// Valid JSON
✅ Valid JSON{
"name": "John",
"age": 25,
"active": true
}JSON Validator
Check JSON syntax with line-aware error reporting. Valid input is shown in the output panel; invalid input shows exactly where it broke.
JSON input
Status
Your input is processed locally and isn't uploaded for processing. Verify by opening DevTools → Network — there are no requests carrying your data.
JSON Validator examples.
// Invalid: trailing comma
❌ Invalid JSON — unexpected token at position 34{
"name": "John",
"age": 25,
}// Invalid: unquoted key
❌ Invalid JSON — expected double-quoted property name{ name: "John" }Frequently asked questions.
What does the validator check?
It checks that the input parses as valid JSON. It also reports the line and column where the parse failed.
Is my JSON sent anywhere?
No. The check runs entirely in your browser.
Does it validate against a schema?
No — this checks JSON syntax. Schema validation (JSON Schema, Ajv) is on our roadmap.