Introducing JSON Dev Tools — Free Online Developer Utilities for JSON & APIs

pasindu Ishan — Wed, 06 May 2026 15:50:02 +0000

As developers, we constantly work with JSON — API responses, config files, logs, payloads, and data transformations.

I recently built a small project called jsondevtools.org to make common JSON-related tasks faster and easier.

Why I Built It

While debugging APIs and backend services, I found myself repeatedly searching for tools to:

Format JSON
Validate broken payloads
Decode JWT tokens
Convert JSON to YAML or CSV
Minify large responses

Most existing tools were:

overloaded with ads
slow
cluttered
or missing useful developer-focused features

So I decided to build a lightweight alternative focused on:

speed
simplicity
clean UI
privacy
Current Features
JSON Formatter & Validator

Pretty-print and validate JSON instantly.

JWT Decoder

Decode JWT payloads directly in the browser.

JSON ↔ YAML Converter

Convert between JSON and YAML formats.

JSON Minifier

Reduce payload size quickly.

Developer-Friendly UI
Dark mode
Mobile responsive
Fast client-side processing
No data uploaded to servers
Built With
HTML
CSS
JavaScript
GitHub Pages

The site is fully static and runs entirely in the browser.

Future Plans

I’m planning to expand this into a larger developer toolkit with:

XML tools
Base64 utilities
Regex tester
API testing helpers
SQL formatting tools
Schema generators
Feedback Welcome

I’d genuinely appreciate feedback from developers:

UI improvements
feature requests
SEO/content ideas
missing tools

Website:

Thanks for reading

DEV Community: pasindu Ishan