How to Validate JSON Online (With the Exact Error Location)

A missing comma, an unclosed bracket, a trailing comma that some parsers tolerate and others reject — JSON's syntax is simple, but a single misplaced character breaks the whole document, and finding that one character in a large blob by scanning it visually is slow. A validator does the finding for you.

Why "Just Try Parsing It" Isn't Quite Enough

JSON.parse will tell you that something's wrong, but the raw error message a browser produces isn't always immediately actionable on its own — something like "Unexpected token" doesn't tell you where. QR Ivify's JSON Validator goes a step further: when the browser's own JSON parser reports a position for the error (which V8-based browsers do for most syntax errors), it's converted into a line and column number — "line 4, column 12" — pointing you straight at the actual spot instead of leaving you to count characters.

Step by Step

1. Open the JSON Validator.
2. Paste your JSON into the box.
3. Click "Validate JSON."
4. If it's invalid, read the error message and location. If it's valid, use the shortcut to jump straight to the JSON Formatter.

Why the Location Isn't Always Available

Not every JSON syntax error comes with a precise position — it depends on exactly what went wrong and how the browser's parser reports that specific failure. When a location isn't available, you still get the real error message, just without a line/column pointer. This is disclosed honestly rather than the tool inventing a location that might be wrong.

What This Doesn't Check

This validates syntax — that the JSON is well-formed and parseable. It doesn't validate structure — whether specific fields exist, whether a value is the right type, or whether the data matches an API's expected shape. That's what a JSON Schema validator is for, a different (and more involved) kind of check than "is this even valid JSON."

Frequently Asked Questions

Will I always get a line and column number for an error? Usually, but not always — it depends on whether the browser's own JSON parser reports a position for that specific error. When it doesn't, you still get the error message itself.

Does this validate against a schema? No — this checks that the JSON is syntactically valid, not that it matches a particular structure or set of required fields.

Does this upload my JSON anywhere? No. Validation happens entirely in your browser using the native JSON parser.

What do I do once my JSON is valid? Use the "Format this JSON" shortcut to jump straight to the JSON Formatter and pretty-print it.

Try It

Need to check if JSON is valid and find exactly where it breaks? QR Ivify's free JSON Validator points you straight at the problem. Once it's valid, pretty-print it with the JSON Formatter, or shrink it with JSON Minifier.