Before you start
What you need
One complete JSON value whose syntax you want to confirm.
Developer & Data
JSON Validator
Check JSON syntax and receive structural counts without echoing every source value into the report.
- 01Runs in this browser
- 02Limits are explicit
- 03Copy or download output
No black box
How this tool handles the input
The browser parses the value and walks its structure iteratively. It reports facts about the shape but does not apply JSON Schema or business rules.
What you get
What the page gives back
A compact validation report with root type and structural counts.
Keep in mind
Use the result responsibly
A valid result does not prove that required fields, data types, permissions, or domain rules are correct.
Practical uses
Where this tool earns its place
- Check a webhook payload before replaying it.
- Measure the shape of a configuration object.
- Separate syntax errors from schema errors during support.
Verified data boundary
Source text stays on this page.
The published contract marks these tools as client-only processing. Nirmion uses the API only to confirm that this workspace is enabled in MySQL; source values and results are not sent to Flask.