Documentation
Guides, protocol references, and tool walkthroughs. Everything Testnizer can do, written down.
Getting started
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Getting started
Install Testnizer, send your first request, and find where your data actually lives.
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Why offline?
The compliance and operational reasons Testnizer enforces a strict offline execution model.
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Features
A complete reference of everything Testnizer does — protocols, auth, variables, testing, runner, mocking, import/export, code generation, and the built-in tools.
Guides
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Import & export
Bring your existing collections from Postman, Insomnia, OpenAPI, Swagger, cURL, WSDL, .proto, RAML, SoapUI, and HAR.
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Environments & variables
Project-scoped environments, variable substitution, dynamic values, and best practices for sharing collections without leaking secrets.
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Collection runner & automation
Run collections in sequence, generate HTML reports, schedule recurring runs, and automate from CI.
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Scripts and test assertions
Pre-request scripts, test scripts, the full pm API, built-in require() libraries, the legacy Postman interface, Insomnia/Bruno aliases, and built-in OAuth 2.0 for Testnizer.
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Certificates
Add client certificates for mTLS and custom CA certificates for self-signed servers.
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Variables reference
Complete reference for variable types, scope hierarchy, and dynamic value functions in Testnizer.
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Git integration
Branch collections per feature, review API changes in pull requests, and keep credentials out of git history.
Protocols
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Protocols overview
Quick reference for HTTP, SOAP, WebSocket, GraphQL, gRPC, SSE, Socket.IO, MCP and AI Chat in Testnizer.
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HTTP / REST
Complete reference for HTTP requests in Testnizer — methods, auth, body modes, scripts, and assertions.
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WS-Security
Sign, encrypt, verify, and decrypt SOAP envelopes locally — no online tools.
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WebSocket
Connect, send, and receive WebSocket messages with Testnizer's full-featured WS editor.
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GraphQL
Run queries, mutations, and subscriptions with schema introspection and type-safe variable editors.
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gRPC
Load proto files, invoke all four streaming modes, and inspect metadata with Testnizer's native gRPC engine.
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SOAP
Parse WSDL files, generate envelopes automatically, and send SOAP 1.1 and 1.2 requests — all offline.
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SSE & AI Chat
Monitor Server-Sent Event streams and chat with 14 AI providers — both backed by Testnizer's local SSE engine.
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Socket.IO
Connect to Socket.IO servers, emit events with JSON payloads, subscribe to event names, and watch the bidirectional timeline.
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MCP (Model Context Protocol)
Testnizer is an MCP client. Connect to MCP servers over Streamable HTTP, SSE, or stdio; list and invoke tools.
Tools
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JWT Debugger
Decode, encode, verify, and inspect JSON Web Tokens entirely offline — no website, no network call.
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Built-in tools
Reference for the offline tools shipped with Testnizer — JWT debugger/encoder, formatters, encoders, diff, JSONPath, XPath, XSLT, Jolt, WS-Security, hash, HMAC, JSON Schema, JSON↔XML, epoch, HTTP status codes, base converter.
Reference
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Verifying releases
How to verify the integrity of downloaded Testnizer installers using SHA-256 checksums.
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Keyboard shortcuts
Default keyboard shortcuts for sending requests, managing tabs, navigating the sidebar, and opening tools.
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Frequently asked questions
Answers to common questions about offline usage, data storage, compatibility, licensing, and migration from Postman.
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Request history
Browse, replay, and export past requests from Testnizer's local history panel.
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Changelog
Release notes and version history for Testnizer.