Postmate Client is unclaimed —

Postmate Client

Privacy-First Postman Alternative for VS Code·postmateclient.com

Postmate Client is a privacy-first REST, GraphQL, and WebSocket API client built natively into VS Code. It lets developers and QA engineers test APIs locally without cloud sync, login, or telemetry, and supports importing Postman, Swagger/OpenAPI, cURL, and Bruno collections. It includes data-driven testing with CSV data tables, request chaining, scripting, response comparison, and a CLI for CI/CD automation.

What it's for

Testing REST, GraphQL, and WebSocket APIs inside VS CodeImporting existing Postman, Swagger/OpenAPI, cURL, or Bruno collectionsRunning data-driven tests using CSV data tablesComparing API responses side-by-side or in bulk via CSVChaining requests to pass tokens and values between callsAutomating API tests in CI/CD pipelines via CLI or GitHub ActionsWriting pre/post-request scripts and plain-English test assertions

Features 22

Authentication support: Basic, Bearer, API Key, AWS Signature, OAuth 2.0 (Client Credentials, Password, Authorization Code with PKCE)
Bulk response comparison via CSV
CLI for CI/CD automation with JSON/HTML reports
Client certificate (mTLS) support
Collection Runner for sequential collection execution
Collections & Folders organization
Corporate proxy support
Data Tagging (_dtag column) for per-request row filtering
Data-driven testing with CSV Data Tables
Environments & Variables management
GraphQL query and mutation support with Variables editor
Import cURL commands
Import OpenAPI 3.0 and Swagger 2.0 specs
Import Postman v2.1 collections
Migrate from Bruno collections
Plain-English tabular test editor
Pre/post-request scripts via pm scripting library
Request Chaining between requests
REST API request builder
Secret variables stored in OS keychain
Side-by-side response comparison with JSONPath diff
WebSocket (ws:// and wss://) testing

At a glance

free tier

TypePlugin / add-on

DeploymentInstalled (local)

Fordevelopers, QA engineers

Integrations

VS Code MarketplaceOpenAPIGitHub ActionsBrunoSwaggerPostman

Resources

Docs

Pricing

The product states it is free forever with all features included and no paid tiers.

FreeFree

Postmate Client is free forever with no paid tiers, no team seats, and no login required.