Why I Built the JSON Comparison Tool Every Developer Actually Needs

Sourabh Soni — Fri, 12 Sep 2025 12:14:25 +0000

As a developer, I spend way too much time comparing JSON responses. Whether I'm debugging API endpoint changes, validating data transformations, or comparing configuration files across environments, JSON comparison is a daily reality. But here's the frustrating part: most existing tools are either half-baked solutions, ad-riddled distractions, or outright incorrect in their comparisons.

After testing dozens of JSON comparison tools (yes, even the "famous" ones that shall remain nameless), I realized something had to change. So I built jsontoolbox.com - the JSON comparison tool I always wished existed.

The Problem with Existing JSON Tools

Let me be brutally honest about what's wrong with the current landscape:

They're Static and Limiting

Most tools lock you into a "compare and done" workflow. You paste two JSON blobs, hit compare, and then you're stuck in read-only mode. Want to fix something and see the diff update? Too bad - start over.

They don't think about user workflow

A productivity tool should always consider user's workflow to enhance productivity while most tools out there try to clone each other and only focus on SEO.

They're Ad-Heavy Distractions

Nothing kills productivity like trying to focus on complex JSON structures while banner ads flash around your screen. These tools treat developers like products to monetize, not problems to solve.

They Get Basic Comparisons Wrong

Some tools fail at fundamental tasks (cough*HyperTest*cough) like deep array comparisons or handling nested objects correctly. If your tool can't handle basic JSON structures accurately, what's the point?

They Don't Scale

Large JSON files? Forget it. Most tools either crash, become unusably slow, or simply refuse to process anything substantial.

Building from First Principles

When I started building jsontoolbox.com, I asked myself: "What would the perfect JSON comparison experience look like?"

The answer came from thinking about how I actually work with JSON data:

I need to see differences immediately - not after clicking a button
I want to keep editing while seeing live updates
I need to know exactly where I am in large JSON structures
I want it fast, even with massive files
I need it to actually work correctly - no false positives or missed differences
I need to dynamically jump to diffs - help me navigate efficiently

What Makes jsontoolbox.com Different

Dynamic Real-Time Comparison

This was the game-changer. As you type or modify JSON in either editor, the differences update instantly. No more copy-paste-compare-repeat cycles. You can fix issues and watch the diff disappear in real-time.

Smart JSONPath Tracking

Ever get lost in a 500-line JSON file? The cursor position shows you exactly where you are using JSONPath notation - separately for both editors. This small feature has saved me countless minutes of scrolling and searching.

Intelligent Diff Navigation

Jump directly to specific differences from a diff summary list, or use next/prev buttons to walk through changes systematically. No more manual scanning through highlighted sections.

Performance That Actually Matters

Built to handle large JSON files without breaking a sweat. Whether it's a 2KB config file or a 10MB API response, the comparison stays responsive.

Developer-First UX

Set your keybindings to match VSCode or Sublime Text. Import multiple files via drag-and-drop. Download files with custom filenames. Every interaction is designed around how developers actually work. Did I mention it has a dark mode as well?

Privacy by Design

All processing happens client-side. Your JSON data never leaves your browser. No accounts required, no data tracking, no privacy concerns. It is enterprise ready!

The Features That Matter

Here's what you get with jsontoolbox.com:

Live diff updates as you edit
Multiple file import and drag-drop support
JSONPath navigation to stay oriented in complex structures
Diff navigation with next/prev buttons or from summary
Blazing fast performance even with large files
Customizable keybindings (VSCode/Sublime Text modes)
Client-side processing for complete privacy
Ad-free experience focused on your work
Custom download names for organized workflows
Case-insensitive comparisons when needed
Multi-tool workspace for comparing multiple file pairs

Why This Matters

JSON comparison isn't just a nice-to-have developer tool - it's critical infrastructure for modern software development. API versioning, data validation, configuration management, debugging - these workflows break down when your comparison tool is unreliable or frustrating to use.

I built jsontoolbox.com because developers deserve tools that enhance their thinking, not fight against it. Tools that are fast, accurate, and designed around real workflows.

Try It Yourself

If you work with JSON data (and who doesn't these days?), give jsontoolbox.com/compare a try. It also helps you format/validate/minify/convert/edit multiple json strings on the same page!

I'm particularly interested in feedback from:

Backend developers working with API responses
DevOps engineers managing configuration files
QA professionals validating data transformations
Anyone who's ever been frustrated by existing JSON tools

What's Next?

This is just the beginning. I'm working on additional JSON utilities that follow the same philosophy: fast, accurate, and built for real developer workflows.

Have ideas for features? Run into edge cases? I'd love to hear from you. The best tools are built in partnership with the people who use them.

What's your biggest JSON-related pain point? How do you currently handle JSON comparisons in your workflow? Let me know in the comments below.

How I created best online JSON Formatter

Sourabh Soni — Thu, 25 Feb 2021 12:09:28 +0000

In my day job, we work with Java and Go based microservices. All these microservices interact with each other either via REST end points or Kafka updates.
Regardless of the medium of interaction, the format of exchanging data is JSON!

What is JSON?

JSON stands for JavaScript Object Notation. Initially a part of Javascript standard, it has now become a norm for transporting data over a network because of its small footprint as compared to its rival XML!

This is how a sample JSON object looks like -

{
  "name": "Dave",
  "age": "32",
  "hobbies": [
    "soccer",
    "trekking"
  ]
}

What is a formatter?

Because JSON is represented as text everywhere, usually when you try to read it in code or logs, it shows up like this -

{"name":"Dave","age":"32","hobbies":["soccer","trekking"]}

This small (minified) JSON may not look very complex to read, but in real world software, a JSON object may even spread across 100s of lines.
A formatter is a tool that you can use to format this minified string format into a tree like tabbed JSON (as represented above) so that it is easier to read and understand this data.

What is JSONToolBox?

JTB (JSONToolBox) is an online JSON formatter in simple terms. It lets you paste in minified JSON string in one editor and then as you type in, formats that JSON to a tree like view which we call formatted JSON.

Why is it the best formatter?

Coming back to the original context of this article. Consider our application environment where 20+ microservices are constantly interacting with each other and all the interaction information is logged as JSON strings.
When we need to debug a complex flow where data passes between multiple microservices, it becomes a very difficult task as for any other online formatter we need to open multiple tabs in the browser each containing one JSON.
Whereas in JTB, you can format/edit multiple JSON strings at the same time in the same page!

Just click on add formatter and one more formatter pane appears which you can collapse as well if not needed.

Okay, cool! What else makes it better?

Just being able to format/minify multiple JSON at the same time does not make it the best online JSON formatter out there. It has various other small nifty tricks up its sleeve which are created based on developer inputs or looking at our debugging/development workflow. Here's the list of other cool features of JTB

Copy minified JSON in a single click
Copy any child object in a single click
Download formatted JSON as a file
Change file name of the JSON you are formatting/editing/downloading
Search in formatted JSON
Drag and drop a JSON file to format/minify
Import multiple files at the same time.
No advertisements!

Oh and did I mention it is a PWA!!!
So it is also the best offline JSON formatter out there :D

Although there is a plethora of online JSON formatters out there, I want to make JSONToolBox to be the most developer friendly tool out there. So, if you have any suggestions/feedback that you think can improve your productivity while using JTB then do mention here or DM me on twitter. Would love to hear what people think of it.

Happy coding!

DEV Community: Sourabh Soni