Vercel has officially added the vercel curl command to its command-line interface (CLI) toolkit, allowing developers to quickly and securely test endpoints and deployed applications using standard curl syntax.
How it works
The new vercel curl command fully accepts all native curl URL formats and flags. The most critical improvement is the automatic integration of authentication. When running this command, the Vercel CLI uses the user's credentials to automatically bypass Deployment Protection without requiring manual header configuration. Additionally, for linked projects, users only need to pass a relative path instead of the entire URL.
Background
Previously, testing API routes in Vercel's staging environments was often challenging because security layers blocked anonymous access. Developers had to spend time manually retrieving authentication tokens and passing them into curl commands. Integrating this feature directly into the CLI streamlines the daily debugging workflow.
Why it matters
For software engineers using Vercel, this is a minor yet incredibly useful upgrade that boosts productivity. Being able to run a quick command to check server responses directly in the terminal—without worrying about being blocked by firewalls or authentication—makes the "dev-to-prod" development workflow much more seamless. Users just need to update the Vercel CLI to the latest version to try out this feature.