JSON Formatter
Format, beautify, validate and minify JSON instantly. Paste JSON data, make it readable, check for errors and copy clean output.
Input JSON
Paste compact, messy or formatted JSON. Use Format to beautify it or Minify to compress it.
Formatted output
Valid JSON output will appear here. Copy it when you are done.
Common JSON formatter uses
What is JSON?
JSON stands for JavaScript Object Notation. It is a common text format for storing and sending structured data.
Why format JSON?
JSON can be valid but hard to read when it is compressed into one line. Formatting makes the structure easier to understand.
Why minify JSON?
Minifying removes unnecessary whitespace. This can be useful when storing, sending or pasting JSON into systems that prefer compact data.
Common JSON mistakes
Using single quotes
JSON strings must use double quotes. Single quotes are valid in JavaScript, but not valid JSON.
Leaving trailing commas
JSON does not allow trailing commas after the last item in an object or array.
Confusing JSON with JavaScript objects
JSON looks similar to JavaScript object syntax, but it is stricter and has fewer allowed features.
Free online JSON formatter and validator
This JSON formatter helps you format, beautify, validate and minify JSON directly in your browser. It is useful for API responses, configuration files, logs, test data and developer workflows.
Paste your JSON into the input field and click Format JSON to make it readable. If the JSON is invalid, the tool will show an error message from the parser.
Is JSON formatting private?
Yes. This tool runs locally in your browser, so your JSON does not need to be uploaded to a server. That makes it useful for quick checks, examples and everyday development tasks.
JSON Formatter FAQ
What does a JSON formatter do?
It turns compact or messy JSON into readable, indented JSON.
Can this tool validate JSON?
Yes. It parses your input and shows whether the JSON is valid.
What is minified JSON?
Minified JSON has unnecessary spaces and line breaks removed, making it more compact.
Why is my JSON invalid?
Common causes include single quotes, trailing commas, missing commas, unquoted keys or broken brackets.
Is my JSON uploaded?
No. Formatting and validation happen locally in your browser.
Can I use keyboard shortcuts?
Yes. Press Ctrl+Enter or Cmd+Enter in the input box to format the JSON.