JSON Formatter & Validator
Paste JSON to pretty-print it with proper indentation and validate the structure. If something's wrong, we point you at the line and column. All formatting happens in your browser — nothing is sent to a server.
{
"name": "ToolVault",
"tools": 5,
"private": true
}Frequently asked questions
Does ToolVault save my pasted JSON anywhere?+
No. Validation and formatting happen entirely in your browser. We never upload your JSON, log it, or store it.
What indentation does the formatter use?+
You can switch between 2 spaces, 4 spaces, and tabs. The default is 2 spaces, which matches what most modern style guides recommend.
Can it handle very large JSON files?+
Yes, but your browser is the limit. Files in the tens of megabytes range usually work fine on modern desktops. For multi-hundred-MB files, a streaming parser in a script is a better choice.