JSON Validator
Check whether JSON is valid — and if not, get the exact error, line and column.
How to use the JSON Validator
- Paste your JSON.
- A green tick means it is valid; a red message means it is not.
- Read the error with its line and column and fix that spot.
About the JSON Validator
The JSON Validator answers one question quickly and precisely: is this JSON valid? Paste your text and it is parsed immediately. When the JSON is well-formed, you get a green tick along with the detected top-level type, so you know whether you are looking at an object, an array or a primitive value.
When the JSON is broken, the tool shows the exact parser error message together with the line and column where parsing failed. Instead of guessing where a stray comma, missing quote or unbalanced bracket lives, you are pointed straight to the spot that needs fixing. That turns a frustrating hunt through a long payload into a quick, targeted correction.
Validation runs entirely in your browser using the same JSON parser your code relies on, so results match what a real application would see, and nothing you paste is ever uploaded. Once your JSON checks out, explore it in the JSON Viewer or tidy it up with the one-click Format button in the JSON Editor.
Frequently asked questions
How accurate is the validation?
It uses the browser native JSON parser, the same standard parser your application code uses. If it reports valid, a conforming JSON parser will accept it too, so results are trustworthy rather than a loose approximation.
What does the error message tell me?
On failure you see the exact parser error along with the line and column where parsing stopped. That points you directly at the problem, which is often a missing comma, an unquoted key or an unbalanced bracket.
What is the top-level type it shows?
When your JSON is valid, the tool reports the type of the outermost value, such as object, array, string or number. This is a quick sanity check that the payload has the shape you expected.
Does it fix errors for me?
No. The validator locates and explains problems but does not rewrite your data. Once you have corrected the reported spot, you can format or minify the result in the JSON Editor.
Is my data kept private?
Yes. Validation happens entirely in your browser and nothing is sent to any server, so it is safe to check payloads that include secrets or personal information.