When an API request fails, most developers do the same thing.
They copy the JSON payload and paste it into a JSON formatter.
I've done it.
You've probably done it too.
For small issues, formatting helps.
But after working with APIs for years, I realized something important:
Formatting JSON and debugging JSON are two completely different things.
And confusing the two can waste a lot of time.
The Illusion of "Good Looking JSON"
Consider this example:
{
"name": "XYZ",
"email": "xyz@example.com",
}
Looks clean.
Looks organized.
Looks professional.
Yet this JSON is invalid.
The trailing comma makes the entire payload fail.
The problem isn't readability.
The problem is correctness.
That's where many debugging sessions go wrong.
Formatting Solves One Problem
A formatter makes JSON easier to read.
For example:
{"name":"XYZ","role":"Developer","active":true}
becomes:
{
"name": "XYZ",
"role": "Developer",
"active": true
}
That's useful.
Especially when dealing with API responses.
But notice what happened:
The formatter improved appearance.
It didn't verify correctness.
What Actually Breaks APIs
Most API failures I encounter come from:
- Trailing commas
- Missing commas
- Invalid escape characters
- Unclosed braces
- Incorrect data types
- Missing required fields
These are validation problems.
Not formatting problems.
A formatter can make invalid JSON look beautiful.
It still won't work.
A Real Example
A while ago, I was debugging an API integration.
The request payload looked perfect.
The structure matched the documentation.
The authentication token was valid.
The endpoint was correct.
Everything seemed fine.
The issue?
A single missing comma hidden inside a large payload.
The API rejected the request instantly.
The formatter didn't reveal the issue.
A validator found it immediately.
That's when I realized how much developers rely on formatting when they actually need validation.
Why I Built Online JSON Tools
While working on APIs and integrations, I repeatedly found myself switching between multiple websites:
- One formatter
- One validator
- Another tool for minifying
- Another tool for inspecting large payloads
That became the motivation behind onlinejsontools.co.in.
I wanted a place where developers could:
- Format JSON
- Validate JSON
- Detect syntax errors
- Find exact line numbers
- Find exact column numbers
- Understand why JSON is failing
without constantly jumping between tools.
The Better Debugging Workflow
Instead of:
- Format JSON
- Assume it's correct
- Start debugging the backend
Try this:
- Validate JSON
- Fix all syntax issues
- Format JSON
- Verify request structure
- Then investigate backend logic
You'll often discover the issue before touching server-side code.
Final Thoughts
Formatting is useful.
Validation is essential.
A formatter helps humans read JSON.
A validator helps computers understand JSON.
And when an API suddenly stops working, the difference between those two tools matters a lot more than most developers realize.
The next time a request fails, don't just format the payload.
Validate it first.
You might save yourself an hour of debugging.
What's the most frustrating JSON bug you've ever encountered?