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KalpLabs
Free Developer & QA Utilities
92 tools for JSON, regex, JWT, YAML and more. No login, no ads, and everything runs in your browser.
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Featured tools
Universal Converter
Convert JSON, YAML, XML, CSV, and plain text between common engineering formats.
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New
CSV / JSON Converter
Convert CSV to JSON and JSON arrays to CSV with delimiter detection and nested-data handling.
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JSON Diff Checker
Compare JSON payloads and detect added, removed, and changed fields for regression testing.
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QA favorite
JSON Schema Validator
Validate JSON payloads against schemas and identify precise failing paths and types.
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JSON Test Case Generator
Generate QA-ready test scenarios from JSON payload structure and field combinations.
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New
JSON to Code Generator
Generate typed models from JSON for TypeScript, Python, Java, Go, C#, Kotlin, and Rust.
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Most used
JSON Utilities
Format, validate, diff, search, and query JSON payloads in one editor-first workspace.
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QA favorite
Load Test Result Analyzer
Analyze JMeter CSV and k6 JSON results for latency, throughput, and error patterns.
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Lorem JSON Generator
Generate realistic user, order, and product JSON payloads for mocks and fixtures.
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Trending
Random JSON Generator
Generate random nested JSON payloads to test parsers, validators, and API robustness.
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New
Webhook Payload Builder
Edit GitHub, Stripe, Slack, Jira, and PagerDuty webhook payload templates locally.
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XML to JSON Converter
Convert XML payloads into JSON output while preserving nested structure where possible.
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Why KalpLabs
Why developers choose KalpLabs
Instant
No unnecessary round-trips when you need a quick formatter, validator, or decoder.
Always Free
No paywalls, no hidden pro gates, and no login requirement for standard tools.
Works Anywhere
Open the site in any modern browser and keep working without an install step.