Instant results
Get the output immediately without waiting for a network request.
JSON FORMATTER
JSON Formatter
Use json formatter directly in your browser. Your input never leaves this device, and the result is ready to copy immediately.
- Free to use
- No sign-up
- No server uploads
0
Output
Your result will appear here.Enter your content, then select “Format JSON”. You can also press Ctrl/⌘ + Enter.
WHY THIS TOOL
Key features
Simple by design
No installation, account, or complicated settings are required.
Private processing
Your input stays on your device and is never uploaded to our server.
HOW TO USE
How to use it
Go from input to a copied result in three simple steps.
- 1
Paste the content you want to process into the input field.
- 2
Select “Format JSON”.
- 3
Review the output and copy the result.
FAQ
Frequently asked questions
Is my input sent to a server?
No. All processing happens locally inside your current browser.
Is this tool free?
Yes. You can use it for free without an account or usage limits.
Does it work on mobile?
Yes. It works in current mobile and desktop browsers.
Format JSON while preserving the original values
Try a small document first
Paste {"name":"Ada","active":true} and run the formatter. The result places each property on its own indented line. Strings use double quotes; true is a boolean, while "true" is a string. Formatting changes whitespace, not the meaning of either value.
Large numbers retain their spelling
The integer 9007199254740993 remains 9007199254740993, and 1.2300 keeps its trailing zeros. The formatter validates syntax and changes whitespace outside strings instead of serializing a JavaScript number. A receiving application can still round large numbers; send identifiers as strings if that application requires it.
Formatting cannot repair an ambiguous document
A trailing comma such as {"a":1,} is invalid JSON. Remove the comma and try again. Duplicate keys are preserved, but another parser may discard earlier values, so review duplicates yourself. Use synthetic values when sharing examples: clipboard history and extensions are outside this tool’s control.