Practical tutorials, guides, and deep dives on the tools and technologies developers use every day. Written by developers, for developers.
Learn how to format, validate, and debug JSON effectively. Best practices for working with API responses, config files, and nested objects in your development workflow.
Read article →Everything you need to know about JSON Web Tokens — how they work, their structure, security considerations, and how to decode and debug them safely.
Read article →A practical guide to Base64 encoding — what it is, how it works, common use cases like data URIs and API authentication, and why it is not encryption.
Read article →Master Unix timestamps — convert between formats, handle timezones, avoid the seconds vs milliseconds trap, and debug time-related issues in any language.
Read article →Learn regular expressions from scratch. Covers regex syntax, character classes, quantifiers, capture groups, common patterns, and best practices for maintainable regex.
Read article →The DevToolBelt blog is your go-to resource for practical developer knowledge. We write in-depth articles about the data formats, encoding schemes, authentication mechanisms, and development tools that web developers work with every day.
Each article is written to be genuinely useful — not just surface-level overviews, but deep dives with real examples, common pitfalls to avoid, and actionable best practices. Whether you are a junior developer learning the fundamentals or a senior engineer looking for a quick reference, our articles are designed to save you time and help you write better code.
Topics we cover include JSON formatting and validation, JWT authentication and security, Base64 encoding and its applications, Unix timestamps and timezone handling, regular expressions and pattern matching, password security, hashing algorithms, and more. We also write about AI-related topics like prompt engineering, token counting, and API cost optimization.
All code examples in our articles work with our free online developer tools, so you can practice and experiment as you learn. Every tool runs in your browser with no sign-up required.