JSON Validator
Validate JSON syntax and get descriptive error messages with line numbers.
validatelintcheck
Read the guideShortcuts:⌘ KSearch?HelpD MDark modeG TAll tools
Frequently Asked Questions
Does this validator show exact line numbers?
Not in a custom UI. It simply surfaces the browser's JSON.parse error message, so you get the native parse text rather than a dedicated line/column panel.
Why does the character count not match my pasted text exactly?
On success it counts JSON.stringify(parsed).length, which is the serialized JSON character count. That means your original spacing and line breaks are not part of the number.
Do I need to click Validate?
Usually no. It re-validates automatically about 300ms after you stop typing, and the button is just a manual trigger.
Will this check my data against a JSON Schema?
No. This component only checks whether the text is syntactically valid JSON.
What happens if the input is empty?
It hides the status box instead of showing a pass or fail state. Validation only appears once there is text to parse.