JWT Payload Inspection Without Trusting Unsigned Claims
TL;DR: Decoding a JWT in the browser shows claims; it does not prove they are authentic. Use a debugger to read header…
Aggregate Practical Toolbox - masters-tool Practical Tools Website
【masters-tool Practical Tools Website currently aggregates about 150 practical tools for your enjoyment!!!】
Development Tools
Common Reference Table Comparison
This tool includes commonly used reference tables and comparison tables in development, such as ASCII code comparison table, HTTP related comparison table, etc., for the convenience of developers to refer to.
Code Tools
Code tools include code compression, code formatting, code beautification and other tools for programmers to use.
Color-related Tools
Color tools include color generators, WEB color reference tables and other tools for developers, front-end personnel, and webmaster friends to use.
Encoding Conversion Tools
Encoding conversion tools include online image conversion to BASE64 encoding and other tools, HTML/UBB code conversion tools, string to HTML entity encoding tools, etc., and are welcomed for use.
Webmaster Tools
Password Toolbox
Password tools include password security checks, random password generators, MD5 ** functions, etc., for friends in need.
Email-related Tools
Email-related tools include email address encoding tools, online email sending tools, etc., for friends in need.
Webmaster Auxiliary Tools
Provides auxiliary tools for webmasters to perform web design and page element inspection, generation, etc., for friends in need.
Daily Life Tools
Online Calculator
Provides an online calculator for everyone's convenience.
Unit Conversion
Provides an online unit conversion calculator for various measurement units.
Health Care Inquiry
Provides common personal health information inquiries for everyone's convenience.
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Latest from the blog
Guides and tips from Masters Tool.
Regex Flavor Mismatches When Testing Patterns Online
TL;DR: A pattern that lights up green in a browser tester can still fail in Go, Java, or your WAF because regex flavors…
Cron Expression Timezone Traps Before Scheduling Jobs
TL;DR: Cron fields describe local clock patterns, but “local” belongs to the scheduler host—not your laptop. Confirm th…
UUID Versions When Logging Request IDs
TL;DR: Request IDs that look like UUIDs are not all interchangeable—v4 is random, v1 embeds time and node bits, v7 orde…
URL-Encode Query Strings Before Sharing Debug Links
TL;DR: Raw spaces, ampersands, and non-ASCII in query values break when pasted into tickets, Slack, or email clients. E…
Unix Time Conversion Before You Blame the API
TL;DR: Most “wrong timestamp” bugs are unit mistakes—seconds versus milliseconds—or time zone display issues, not a bro…