How to use json validator
- Paste text into the editor. Inputs are limited to one million characters.
- Choose an operation where available, then run the tool.
- Review the result, copy it or save a text file.
A simple example
{"ok":true} is valid; {ok:true} fails because keys need double quotes.
What to keep in mind
Syntax validation does not check a JSON Schema or business rules. Duplicate keys, NaN/Infinity literals and nesting beyond 100 levels are rejected. Valid large JSON numbers are preserved without conversion to JavaScript doubles.
Good questions. Clear answers.
Does my text leave the device?
No. This tool processes text in your browser and does not retain it.
Can I undo a change?
Your original input stays in the input editor. The result appears separately.