JSON Formatter
Format, minify, and validate JSON with inline error positions.
Formatted output, tree view and TypeScript types appear here.
About the JSON Formatter
The Freemium.Tools JSON formatter beautifies, validates and minifies JSON in your browser and points at the exact position of any syntax error.
Pasting raw API output into a formatter is the fastest way to see the shape of the data and to find the missing comma or stray bracket that is breaking a parser.
Formatting runs locally, so API responses containing tokens or customer data are never sent anywhere.
How to use it
- 1Paste your JSON. Drop in the raw JSON text.
- 2Format or minify. Beautify it with indentation, or minify it down to one line.
- 3Copy the result. Copy the cleaned JSON back into your code.
Frequently asked questions
Why is my JSON invalid?
The most common causes are a trailing comma, single quotes instead of double quotes, and unquoted keys. The error message points at the position where parsing failed.
Is my data sent to a server?
No. Parsing and formatting happen in your browser, so pasted payloads never leave your device.
What is the difference between formatting and minifying?
Formatting adds indentation and line breaks so humans can read the data. Minifying strips all optional whitespace so the payload is as small as possible for transmission.
Can it handle large files?
Yes, up to what your browser tab can hold in memory; multi-megabyte payloads work but take a moment to render.
Does it support JSON with comments?
Standard JSON does not allow comments, so a file containing them will be reported as invalid.