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92+ browser-based utilities
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{
"service": "orders",
"status": "ok",
"latencyMs": 182
}Featured tools
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API Request Builder
Build and send HTTP requests with headers, params, auth, and body directly in the browser.
API
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API Contract Tester
Validate OpenAPI contracts and catch missing request or response definitions before release.
API
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API Mock Server Generator
Draft mock endpoint shapes from schemas so teams can stand up test doubles faster.
API
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API Response Comparator
Compare two API payloads and inspect added, removed, and changed values side by side.
API
Open tool
QA favorite
API Scenario Builder
Chain API requests with shared variables, assertions, and step-by-step execution logs.
API
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Assertion Generator
Generate assertion snippets from API responses to speed up automated test authoring.
QA
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Base64 / JWT Playground
Encode and decode Base64 strings while inspecting JWT claims, headers, and expiry values.
Security
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Brotli Compressor / Decompressor
Compress or decompress text with Brotli to debug payload transport and fixture handling.
Encoding
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Bug Report Helper
Build structured bug reports with repro steps, environment notes, and expected versus actual output.
QA
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CI/CD Pipeline Visualizer
Parse pipeline definitions and visualize stages, jobs, and dependencies before merging changes.
DevOps
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Concurrency Simulator
Estimate concurrency pressure, utilization, and bottleneck risk from traffic and response-time inputs.
Performance
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Universal Converter
Convert JSON, YAML, XML, CSV, and plain text between common engineering formats.
Data
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Runs in your browser
No accounts, no installs, and no payload storage on KalpLabs for the standard tool set.
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API debugging, QA checks, config validation, and data transforms live in one place.
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