Testnizer
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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.

The full capability surface of Testnizer, grouped by area. Everything below runs 100% locally — no account, no cloud, no telemetry. For deeper pages, follow the links in each section.

Protocols

Every protocol is a first-class request type with its own editor, response panel, and Node-side engine — not a plugin. See Protocols overview.

ProtocolHighlights
HTTP / RESTMethods, body modes, redirects, timeout, mTLS, scripts, assertions
SOAP / WSDLWSDL import, manual envelope, operation picker
WS-SecurityUsernameToken, Timestamp, RSA-SHA256 signing, encryption — see WS-Security
GraphQLQuery, mutation, subscription, schema introspection
gRPCProto load + server reflection, all four streaming modes
WebSocketwss, custom headers, JSON composer, bidirectional timeline
Socket.IONamespaces, auth.token, emit + subscribe, event timeline
SSELong-lived streams, named events, Last-Event-ID resume
MCPStreamable HTTP / SSE / stdio; list + invoke tools
AI ChatMultiple LLM providers + custom URL, streaming, tools bridge

Building requests

  • Method + URL bar with live query-param ↔ URL sync
  • Headers with bulk edit
  • Body modes: raw / JSON / XML / HTML / text, form-data (file upload), x-www-form-urlencoded, binary
  • Per-request timeout, redirect following (max redirects), SSL verification toggle
  • Pre-request and post-response script tabs

Authentication

Basic · Bearer Token · API Key (header or query) · OAuth2 · Digest · NTLM · Hawk · AWS Signature.

Variables & environments

See Environments & variables.

  • Environments scoped per project, with a dual Initial / Current Value model
  • Global variables at workspace and project scope
  • {{variable}} substitution with chained references
  • Dynamic values: {{$randomInt}}, {{$guid}}, {{$timestamp}} and more
  • Inline variable autocomplete

Testing & assertions

Code-free assertions: status equals, status in range, body contains, header exists / equals / contains, response time under, response size under. Assertion values themselves resolve {{variables}}. See Scripts & test assertions.

Scripting

Postman / Insomnia-compatible pm.* API in a sandboxed runtime:

  • pm.environment / pm.globals / pm.variables / pm.collectionVariables get & set
  • pm.test(), pm.expect() (chai-BDD chain), pm.response
  • pm.iterationData, pm.execution.skipRequest() / setNextRequest()

Running collections

See Collection runner & automation.

  • Sequential multi-request runs, iterations + data-driven rows (CSV / JSON)
  • Delay between requests, stop-on-error, environment selection
  • HTML & JSON reports, run history + statistics
  • Scheduler for recurring runs
  • Right-click Run on any folder or collection
  • Test Suites — sets built from multiple collections, each item a full request snapshot

Mock server

Local rule-based HTTP mock server with {{variable}} templating, conditional rules, scripted responses, auth, rate limiting, failure injection, and schema validation. See Mock Server.

Import & export

See Import & export.

  • Import: OpenAPI / Swagger, Postman, Insomnia, HAR, cURL, WSDL, RAML, SoapUI, Testnizer Native — with auto format detection
  • Export: full project or folder subtree, lossless round-trip

Code generation

Generate a ready-to-paste request snippet in cURL, JavaScript (fetch / axios), Python (requests), Java (OkHttp), C#, Go, PHP, Ruby, Kotlin, and Swift.

Built-in tools

Offline, browser-safe utilities — see Built-in tools and the JWT Debugger:

JWT · JSONPath · XPath · XSLT · Hash · HMAC · Encoders (Base64 / URL) · Base converter · Regex tester · Diff · Epoch / timestamp · UUID generator · JSON ↔ XML · YAML ↔ JSON · Jolt transform · JSON Schema · JSON / XML formatter · HTTP status reference · WS-Security helper.

Organization & version control

  • Workspaces → Projects → Branches hierarchy
  • Git integration (per-project branches, conflict handling) — see Git integration
  • Endpoint / folder tree with drag-and-drop ordering

Request history

Local request history with full request/response snapshots, “Today” grouping, and a detail panel. See Request history.

Response viewing

  • Status / timing / size metadata, Monaco JSON syntax highlighting
  • Response · Cookies · Headers · Console · Actual Request tabs
  • Timing breakdown (DNS / TCP / TLS / TTFB / download)

Certificates & TLS

mTLS / client certificates, TLS presets, Legacy TLS routing for old servers, custom truststore, and encrypted passphrase storage. See Certificates.

Security & privacy

  • Optional password protection for local data
  • EULA / privacy consent on first run
  • contextIsolation on, nodeIntegration off, strict CSP — the UI never touches the network directly; all traffic goes through the Node main process
  • URL credential scrubbing in history. See Why offline?.

Platform

  • Windows, macOS, Linux (x64 + arm64)
  • Standalone & 100% offline — zero external dependencies
  • Local SQLite storage, encrypted config
  • Auto-update built in
  • Native open / save / message dialogs