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JSON Formatter

Format, minify, and validate JSON in your browser. Nothing is sent to a server.

LocalProcessed locally — your JSON never leaves your browser.

Available actions: copy, clear, paste, download.

JSON to format
Formatted result
Paste or type JSON to get started. Use Load example for a sample object.

How to use

  1. 1. Paste or type JSON

    Put JSON into the input panel. Use Paste, or Load example for a sample object. The JSON formatter never uploads what you type.

  2. 2. Format, minify, or validate

    Format pretty-prints JSON with 2-space indentation (JSON beautifier). Minify removes extra whitespace. Validate checks syntax without changing the output. Press Ctrl+Enter or Cmd+Enter to format.

  3. 3. Copy or download the result

    Copy formatted JSON, or download it as a .json file. Clear resets the workspace. Processing stays in your browser.

Examples

  • Pretty print compact JSON

    Input {"name":"John","age":30,"active":true} and choose Format. The JSON formatter returns an indented object you can read and diff.

  • Minify JSON

    Start from pretty-printed JSON and choose Minify to get a single compact line, useful for payloads and logs.

  • Validate JSON and find the error

    A trailing comma or a missing quote is invalid JSON. Validate (or Format) shows a clear message with the line and column when the browser or the fallback locator can determine it.

Frequently asked questions

Does this JSON formatter send my data to a server?
No. Format JSON, minify JSON, and validate JSON all run in your browser. Nothing is uploaded or stored.
What is the difference between format JSON and minify JSON?
Format JSON (pretty print / JSON beautifier) adds 2-space indentation and line breaks. Minify JSON removes unnecessary whitespace so the payload is smaller.
What happens if my JSON is invalid?
You get a readable error, not a stack trace. When possible, the tool shows the line and column of the first problem so you can fix it.
Can I format very large JSON?
Yes, within the browser. There is a recommended size limit. Very large input can slow or freeze the tab; the tool warns you as you approach that limit.

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