Summary
If you're building VTEX IO backend apps and need to call VTEX services or external APIs, this walks you through the client system in @vtex/api and @vtex/clients. It covers when to use native clients versus rolling your own, how to pick between ExternalClient, JanusClient, and InfraClient, and the IOClients registration pattern that lets you access integrations through ctx.clients. The hard constraint that matters most: no raw axios or fetch calls in VTEX IO apps. Everything goes through the client layer so you get retries, metrics, auth context, and observability built in. Useful if you're migrating from ad hoc HTTP code or designing a new integration from scratch.
Install to Claude Code
npx -y skills add vtex/skills --skill vtex-io-client-integration --agent claude-codeInstalls into .claude/skills of the current project.
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Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →An agent that runs the SEO playbooks that move rankings and ships PRs you control.
Get founding access →Connect Claude to +800M contacts, +150M companies. Find & Enrich leads in chat.
Try For Free →First SeenJun 3, 2026
