JSON Validator

Validate JSON and get the line and column of any syntax error, with a pointer to the problem. Runs in your browser.

JSON

Result

JSON Validator with Error Location

A missing comma or an extra trailing comma is enough to make JSON invalid, and large files make it hard to spot. This validator tells you whether the JSON is valid and, if not, shows the line and column of the problem with a pointer.

Valid JSON also gets a short summary: the root type, how deeply it is nested and its size.

Key features

Live validation as you type
Line and column of the first error, with a caret under it
Summary of root type, nesting depth and size for valid JSON
Runs in your browser

Example error

Invalid JSON

Expected double-quoted property name
Line 4, column 1

}
^

How to use

Paste your JSON.
Read the result. For an error, fix the line shown and the result updates.
Use the JSON Formatter if you want it beautified.

Use cases

Debugging API payloads and config files
Finding a trailing comma or missing quote
Checking JSON before committing or sending it

Frequently Asked Questions (FAQ)

Why does my JSON fail with a trailing comma?+

The JSON standard does not allow a comma after the last item in an object or array, though some languages accept it.

Are single quotes valid in JSON?+

No. Keys and strings must use double quotes.

Does it show every error?+

It reports the first error the parser hits. Fix it and the next one, if any, appears.

Is my JSON uploaded?+

No. Validation runs in your browser.