Category
Developer Tools
JSON, UUID, Base64, and password utilities for everyday engineering—100% in the browser for configs, APIs, and debugging.
Privacy-first debugging
Paste API responses or config JSON locally—no upload to a server. Ideal for quick fixes on flights, client machines, or locked-down networks.
Common tasks
Prettify JSON for logs, minify for payloads, generate UUID v4 keys, encode/decode Base64, test cron expressions, regex patterns, and Unix timestamps, and create strong passwords for staging environments.
Security note
Avoid pasting production secrets on shared computers. Passwords are generated in-browser; copy into your password manager and clear the page when done.
Tools in this category
JSON Formatter
Validate, prettify, and minify JSON locally.
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UUID Generator
Generate RFC 4122 UUID v4 identifiers.
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Base64 Encode / Decode
Encode text to Base64 or decode Base64 safely in the browser.
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Password Generator
Create strong random passwords in your browser.
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QR Code Generator
Create QR codes for URLs, WiFi, email, and text—download PNG.
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Hash Generator
Compute MD5, SHA-256, and SHA-512 hashes in the browser.
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JWT Decoder
Decode JWT header and payload without sending tokens to a server.
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URL Encode / Decode
Encode or decode URLs and query strings safely.
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SQL Formatter
Beautify and minify SQL for readability.
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CSV to JSON Converter
Convert CSV to JSON and JSON arrays back to CSV.
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Markdown Preview
Live Markdown preview with instant HTML rendering.
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Cron Expression Parser
Parse cron expressions and show upcoming run times.
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Regex Tester
Test regular expressions with flags and sample text.
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Unix Timestamp Converter
Convert Unix timestamps to ISO dates and back.
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FAQ
Does the JSON formatter fix invalid JSON?
It validates and can attempt repair for common issues. Always review output before deploying config.
Are UUIDs cryptographically random?
We use the browser crypto API where available (RFC 4122 v4 style).
Where are passwords stored?
Nowhere on our side—they exist only in your tab until you refresh.