DEV Community: Naveen

🚀 How to Instantly Debug JSON, JWTs, curl Commands, and More — All Inside Your Browser

Naveen — Wed, 25 Mar 2026 16:49:48 +0000

If you're a developer, you probably do this at least once a day:

format some JSON
decode a JWT
convert Base64
parse a timestamp
compare two text blobs
turn a curl command into code

Each task is small…
but switching between tools slows everything down.

In this tutorial, I’ll show you how to debug these common cases quickly, safely, and directly in your browser — using client-side tools (no data ever leaves your device).

Let’s get started.

🧩** 1. Format & Validate JSON (Without Sending It to a Server)**

The classic problem:

You paste some JSON
→ it’s minified
→ broken
→ or too large for online formatters.

Here’s the fast approach:

Step 1: Open a JSON formatter
Step 2: Paste your data
Step 3: See it beautified instantly
Bonus: Validate structure + detect errors

This works even with:

deeply nested objects
1MB+ JSON files
escaped JSON strings (common in logs)

If you’ve ever had a formatter freeze, this solves it.

👉 Try it: https://www.spoold.com/tools/json/format

🔐 2. Decode a JWT Token Safely

JWTs often contain:

user info
claims
metadata
session data

But decoding them on random websites is risky.

Here’s how to decode securely:

Step 1: Copy the JWT
Step 2: Paste into a JWT decoder
Step 3: See header + payload instantly (no backend involved)

Also works with:

expired tokens
malformed tokens
multiple segment tokens

👉 Try it: https://www.spoold.com/tools/jwt/decode

🔡 3. Convert Base64, Hex, Binary, or Escape Values

Common use cases:

debugging API payloads
reading encoded logs
handling webhooks
decoding suspicious strings

You can instantly convert:

Base64 ↔ Text
Hex ↔ Text
Binary ↔ Text
URL-encoded ↔ Decoded
Escape ↔ Unescape
Steps:
Paste your encoded data
Choose target format
See clean output instantly

👉 Try it: https://www.spoold.com/tools/base64

🕒 4. Convert Timestamps Like a Pro

This one surprises new developers.

Unix timestamps come in:

seconds
milliseconds
microseconds

You don’t have to guess.

Steps:
Paste or type your timestamp
The tool detects the format
It shows the exact date/time with timezone support

This helps with:

logs
audit trails
cron debugging
API analytics

👉 Try it: https://www.spoold.com/tools/time/convert

🧪 5. Test and Validate Regex With Instant Output

Regex is powerful…
but trying it in code repeatedly is painful.

Try this workflow:
Write your regex pattern
Add your sample text
See matches highlighted instantly
Export or refine as needed

Supports:

global matching
groups
multi-line flags
case sensitivity

👉 Try it: https://www.spoold.com/tools/regex/test

🌐 6. Convert curl Commands to Code

Ever copied a curl command from documentation and needed it in:

JavaScript
Python
Node.js
Go
Shell
Rust

You can convert it instantly.

Steps:
Paste the curl command
Pick your language
Copy the generated snippet

This is especially useful during API debugging.

👉 Try it: https://www.spoold.com/tools/http/curl

📝 7. Compare Text or JSON (Diff Tool)

For investigating:

API differences
config changes
payload mismatches
code snippets
Steps:
Paste text on left
Paste text on right
See differences highlighted

Supports:

whitespace modes
character/word/line diff
copy result options

👉 Try it: https://www.spoold.com/tools/json/diff

🧠 Bonus: Auto-Detect Mode (Paste Anything → Right Tool Opens)
This is the magic part.

Try this:

Copy any JSON / JWT / curl / URL / timestamp
Go to https://www.spoold.com
Paste it
Watch the correct tool open automatically

This is useful when you're in a rush and don’t want to think about which tool to open.

🎁 Why These Tools Are Safe to Use

All the utilities used in this tutorial run:

100% inside your browser
with zero server calls
no tracking
no storage
no ads

This means you can safely paste:

private tokens
production logs
sensitive API responses
internal JSON

Everything stays on your machine.

⭐ Final Thoughts

Tools don’t make you a better developer —
but they make your work faster, cleaner, and less painful.

If you spend even 10 minutes a day formatting JSON or converting payloads, the right tools can save hours every week.

If you want to explore more utilities:

👉 https://www.spoold.com

Let me know which tool you’d like to see next — I build new ones every week.

🚀 The Developer Toolbox I Built Because I Was Tired of Opening 10 Tabs a Day

Naveen — Tue, 24 Mar 2026 17:04:52 +0000

Every developer has that moment.

You're in the middle of debugging something simple… and suddenly you’re juggling:

a JSON formatter
a JWT decoder
a Base64 converter
a timestamp tool
a regex tester
a curl-to-code generator

…until your browser looks like a graveyard of tiny tasks.

One night, after pasting a large JSON into a random formatter that tried to force browser notifications, I closed everything and asked myself:

Why do we rely on 10 different sites for basic dev tasks…
and why do so many of them track us?

That frustration turned into a small side project that slowly grew into something bigger than I expected.

🌱 The Idea: A Single Place for Developer Utilities
I didn’t plan to build a full platform.

I just wanted:

tools that load instantly
tools that don’t track anything
tools that don’t send data to a server
no ads
no pop-ups
no signup walls

So I decided on one rule:

Everything should run client-side.
No data should leave the browser.

That became the foundation of what I started building.

🛠️ What I Built So Far

What began as a single JSON formatter turned into a toolbox with 40+ tools, including:

JSON formatter & validator
JWT decoder
Base64 / Hex / Binary converters
CSV viewer
Markdown preview
curl → code
Regex tester
UUID & hashing tools
QR generator
Diff tools
URL shortener
Flow Canvas (for quick diagrams)

The interesting part?

Most of the heavy lifting happens inside your browser — nothing gets uploaded anywhere.

That capability led to one of the most surprising pieces of feedback I got:

“No AI tool could unescape this huge JSON, but your tool did.”

That message made my entire week.

🔒 Why Privacy Matters for Dev Tools
Developer tools handle:

API keys
tokens
internal JSON
sensitive payloads
private logs

Yet most online utilities send every character you paste straight to a server.

I wanted the opposite experience.
Paste → process → done.
All local. No risk.

It turns out a lot of developers want the same.

⚡ The Most Fun Part: Flow Canvas
One tool that unexpectedly took off is Flow Canvas — a simple drag-and-drop board for quick discussion diagrams.

A lot of users told me it was:

easier than heavy diagram apps
perfect for fast planning
great for quick “explain this bug” sessions
surprisingly fun to use

It wasn’t planned.
It was experimental.
But people loved it.

💬 What I’m Trying to Build Next
This year, I want to focus on:

better auto-detection (paste something → tool opens)
more powerful converters
browser-only utilities for security workflows
maybe even a small dev-themed game inside the toolbox

And I’m open to ideas from the community.

🧪 Want to Try It?
If you want to see it or break it:

👉 https://www.spoold.com

If something feels slow, confusing, or missing — tell me.
I’m building this toolbox with developers, not just for them.

❓What tiny dev task do YOU find unnecessarily annoying?
If there’s a small tool you wish existed, reply here — I’ll build it.