The build step will result in an error if the output directory is missing, empty, or invalid (for example, it is not a directory). To resolve this error, you can try the following steps:
- Make sure the output directory is specified correctly in project settings
- If the output directory is correct, check the build command (documentation) or the root directory)
- Try running the build command locally and make sure that the files are correctly generated in the specified output directory
Suppose your project contains a
package.json file, no
api directory, and no
vercel.json configuration. In that case, it is expected to provide a
build script that performs a static build of your frontend and outputs it to a
public directory at the root of your project.
When properly configured, your
package.json file would look similar to this:
"build": "[my-framework] build --output public"
Once you have defined the
build script, this error will disappear. Furthermore, it will not be displayed if you are using
package.json purely to provide dependencies for your Serverless Functions located inside the
The maximum amount of open requests to join a team is 10. In order to allow for more requests, the existing requests need to be approved or declined by a Team Owner.
This ensures the list always remains manageable and protected against spam.
If a user has already requested access to a team, it's impossible to invite them. Instead, their request must be approved by a Team Owner for the user to gain access.
This ensures no team invites are accidentally accepted.
When the deployment for a commit fails with the message "Team access required to deploy.", the Git account of the commit author is not connected to a Hobby account that is a member of the team.
The link attached to the error allows someone to connect their Hobby account to the Git account of the commit author. If the Hobby account is connected to a different Git account, it will fail stating that a different Git account must be used to request access to the team.
Once the Git account is connected to the Hobby account on Vercel, it is possible to request access to the team. A Team Owner can then approve or decline this access request. If the request was approved, the failed commit would be retried, and the following commits would not fail due to missing team access.
Blocked Hobby accounts or teams cannot create new deployments, or be invited to new teams. Please contact Vercel Support if you need help.
A Project has several settings that can be found in the dashboard. One of those sections, Build & Development Settings, is used to change the way a Project is built.
However, the Build & Development Settings are only applied to zero-configuration deployments.
If a deployment defines the
builds configuration property, the Build & Development Settings are ignored.
If a deployment defines the
regions configuration property in
vercel.json, the Serverless Function Region setting is ignored.
If a CLI Deployment defines the
--regions option, the Serverless Function Region setting is ignored.
source property follows the syntax from path-to-regexp, not the
For example, negative lookaheads must be wrapped in a group.
source property follows the syntax from path-to-regexp.
A colon (
:) defines the start of a named segment parameter.
A named segment parameter defined in the
destination property must also be defined in the
When running the
vercel build or
vercel dev commands,
npm install errors can be encountered if
npm was invoked to install Builders that are defined in your
npm install may fail if:
npmis not installed
- Your internet connection is unavailable
- The Builder that is defined in your configuration is not published to the npm registry
Double-check that the name and version of the Builder you are requesting is correct.
This is a necessary limitation because
routes is a lower-level primitive that contains all of the other types. Therefore, it cannot be merged safely with the new properties.
See the Upgrading Routes section for examples of
routes compared to the new properties.
For backward compatibility purposes, there are two naming conventions for configuration files used by Vercel CLI (for example
now.json). Both naming conventions are supported, however only one may be defined at a time. Vercel CLI will output an error message if both naming conventions are used at the same time.
These conflicting configuration errors occur if:
now.jsonexist in your project.
Solution: Delete the
.nowdirectories exist in your project.
Solution: Delete the
.nowignorefiles exist in your project.
Solution: Delete the
- Environment Variables that begin with
VERCEL_have a conflicting Environment Variable that begins with
Solution: Only define the
VERCEL_prefixed Environment Variable
For most cases, it is recommended to use the
functions property because it supports more features, such as:
- Allows configuration of the amount of memory that the Serverless Function is provided with
- More reliable because it requires a specific npm package version for the
- Supports "clean URLs" by default, which means that the Serverless Functions are automatically accessible without their file extension in the URL
builds property will remain supported for backward compatibility purposes.
When using Next.js, only
maxDuration can be configured within the functions property. Next.js automatically handles the other configuration values for you.
It's possible to deploy Serverless Functions to multiple regions. This functionality is only available to Enterprise teams.
On the Pro plan, the limitation has existed since the launch of the current pricing model but was applied on July 10, 2020. For Projects created on or after the date, it's no longer possible to deploy to multiple regions.
To select the region closest to you, read our guide on choosing deployment regions for Serverless Functions.
The functions property uses a glob pattern for each key. This pattern must match Serverless Function source files within the
If you are using Next.js, Serverless Functions source files can be created in the following:
pagesdirectory when the module exports getServerSideProps
src/pagesdirectory when the module exports getServerSideProps
Additionally, if you'd like to use a Serverless Function that isn't written with Node.js, and in combination with Next.js, you can place it in the
api directory (provided by the platform), since
If the Project configuration in
.vercel belongs to a team you are not a member of, attempting to deploy the project will result in an error.
This can occur if you clone a Git repository that includes the
.vercel directory, or you are logged in to the wrong Vercel account.
To fix, remove the
.vercel directory and redeploy to link the project again by running these commands.
On macOS and Linux:
rm -rf .vercel
rmdir /s /q .vercel
Project names can only consist of up to one hundred alphanumeric lowercase characters. Hyphens can be used in between words in the name, but never at the start or end.
The amount of Vercel Projects that can be connected with the same Git repository is limited depending on your plan.
If you have reached the limitation and would like to connect a new project to the repository, you will need to disconnect an existing project from the same Git repository.
To increase this limit, please contact our Sales Team.
