Top 20 Developer Tools You Need in 2026

Why Online Developer Tools?

Every developer has a set of tools they reach for daily. The problem? They're scattered across dozens of bookmarks, CLI utilities, and VS Code extensions.

What if they were all in one place? That's what TunnuTHub does.

Here are our top 20 picks — all free, all in your browser.

Code Formatters

1. JSON Formatter

Not just a formatter — it has a full CodeMirror editor, smart auto-fix for common issues, and a diff view (text + tree mode). Upload and download JSON files too.

2. SQL Formatter

Paste messy SQL queries and get clean, properly indented output. Also minifies.

3. HTML Beautifier

Format HTML with proper nesting. Great for cleaning up minified HTML from page sources.

4. CSS Formatter

Beautify or minify CSS. Perfect for cleaning up stylesheets.

Encoders & Converters

5. Base64 Encode/Decode

Real-time encoding/decoding with swap functionality.

6. JSON ↔ YAML

Convert between the two most popular config formats instantly.

7. JSON → TypeScript

Paste any JSON and get TypeScript interfaces automatically. Saves hours of manual typing.

8. Timestamp Converter

Convert between Unix timestamps and human-readable dates. Shows ISO 8601, UTC, local time, and relative time.

Generators

9. UUID Generator

Generate UUID v4 in bulk. Options for uppercase, no dashes.

10. Cron Expression Builder

Build cron schedules visually. No more memorizing syntax.

11. Fake Data Generator

Generate realistic test data — names, emails, addresses, phone numbers. Copy as JSON.

12. .gitignore Generator

Select your tech stack and get a complete .gitignore. Supports 11 templates.

Testing & Debugging

13. Regex Tester

Test regex patterns with real-time highlighting and match details.

14. JWT Decoder

Decode JWT tokens to inspect header and payload. Auto-detects timestamps.

15. HTTP Status Reference

Searchable reference for all HTTP status codes. Know your 418s from your 503s.

Web & SEO

16. Meta Tag Generator

Generate complete meta tags for SEO, Open Graph, and Twitter Cards.

17. UTM Builder

Build UTM-tagged URLs for campaign tracking in Google Analytics.

CSS Tools

18. CSS Gradient Generator

Create beautiful gradients with a visual editor.

19. Box Shadow Generator

Multi-layer shadows with visual preview.

20. Flexbox Playground

Learn and build flexbox layouts interactively.

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All 20 tools (and 41 more!) are available at TunnuTHub — free, fast, and private.