Why does JSON parsing fail?

Common reasons include single quotes, trailing commas, or unmatched braces/brackets.

Does validation upload my data?

No. All processing runs locally in your browser.

Beginner

Learn how to quickly validate JSON, locate syntax errors, and fix them with line and column hints.

Click below to use JSON Validator

Go to the JSON tool and switch to the Editor tab if not active.

Paste JSON into the left editor. Ensure quotes are double quotes for keys and strings.

Use Validate to get instant syntax feedback with index, line, and column when applicable.

Fix the highlighted issues and validate again until status shows Valid.

Remove trailing commas—JSON does not allow them.

Keys and strings must use double quotes in JSON.