To verify your domain, point the domain to Vercel by configuring our nameservers or a DNS Record. You can learn more about what to do for your Domain by running
vercel domains inspect <domain>, where
<domain> is the domain you're interested in.
Alternatively, if you already added the domain to a project, read the configuring a domain section of the custom domain documentation.
If you are the only remaining Member, you should instead delete the Team.
Deployments created using Vercel CLI will automatically ignore several files for security and performance reasons.
However, these files are not ignored for deployments created using Git and a warning is printed instead. This is because
.gitignore determines which files should be ignored.
If the file was intentionally committed to Git, you can ignore the warning.
If the file was accidentally committed to Git, you can remove it using the following commands:
git rm file.txt # remove the file
echo 'file.txt' >> .gitignore # append file to .gitignore
git add .gitignore # stage the change
git commit -m "Removed file.txt" # commit the change
git push # deploy the change
In some cases, signing up with GitHub fails due to GitHub's database inconsistencies.
When you connected your Hobby account with your GitHub account, the Vercel GitHub App was installed on your GitHub account and then GitHub notified Vercel that the app was successfully installed.
However, Vercel was unable to retrieve the app installation from GitHub, which made it appear as if the Vercel GitHub App was never installed.
In order to solve this issue, wait a couple of minutes and try connecting to GitHub again. If you are still unable to connect, please contact GitHub Support to determine why the Vercel GitHub App was not able to be installed.
If you have configured a custom Git branch for a domain or an environment variable, it is considered a preview domain and a preview environment variable. Because of this, the Git branch configured for it is considered a preview branch.
When configuring the production branch in the project settings, it is not possible to use a preview branch.
If you still want to use this particular Git branch as a production branch, please follow these steps:
- Assign your affected domains to the production environment (clear out the Git branch you've defined for them)
- Assign your affected environment variables to the production environment (clear out the Git branch you've defined for them)
Afterwards, you can use the Git branch you originally wanted to use as a production branch.
In order for Vercel to be able to deploy commits to your Git repository, a Project on Vercel has to be connected to it.
This connection is interrupted if the Git repository is deleted, archived, or if the Vercel App was uninstalled from the corresponding Git account or Git organization. Make sure none of these things apply.
Additionally, when using GitHub, the connection is also interrupted if you or a Team Member modifies the access permissions of the Vercel GitHub App installed on the respective personal GitHub account or GitHub organization.
To verify the access permissions of the Vercel GitHub App installed on your personal GitHub account, navigate to the Applications page and select Vercel under Installed GitHub Apps. You will see a list of Git repositories that the GitHub App has access to. Make sure that the Git repository you're looking to connect to a Vercel Project is listed there.
To verify the access permissions of the Vercel GitHub App installed on your GitHub organization, select Vercel under Installed GitHub Apps in the organization settings. You will see a list of Git repositories that the GitHub App has access to. Make sure that the Git repository you're looking to connect to a Vercel Project is listed there.
You cannot redeploy a production deployment if a more recent one exists.
The reason is that redeploying an old production deployment would result in overwriting the most recent source code you have deployed to production.
To force an explicit overwrite of the current production deployment, select Promote instead.
Certain SSL Certificates associated with your Hobby account or team (i.e. Wildcard SSL Certificates for your Vercel Project's staging domains) are automatically generated by the Vercel platform.
Because these SSL Certificates are managed by the Vercel platform, they cannot be manually deleted on the Vercel Dashboard – nor through Vercel CLI.
Custom SSL Certificates may be uploaded to teams on the Enteprise plan, which are allowed to be manually deleted.
The Git branch that is configured using the production branch field in the project settings, is considered the branch that contains the code served to your visitors.
If you'd like to assign a domain or environment variable to that particular Git branch, there's no need to manually fill it in.
By default, if no custom Git branch is defined for them, domains are already assigned to the production branch. The same is true for environment variables: If no custom Git branch is defined for them and Production is selected as an environment, they're already assigned to the production branch.
If you still want to enter a specific Git branch for a domain or an environment variable, it has to be a preview branch.
The "Command not found" error message happens when a sub-process that
vercel dev is attempting to create is not installed on your local machine. You need to install the particular program onto your operating system before
vercel dev will work correctly.
For example, you may see the error "Command not found: go" if you are writing a Serverless Function in Go, but do not have the
go binary installed. In this case you need to install
go first, and then try invoking your Serverless Function again.
You have configured one of the following for your Project:
- The Build Command defined in the Project Settings invokes
- The Development Command defined in the Project Settings invokes
Because the Build Command is invoked by
vercel build when deploying, it cannot invoke
vercel build itself, as that would cause an infinite recursion.
The same applies to the Development Command: When developing locally,
vercel dev invokes the Development Command, so it cannot invoke
vercel dev itself.
Adjust the Build and Development Commands defined for your Project to not invoke
vercel build or
Instead, they should invoke the Build Command provided by your framework.
If you are unsure about which value to provide, disable the Override option in order to default to the preferred settings for the Framework Preset you have selected.
This error occurs when attempting to create a deployment where at least one of its environment variables contains an outdated Edge Config connection string. A connection string can be outdated if either the Edge Config itself was deleted or if the token used in the connection string is invalid or has been deleted.
To resolve this error, delete or update the environment variable that contains the connection string. In most cases, the environment variable is named
You must reference
@vercel/analytics packages in your application's
package.json file. This error occurs when you deploy your application with these packages globally available, but not referenced in your
package.json file, like in a monorepo.
To fix this error, add the packages to your
package.json file as a dependency.