Postmate Client is a free, privacy-first API client that runs natively inside VS Code. Test REST, GraphQL, and WebSocket APIs without leaving your editor — no account required, no cloud sync, no telemetry. All requests, environments, and data stay on your machine.

Every feature is included, free — there is no paid tier:

• REST, GraphQL, and WebSocket requests with variable autocomplete
• Collections and environments with instant switching
• Request chaining — pass values from one response into the next request without scripts
• Data-driven testing — attach a CSV data table to your environment and run a request against every row, or re-run a single row from a dropdown inside the request panel
• Compare API responses — diff two responses or two environments side by side, with differences shown in clean JSONPath notation; run bulk comparisons across a full data table for staging-vs-prod regression checks
• Tests and assertions — write them as table rows (no code) or in JavaScript with a Monaco editor
• Collection Runner with HTML reports
• CLI (pmc) for CI/CD pipelines — GitHub Actions, GitLab CI, Jenkins
• mTLS / client certificate support — certificates stay local, never uploaded
• One-click import from Postman (v2.0/v2.1), Bruno, Swagger/OpenAPI, and cURL

Postmate Client was built by a solo developer after Postman was blocked at his organization over data privacy concerns. It is designed for developers and teams in security-conscious environments — fintech, healthcare, enterprise — where API payloads, tokens, and certificates must never leave the machine.

Install from the VS Code Marketplace and send your first request in under a minute.

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