How it works
Paste your JSON on the left. It is checked as you type, and the result shows on the right.
Choose 2 spaces, 4 spaces or a tab to indent it, or minified to remove all extra whitespace.
If the JSON is invalid, the message says what went wrong and, where the browser reports it, the line and column.
Good to know
JSON is strict. Keys and strings need double quotes, and a trailing comma after the last item is not allowed. These are the most common errors.
Formatting changes only whitespace. Very large numbers may lose precision, because JSON numbers are read as ordinary floating point numbers.
Frequently asked questions
Why is my JSON invalid?
Common causes are single quotes instead of double quotes, a trailing comma, a missing comma between items, unquoted keys, and comments, which JSON does not allow.
Is it safe to paste private data?
The JSON is processed in your browser and is not uploaded, so tokens and records do not reach a server. Avoid pasting real secrets into any tool unless you need to.
What does minify do?
It removes spaces and line breaks so the JSON is as short as possible, which is useful for sending it over a network or putting it in a single line.