JSON Validator
Check JSON syntax and get an error message with an approximate line and column location.
How the JSON validator works
Paste JSON or select a .json file, then choose Validate JSON. The validator parses the input in your browser and reports whether the syntax is valid. When parsing fails, it displays the browser’s error message and an approximate line and column when the parser provides a character position.
Valid JSON example
{"status":"success","count":2,"items":[{"id":1},{"id":2}]}Common JSON syntax errors
JSON property names and text values must use double quotes. Remove trailing commas, check that every opening bracket has a matching closing bracket, and use true, false or null in lowercase. JSON does not support comments.
Frequently asked questions
Does this validator send data to a server?
No. JSON.parse runs in your browser and the input is not submitted to our server.
Can it repair invalid JSON automatically?
No. It identifies syntax errors so you can correct the original input.
Is the line and column exact?
The location is approximate when the browser’s parser error includes a character position.
Related Free JSON and Data Conversion Tools
Explore these related browser-based utilities to prepare, check, and convert structured data for your workflow.
Fix common JSON syntax problems
JSON is strict about its syntax. Property names and string values must use double quotation marks, commas separate items, and the final item in an object or array must not have a trailing comma. The literals true, false and null must be written in lowercase.
Every opening curly brace or square bracket needs a matching closing character. JSON does not support comments, single-quoted strings, undefined or trailing commas. These are frequent causes of errors when JSON is copied from configuration files or programming code.
The validator uses the browser’s JSON parser. When the browser reports a character position, the page estimates the corresponding line and column; this location is a guide rather than a guaranteed editor-style diagnostic. The tool identifies syntax errors but does not automatically repair the source.