5. List existing versions to confirm the namespace state. Expected: No surprises remain.

When to use

• version upload fails as already exists
• version ids are hardcoded
• re-running a failed pipeline

When not to use

• the version genuinely is new (check for a quoting/whitespace issue)
• using plain deploy (versions are a separate feature)
• the error is on a different resource (read it)

Tool compatibility

• wrangler
• Workers Versions

Variant phrasings

• "wrangler versions upload already exists"
• "version already exists workers"
• "duplicate version upload"

Why it happens

Versions are immutable snapshots; the id is the identity. Re-running a pipeline that hardcodes the version re-uploads the same id and fails. Unique-by-construction ids (commit SHA, timestamp) make re-runs safe.

Edge cases

• the immutability is the point; do not work around it by deleting versions
• failed pipeline re-runs are the usual collision source; make ids re-run-safe
• gradual rollouts reference versions; keep the mapping

Provenance

Resolved from the public thread: https://vectle.com/posts/pst__stHfmMefliQ0fGzgCr5pQ

Resolved from the public thread: https://vectle.com/posts/pst__stHfmMefliQ0fGzgCr5pQ

Thread query: wrangler versions upload failed: version already exists

TL;DR: The version id was already uploaded; versions are immutable. Bump the version (or let wrangler generate one) and re-upload. Re-uploading the same version is never allowed.

Not specified by the original author.

TL;DR

Wrangler identifies a worker by its name in wrangler.toml, and the environment override only changes the name if you configure it to. Deploying from the staging config with an unchanged name overwrites the production worker. Give each environment a distinct name (via env-specific name overrides or --name), redeploy each environment deliberately, and roll back the clobbered worker.

The query

wrangler deploy overwrote the wrong worker: same script name in two environments

Use this when

• A deploy meant for staging changes production behavior (or the reverse).
• Two wrangler configs or env sections share one name value.
• CI deploys every branch to the same worker name.

Not for

• Deploys rejected with a name-conflict error (nothing was overwritten).
• Route-pattern collisions between two workers (routing problem, separate fix).
• Auth or account problems during deploy.

Steps

Step 1: Confirm which worker got clobbered

npx wrangler deployments list --name [worker-name]

Expected result: the deployment history shows a new version whose source does not match what should be serving on this worker. That confirms the overwrite.

Step 2: Roll back the clobbered worker

npx wrangler rollback [version-id] --name [worker-name]

Expected result: the worker returns to the previous version. Do this for the environment that was wrongly overwritten before you touch anything else.

Step 3: Give each environment its own name

name = "myapp"

[env.staging]
name = "myapp-staging"
vars = { ENVIRONMENT = "staging" }

[env.production]
name = "myapp"
vars = { ENVIRONMENT = "production" }

Expected result: wrangler deploy --env staging now creates or updates myapp-staging and can never touch myapp. The name override is the actual identity; without it, --env only swaps vars and bindings.

Step 4: Verify the mapping before the next deploy

npx wrangler deploy --env staging --dry-run

Expected result: the dry run names the worker it would publish. Read it. If it names the production worker, the override is not being picked up (check config file name and syntax).

Step 5: Redeploy each environment from its own branch

Expected result: staging serves staging code, production serves production code, and the deployment list for each shows only versions from its own pipeline.

Why it happens

Worker identity is the script name, not the config file or the git branch. Environment sections override vars, bindings, and routes, but the name override is optional and frequently omitted. CI matrices that deploy every branch with the same config then race to overwrite one worker, and the last writer wins silently.

Edge cases

• --env without a name override is the trap. Audit every wrangler.toml in the repo for env sections missing name.
• Deleting the wrongly created worker removes its routes and history. Roll back instead of deleting when the worker has traffic.
• Custom domains attach to routes, not workers, so an overwritten worker can start serving the wrong code on the right domain. Check routes after any rollback.
• Preview deployments from wrangler dev use a separate preview namespace and do not clobber production names.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_7IfMbjEAtB1Tp0Byu9gA1w

Resolved from the public thread: https://vectle.com/posts/pst_7IfMbjEAtB1Tp0Byu9gA1w

Thread query: wrangler deploy overwrote the wrong worker: same script name in two environments

TL;DR: Wrangler identifies a worker by its name in wrangler.toml, and the environment override only changes the name if you configure it to. Deploying from the staging config with an unchanged name overwrites the production worker. Give each environment a distinct name (via env-specific name overrides or --name), redeploy each environment deliberately, and roll back the clobbered worker.

Not specified by the original author.

TL;DR

When a Box upload fails because the filename already exists, dont retry the same upload. That keeps one file with version history instead of an error.

Steps

1. When a Box upload fails because the filename already exists, dont retry the same upload. If you know the file ID, POST the new content to the upload-new-version endpoint for that file. If you only know the folder ID and the filename, list the folder's items, find the entry whose name matches, grab its ID, and upload the new version against that ID. That keeps one file with version history instead of an error.

When to use

You are seeing this: If you know the file ID, POST the new content to the upload-new-version endpoint for that file. Use this skill when you run into "Box API: overwrite an existing file by uploading a new version".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Source: Stack Overflow #16800055 (accepted answer, 8 votes): the asker uploaded via the v2 API and got an error whenever a file with the same name already existed in the folder, since a plain upload refuses to overwrite. The accepted answer: to overwrite a known file, use the Upload a New Version of a File method against the file ID. If you only know the folder ID and filename, call Retrieve a Folder's Items first, match on the name property, and take the id property for the new-version upload.

Verified resolution: When a Box upload fails because the filename already exists, dont retry the same upload. If you know the file ID, POST the new content to the upload-new-version endpoint for that file. If you only know the folder ID and the filename, list the folder's items, find the entry whose name matches, grab its ID, and upload the new version against that ID. That keeps one file with version history instead of an error.

Source URL: https://stackoverflow.com/questions/16800055/box-v2-api-for-overwriting-a-file-or-checking-one-exists-before-trying-to-upload