{ }
No signupJSON Beautifier
Beautify messy or minified JSON with proper indentation and syntax highlighting.
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JSON Formatter
Format, validate, and minify JSON with syntax highlighting.
json-formatter.tool
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Formatted result will appear hereNothing you paste here is ever sent to a server - it all happens locally in your browser.
What is a json formatter?
A JSON formatter takes minified or messy JSON - the kind you get from an API response, a log file, or a database export - and turns it into readable, properly indented text. It also validates the structure along the way, so syntax errors like a missing comma or an unclosed bracket surface immediately instead of failing silently somewhere downstream.
How to use this tool
- 1Paste your JSON into the input box on the left.
- 2Click Format to beautify it with indentation, or Minify to compress it to a single line.
- 3If the JSON is invalid, the exact line and column of the error is shown so you can fix it fast.
- 4Use Copy to grab the formatted result, or Load sample to see the tool in action first.
Common use cases
Debugging an API response that came back as one unreadable line
Cleaning up JSON before pasting it into documentation or a bug report
Validating a config file before deploying it
Shrinking a JSON payload's size with Minify before sending it over the wire
Good to know
Frequently asked questions
Is my JSON data uploaded anywhere?
No. Formatting and validation both happen entirely in your browser using JavaScript - nothing you paste is sent to a server or stored anywhere.
What's the difference between Format and Minify?
Format adds indentation and line breaks to make JSON human-readable. Minify strips all unnecessary whitespace to produce the smallest possible output, which is useful for reducing payload size.
Why does it show a line and column number for errors?
Standard JSON.parse errors only give a raw character position, which isn't useful for finding the problem in a large file. This tool converts that into a line and column number so you can jump straight to the issue.
Does it support JSON5 or JSONC (comments)?
Not currently - this tool validates against strict JSON syntax (RFC 8259), which does not allow comments or trailing commas.
quick_facts.json
{
"runs_in_browser": true,
"data_sent_to_server": false,
"signup_required": false,
"price": "free",
"category": "JSON Tools"
}