QA Dev Toolkit
Free Tools for QA Engineers
11 browser-based utilities that run entirely client-side. No signup, no server calls, no data leaving your machine.
JSON Formatter
Format, validate & minify
Beautify or minify JSON instantly. Validates syntax and pinpoints errors with line numbers.
API Response Viewer
Explore JSON tree & raw
Paste any API response and explore it as a collapsible tree or raw view. Search within large payloads.
Regex Tester
Live match highlighting
Write a regex and see matches highlighted in real time. Supports all JavaScript flags (g, i, m, s, u).
JWT Decoder
Inspect token claims & expiry
Decode JWT header and payload claims. Check expiry, issuer, subject, and all standard claims instantly.
Base64 Encoder
Encode & decode Base64
Encode text or files to Base64 and decode Base64 strings back to plain text. Standard and URL-safe variants.
CSV ↔ JSON
Bidirectional conversion
Convert CSV to JSON and JSON to CSV. Supports comma, semicolon, tab, and pipe delimiters.
Diff Checker
Compare two texts side by side
See exactly what changed between two blocks of text. Line-by-line with added/removed/unchanged counts.
UUID Generator
Bulk UUID v4 generation
Generate up to 500 UUID v4 values. Multiple formats: standard, no-hyphens, uppercase, braces.
Timestamp Converter
Unix ↔ ISO ↔ human date
Convert Unix timestamps to readable dates and vice versa. Timezone support, live clock mode.
Test Data Generator
Generate realistic fake data
Generate names, emails, phone numbers, addresses, and more. Export as CSV or JSON — up to 1,000 rows.
Coverage Calculator
Measure test coverage %
Calculate requirement coverage, pass rate, defect density, and blocker ratio with visual gauges.
Why browser-based QA tools?
Every tool runs entirely inside your browser. No backend server, no database, no network request with your data — ideal for enterprise environments where copying tokens, API responses, or credentials to third-party servers is prohibited.
Built with Next.js for speed. Each tool has its own URL so you can bookmark and share individual tools with your team.