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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
PostmanSwaggerOpenAPIBrunoGitHub ActionsVS Code Marketplace
Resources
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.