JSON Formatter
Prettify, validate, and minify JSON with a clean two-pane interface and inline error messages.
About JSON Formatter
Raw JSON straight from an API, a log dump, or a colleague's script is often squeezed onto a few unreadable lines. This formatter turns that wall of text into a clearly indented document so you can actually see the structure, while also catching syntax mistakes like trailing commas or missing quotes before they bite you downstream.
Paste any JSON and the tool parses it in full, then re-emits it with two-space indentation and sorted keys if you want that. Invalid input is not silently ignored: the exact line and character position of the first error is reported, which makes fixing broken responses much faster than hunting through the text by eye.
API developers use it to read responses during integration, data engineers tidy up config dumps before scripting against them, and support staff paste failed request bodies into it to spot malformed payloads. Anyone who touches JSON in a daily workflow will find it quicker than opening a full IDE just to read one document.
How to Use
- Paste your JSON into the input pane.
- Press Format to prettify or Minify to compress.
- Copy the output, with errors reported inline if the JSON is invalid.
Example
{"name":"Toolwell","tools":100} { "name": "Toolwell", "tools": 100 }
Formatting adds indentation and line breaks so nested structures are readable at a glance.
FAQ
Does it detect invalid JSON?
Yes. Parsing errors are shown with the exact line and position, so you can fix the input quickly.
What is minified JSON used for?
Minified JSON strips whitespace to shrink payload size for APIs, storage, and network transfer.
Can it sort object keys?
Yes, an option sorts keys alphabetically, which is handy for diffing two JSON documents.
Can I minify formatted JSON back into one line?
Yes. The minify mode recompresses the same JSON, so you can flip between a readable copy and a compact one to compare payload sizes or restore an API-ready string.
Are duplicate keys detected?
Yes. When the same key appears more than once, a warning is shown with the key name, because most parsers silently keep only the last value. That heads off subtle bugs when you inherit a response built by merging objects.