JSON Formatter & Validator: Make Your JSON Readable (and Error-Free)

Gonzalo Barrera — Wed, 25 Mar 2026 22:46:43 +0000

Working with JSON is part of everyday life as a developer. Whether you're dealing with APIs, config files, or debugging responses, you've probably faced messy or broken JSON at some point.

That’s where a JSON formatter and validator becomes essential.

👉 Try it here: https://devtools.cl/tools/json-formatter

What is a JSON Formatter?

A JSON formatter is a tool that takes raw or minified JSON and transforms it into a clean, readable structure with proper indentation.

Instead of this:

{"user":{"name":"John","age":30,"roles":["admin","editor"]}}

You get this:

{
  "user": {
    "name": "John",
    "age": 30,
    "roles": ["admin", "editor"]
  }
}

Much better, right?

Why You Should Use One

1. Easier Debugging

Readable JSON makes it much easier to spot errors or missing fields.

2. Validate Syntax Instantly

A good formatter doesn't just prettify — it also tells you if your JSON is invalid.

3. Better Understanding of Data

Nested structures become clear when properly formatted.

Features of This Tool

The JSON Formatter & Validator on devtools.cl was built with simplicity and privacy in mind:

✅ Instant formatting
✅ Real-time validation
✅ Clear error feedback
✅ Copy to clipboard
🔒 100% client-side (your data never leaves your browser)

This is especially important if you're working with sensitive data or tokens.

How to Use It

Using the tool is straightforward:

Paste your JSON into the input panel
Click "Format JSON"
View the formatted output instantly
Copy it if needed

If your JSON is invalid, you'll get a clear error message so you can fix it quickly.

Example Use Cases

Debugging API responses
Cleaning up JSON logs
Validating request payloads
Working with configuration files
Learning JSON structure

Built for Developers

This tool is part of a growing collection of utilities at devtools.cl, a project focused on lightweight, fast, and privacy-friendly tools for developers.

No fluff, no tracking, just useful tools.

Final Thoughts

If you work with APIs or data structures, a JSON formatter isn’t optional — it’s essential.

Having a fast, local, and reliable one can save you a lot of time (and frustration).

👉 Give it a try: https://devtools.cl/tools/json-formatter

If you found this useful, feel free to check out the rest of the tools — more coming soon 🚀

I got tired of switching between dev tools… so I built my own

Gonzalo Barrera — Fri, 20 Mar 2026 06:46:28 +0000

I got tired of switching between dev tools… so I built my own

As a developer, I kept running into the same small frustration over and over again.

Format some JSON → open a site
Decode a Base64 string → another site
Generate a UUID → another tab
Test a cron expression → yet another tool

It sounds trivial, but it adds up. Context switching kills flow.

So I decided to build my own collection of developer tools — all in one place.

The idea

I wanted something:

Fast
Minimal
No login
No distractions
And most importantly: privacy-first

So I built 👉 https://devtools.cl

What makes it different?

Most online tools send your data to a server.

Mine don’t.

Everything runs locally in your browser.

That means:

Your JSON never leaves your machine
Your tokens are never stored
Your data stays yours

This was especially important for things like:

JWT debugging
JSON formatting
Hash generation

Built with Next.js (and keeping it simple)

The whole project is built with Next.js and deployed on Vercel.

One key decision I made early:

👉 Keep everything client-side

No backend. No database. No API calls.

Just pure frontend tools doing one thing well.

Here’s a simplified example of the JSON formatter logic:

const format = () => {
  try {
    const parsed = JSON.parse(input)
    setOutput(JSON.stringify(parsed, null, 2))
  } catch {
    setOutput("Invalid JSON")
  }
}

Simple, fast, and reliable.

Current tools

So far I’ve built tools like:

JSON Formatter & Validator
Base64 Encoder / Decoder
JWT Debugger
Password Generator
UUID Generator
SQL Formatter
URL Encoder / Decoder
HTML Beautifier
CSS Minifier
Markdown Preview
Cron Expression Editor
SHA-256 Generator

And I’m adding more regularly.

What I learned

A few takeaways from building this:

Small tools are surprisingly useful
Performance matters more than features
Developers really value privacy (more than I expected)
Shipping fast beats overthinking

What’s next

I’m currently working on:

Improving SEO (so people can actually find it 😅)
Adding more niche tools
Writing short guides for each tool

Would love your feedback

If you have ideas for tools I should add, I’m all ears.

Or if something feels off, slow, or missing — tell me.

👉 https://devtools.cl

Thanks for reading 🙌

Forem: Gonzalo Barrera

JSON Formatter & Validator: Make Your JSON Readable (and Error-Free)

What is a JSON Formatter?

Why You Should Use One

1. Easier Debugging

2. Validate Syntax Instantly

3. Better Understanding of Data

Features of This Tool

How to Use It

Example Use Cases

Built for Developers

Final Thoughts

I got tired of switching between dev tools… so I built my own

I got tired of switching between dev tools… so I built my own

The idea

What makes it different?

Built with Next.js (and keeping it simple)

Current tools

What I learned

What’s next

Would love your feedback