§ Developer guides
Short, practical guides on encoding, formatting, JSON, SQL, regex, HTTP utilities, secrets, and generation workflows. Each guide targets one problem and links back to the related tools.
§ 01
~/encoding
Encoding
Base64 Encode Decode Online: The Complete GuideLearn how Base64 encoding works, when to use it, how to encode and decode online instantly, and why it is not encryption.→Base64 Encoding: 7 Real-World Use Cases for DevelopersA practical guide covering when and why to use Base64 encoding in APIs, HTML, emails, and more.→Hash Functions Explained: MD5, SHA-1, SHA-256Practical differences, security tradeoffs, and migration guidance for common hash algorithms.→SHA-256 Hash Generator Online: The Complete GuideLearn how cryptographic hash functions work, generate SHA-256 and SHA-1 hashes online, and understand when to use each algorithm.→URL Encoder Decoder Online: The Complete GuideLearn how URL percent encoding works, when to use it, how to encode and decode URLs online, and common mistakes to avoid.→Common URL Encoding Errors and How to Fix ThemDiagnose and resolve the most frequent URL encoding mistakes in web applications and APIs.→
§ 02
~/formatting
Formatting
Case Converter Online: The Complete GuideLearn the difference between camelCase, snake_case, PascalCase, and kebab-case, when each is used, and how to convert between them online instantly.→JSON Format vs Minify: When to Use EachUnderstand the difference between formatted and minified JSON and choose the right form for each context.→Common JSON Validation Errors and How to Fix ThemA practical guide to common JSON parsing and validation errors with quick fixes for each case.→Naming Conventions for Developers: camelCase, snake_case, kebab-caseA practical naming map across JavaScript, Python, SQL, CSS, and API schemas.→SQL Formatting Best Practices for Cleaner QueriesConventions and techniques that make SQL queries easier to read, review, and maintain.→SQL JOINs Explained: INNER vs LEFT with Practical ExamplesUnderstand INNER JOIN and LEFT JOIN behavior with practical SQL examples you can reuse in real queries.→Unix Timestamp Converter Online: The Complete GuideLearn how to convert Unix timestamps online, understand epoch time, debug time-related API issues, and handle seconds vs milliseconds.→Unix Timestamp Guide: Seconds, Milliseconds, and Time ZonesAvoid common date bugs when moving between logs, APIs, and user-facing timestamps.→XML Formatter Online: The Complete GuideLearn how to format XML online, understand XML document structure, common errors, and real-world use cases for SOAP, RSS, Maven, and Android.→
§ 03
~/json
JSON
Compact JSON for APIs and Logs: When Smaller Payloads Actually HelpWhen to compact JSON, when to keep it formatted, and how smaller payloads affect APIs, logs, transport costs, and debugging.→JSON Diff Online: The Complete GuideHow to compare two JSON objects online, read the diff output, and apply JSON diff in API debugging, config management, and data migration workflows.→JSON Formatter Online: The Complete GuideLearn how to format JSON online, why readable JSON matters, and how to fix common JSON errors in seconds.→JSON Schema Validator Online: The Complete GuideHow to write JSON Schemas, validate documents online, understand draft-07 keywords, and apply schema validation in API development and config management.→
§ 04
~/sql
SQL
§ 05
~/http
HTTP
cURL Converter Online: The Complete GuideHow to convert cURL commands to Python, JavaScript, Go, PHP, and Ruby — with a curl flag reference and practical examples.→cURL Auth Header Examples: Bearer Tokens, API Keys, Basic AuthPractical cURL authentication examples for Bearer tokens, API keys, Basic Auth, and the mistakes that break requests.→cURL Generator Online: The Complete GuideHow to generate cURL and PowerShell Invoke-WebRequest commands from HTTP parameters — with auth methods, body types, and flag reference.→
§ 06
~/regex
Regex
Regex Tester Online: The Complete GuideLearn how to write and test regular expressions, understand common regex syntax, use flags, and build practical patterns for validation and parsing.→Regex Tester Online: Test and Debug Regular ExpressionsHow to test regular expressions online with real-time match highlighting, use regex flags correctly, read capture groups, and apply common patterns.→Regex Capture Groups Explained: Numbered, Named, and Non-CapturingA practical guide to regex capture groups, backreferences, named groups, and the mistakes that make patterns hard to debug.→
§ 07
~/security
Security
JWT Decoder Online: The Complete GuideLearn how to decode JWT tokens online, read header and payload claims, understand expiry, and inspect token metadata without writing code.→JWT Decoder Security Notes: Decode vs VerifyUnderstand what JWT decoding reveals and what only cryptographic verification can prove.→Secrets Generation Checklist: API Keys, Passwords, and JWT SecretsA step-by-step checklist for generating and managing secrets safely in modern applications.→Secret Length Best Practices for API Keys, Passwords, and JWT SecretsHow long secrets should be in practice, why entropy matters more than decoration, and where developers choose dangerously short values.→
§ 08
~/types
Types
JSON to TypeScript Online: The Complete GuideLearn how to convert JSON to TypeScript interfaces online, handle nested objects, null values, and integrate generated types into your project.→Generate Types from JSON Samples: Fast Scaffolding Without Bad ContractsHow to generate TypeScript, Go, Python, and other models from sample JSON without hard-coding accidental structure into your codebase.→
§ 09
~/generation
Generation
Mock Data Generator Online: The Complete GuideLearn how to generate realistic mock data online in JSON, CSV, and SQL for testing, demos, prototyping, and database seeding.→Mock Data for API Testing: Realistic Fixtures Without Production RiskHow to build useful mock data for API testing, demos, QA, and local development without copying production data into unsafe places.→UUID Generator Online: The Complete GuideLearn how to generate UUIDs online, understand UUID v4 format, when to use UUIDs vs other ID types, and bulk generation for development.→UUID v4 Best Practices for APIs and DatabasesWhen to use UUIDs, where to store them, and how to avoid common implementation pitfalls.→