Developer Blog
Guides & Tutorials
Learn developer concepts, follow step-by-step tutorials, and discover the best free online tools — every article links to tools on DevToolsKit.
DevToolsKit
Educational
Learn the fundamentals — what developer concepts mean and why they matter.
Educational5 min
JSON Formatter: Format, Validate & Beautify JSON Online
Learn what JSON is, why developers use it, JSON data types, common errors, and how to validate and format JSON — with free online tools.
Jun 29, 2026
Educational8 min
What Is JSON? Complete Beginner Guide
Learn what JSON is, why developers use it, JSON data types, common errors, and how to validate and format JSON — with free online tools.
Mar 15, 2026
Educational7 min
What Is JWT? JSON Web Token Explained
Learn what JWT tokens are, how they work, JWT structure (header, payload, signature), and why developers use them for authentication.
Mar 16, 2026
Educational6 min
What Is Base64 Encoding? Complete Guide
Learn what Base64 encoding is, why developers use it, how it works, and when to encode or decode Base64 strings — with a free online tool.
Mar 17, 2026
Educational6 min
What Is SHA256? Hashing Explained for Developers
Learn what SHA256 hashing is, how it works, common use cases, and how to generate SHA256 hashes online — plus MD5, SHA1, and SHA512.
Mar 18, 2026
DevToolsKit
How-To Guides
Step-by-step tutorials to solve common developer tasks.
How-To Guides5 min
How to Format JSON — Step-by-Step Guide
Learn how to format, beautify, and prettify JSON with examples. Fix messy API responses and minify JSON for production using free online tools.
Mar 20, 2026
How-To Guides6 min
How to Validate JWT Tokens — Developer Guide
Learn how to decode, inspect, and validate JWT tokens. Check expiration, verify claims, and debug authentication issues with free tools.
Mar 21, 2026
How-To Guides5 min
How to Generate Secure Passwords — Best Practices
Learn how to create strong, secure passwords. Best practices for length, character types, and using a password generator for maximum security.
Mar 22, 2026
DevToolsKit
Tool Guides
Find the best free online tools for your workflow.
Tool Guides4 min
Best JSON Formatter Online — Free & Private
Looking for the best free JSON formatter online? Compare features, privacy, and speed. Format, minify, and beautify JSON instantly in your browser.
Mar 25, 2026
Tool Guides4 min
Free JWT Decoder — Decode Tokens Instantly
Free online JWT decoder. View JWT header, payload, and expiration instantly. No signup, tokens never leave your browser. Best free JWT decoder for developers.
Mar 26, 2026
Tool Guides3 min
Online UUID Generator — Free UUID v4 Creator
Generate UUID v4 online for free. Create single or bulk UUIDs instantly. Cryptographically secure, copy all with one click. Best free UUID generator.
Mar 27, 2026
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