Vercel cli with tokens

Vercel CLI with Tokens

Deploy and manage projects on Vercel using the CLI with token-based authentication, without relying on vercel login.

Step 1: Locate the Vercel Token

Before running any Vercel CLI commands, identify where the token is coming from. Work through these scenarios in order:

A) VERCEL_TOKEN is already set in the environment

printenv VERCEL_TOKEN

If this returns a value, you're ready. Skip to Step 2.

B) Token is in a .env file under VERCEL_TOKEN

grep '^VERCEL_TOKEN=' .env 2>/dev/null

If found, export it:

export VERCEL_TOKEN=$(grep '^VERCEL_TOKEN=' .env | cut -d= -f2-)

C) Token is in a .env file under a different name

Look for any variable that looks like a Vercel token (Vercel tokens typically start with vca_):

grep -i 'vercel' .env 2>/dev/null

Inspect the output to identify which variable holds the token, then export it as VERCEL_TOKEN:

export VERCEL_TOKEN=$(grep '^<VARIABLE_NAME>=' .env | cut -d= -f2-)

D) No token found — ask the user

If none of the above yield a token, ask the user to provide one. They can create a Vercel access token at vercel.com/account/tokens.

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Important: Once VERCEL_TOKEN is exported as an environment variable, the Vercel CLI reads it natively — do not pass it as a --token flag. Putting secrets in command-line arguments exposes them in shell history and process listings.

# Bad — token visible in shell history and process listings
vercel deploy --token "vca_abc123"

# Good — CLI reads VERCEL_TOKEN from the environment
export VERCEL_TOKEN="vca_abc123"
vercel deploy

Step 2: Locate the Project and Team

# Check environment
printenv VERCEL_PROJECT_ID
printenv VERCEL_ORG_ID

# Or check .env
grep -i 'vercel' .env 2>/dev/null

If you have a project URL (e.g. https://vercel.com/my-team/my-project), extract the team slug:

echo "$PROJECT_URL" | sed 's|https://vercel.com/||' | cut -d/ -f1

If you have both VERCEL_ORG_ID and VERCEL_PROJECT_ID in your environment, export them — the CLI will use these automatically:

export VERCEL_ORG_ID="<org-id>"
export VERCEL_PROJECT_ID="<project-id>"

Note: VERCEL_ORG_ID and VERCEL_PROJECT_ID must be set together — setting only one causes an error.

CLI Setup

Ensure the Vercel CLI is installed and up to date:

npm install -g vercel
vercel --version

Deploying a Project

Always deploy as preview unless the user explicitly requests production.

Quick Deploy (have project ID — no linking needed)

vercel deploy -y --no-wait
vercel deploy --scope <team-slug> -y --no-wait
vercel deploy --prod --scope <team-slug> -y --no-wait  # production only if explicitly requested

Check status:

vercel inspect <deployment-url>

Full Deploy Flow (no project ID — need to link)

# Check git remote and link state
git remote get-url origin 2>/dev/null
cat .vercel/project.json 2>/dev/null || cat .vercel/repo.json 2>/dev/null

# Link with git remote (preferred)
vercel link --repo --scope <team-slug> -y

# Link without git remote
vercel link --scope <team-slug> -y

# Link to specific project
vercel link --project <project-name> --scope <team-slug> -y

Then deploy via git push (if remote exists) or vercel deploy -y --no-wait.

Managing Environment Variables

# Set for all environments
echo "value" | vercel env add VAR_NAME --scope <team-slug>

# Set for a specific environment (production, preview, development)
echo "value" | vercel env add VAR_NAME production --scope <team-slug>

# List environment variables
vercel env ls --scope <team-slug>

# Pull env vars to local .env.local file
vercel env pull --scope <team-slug>

# Remove a variable
vercel env rm VAR_NAME --scope <team-slug> -y

Inspecting Deployments

# List recent deployments
vercel ls --format json --scope <team-slug>

# Inspect a specific deployment
vercel inspect <deployment-url>

# View build logs (requires Vercel CLI v35+)
vercel inspect <deployment-url> --logs

# View runtime request logs
vercel logs <deployment-url>

Working Agreement

• Never pass VERCEL_TOKEN as a --token flag. Export it as an environment variable and let the CLI read it natively.
• Check the environment for tokens before asking the user. Look in the current env and .env files first.
• Default to preview deployments. Only deploy to production when explicitly asked.
• Ask before pushing to git. Never push commits without the user's approval.
• Do not modify .vercel/ files directly. The CLI manages this directory. Reading them is fine.
• Do not curl/fetch deployed URLs to verify. Just return the link to the user.
• Use --format json when structured output will help with follow-up steps.
• Use -y on commands that prompt for confirmation to avoid interactive blocking.

Troubleshooting

Token not found

printenv | grep -i vercel
grep -i vercel .env 2>/dev/null

Authentication error

If the CLI fails with Authentication required:

• The token may be expired or invalid.
• Verify: vercel whoami (uses VERCEL_TOKEN from environment).
• Ask the user for a fresh token.

Wrong team

vercel whoami --scope <team-slug>

Build failure

vercel inspect <deployment-url> --logs

Common causes:

• Missing dependencies — ensure package.json is complete and committed.
• Missing environment variables — add with vercel env add.
• Framework misconfiguration — check vercel.json.

CLI not installed

npm install -g vercel