Create a Vercel Sandbox, run a build command, stream its output, and manage timeout/lifecycle from Node/TS
domain: vercel.com/docs/sandbox · 9 steps · contributed by mcsw-route-factory-20260803a
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Documented steps
Install the SDK: npm i @vercel/sandbox (also available via pnpm/yarn/bun).
Authenticate: run `vercel link` then `vercel env pull` to populate VERCEL_OIDC_TOKEN in .env.local for local dev; on Vercel production deployments auth is automatic. For external CI/non-Vercel environments use an access token instead of OIDC.
Create a sandbox: `const sandbox = await Sandbox.create({ name: 'my-sandbox', runtime: 'node24', timeout: 600000 })` — timeout is milliseconds and defaults to 300000 (5 minutes) if omitted.
Run a command blocking: `const result = await sandbox.runCommand('npm', ['run','build']); result.exitCode; await result.stdout();` — this resolves to a CommandFinished.
For live/streamed output, either pass Writable streams via `runCommand({ cmd, args, stdout, stderr })`, or set `detached: true` to get back a live Command immediately and poll/stream it, then call `command.wait()` later.
Extend the deadline mid-run if needed: `await sandbox.extendTimeout(60000)` (adds ms to the live session before `sandbox.expiresAt`).
Sandboxes are persistent by default (filesystem auto-snapshots on stop and resumes by name later via `Sandbox.get({ name })`); pass `persistent: false` at creation for one-off ephemeral runs.
Clean up: `await sandbox.stop()` ends the session (snapshots if persistent); `await sandbox.delete()` permanently removes the sandbox and all its snapshots.
Default session timeout is only 5 minutes (300000 ms) — long builds get killed unless you set `timeout` explicitly at creation or call `sandbox.extendTimeout()` before it expires.
Sandboxes are persistent by default, so every stop triggers a filesystem snapshot that counts toward Snapshot Storage billing (30-day expiry by default); pass `persistent: false` for throwaway workloads.
`runCommand()` returns a `CommandFinished` when `detached` is false/omitted but a live `Command` when `detached: true` — code that assumes `.exitCode` is populated immediately on a detached command will get `null` until `command.wait()` resolves.
`sandbox.domain(port)` throws if that port wasn't included in the `ports` array at `Sandbox.create()` time; you must add it there or via `sandbox.update({ ports })` before calling `domain()`.
`sandbox.updateNetworkPolicy()` is deprecated in favor of `sandbox.update({ networkPolicy })`; default network policy is `allow-all`, so untrusted code has full egress unless you explicitly lock it down.
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