tofo-boxtools

JSON Formatter

json

Format, validate, minify, and sort JSON data instantly in your browser. Real-time output with error highlighting.

json formatterformat json onlinejson validatorbeautify jsonjson pretty printjson lint
Input JSON

168 B

Output (13 lines)

180 B

Keys: 7Depth: 2Minified: 131 B
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What is JSON Formatter?

JSON Formatter is a free online utility that helps developers and data professionals work with JSON data. Format, validate, minify, and sort JSON data instantly in your browser. Real-time output with error highlighting. JSON (JavaScript Object Notation) is the most widely used data interchange format on the web, and having a reliable tool to format and validate it saves significant time during development.

How to Use JSON Formatter

  1. 1

    Paste your JSON data into the left panel. You can paste minified, formatted, or even slightly malformed JSON.

  2. 2

    Select an action: Format to beautify with indentation, Minify to compress, Validate to check syntax, or Sort Keys to alphabetize.

  3. 3

    The output appears instantly in the right panel with real-time error highlighting if the JSON is invalid.

  4. 4

    Click Copy to copy the result to your clipboard, or use the stats bar to see key count, depth, and size savings.

Common Use Cases

  • →Debugging API responses — paste raw JSON from a network request to read it clearly.
  • →Code reviews — format JSON config files before committing to version control.
  • →Data validation — check if a JSON payload is valid before sending it to an API.
  • →Minifying JSON for production — reduce payload size in API responses.

Frequently Asked Questions

What is the difference between Format and Minify?

Format (beautify) adds indentation and line breaks to make JSON human-readable. Minify removes all whitespace to produce the smallest possible output, which is ideal for production API responses where bandwidth matters.

Can this tool fix invalid JSON?

The tool validates and highlights errors but does not auto-fix invalid JSON. Common issues include trailing commas, single quotes instead of double quotes, and unquoted keys — all of which are not valid JSON.

What does Sort Keys do?

Sort Keys reorders all object keys alphabetically at every nesting level. This is useful for comparing two JSON objects or for producing consistent, deterministic output from APIs.

Is my JSON data sent to a server?

No. This tool runs entirely in your browser using JavaScript. Your JSON data never leaves your device and is never sent to any server.

What is the maximum JSON size this tool can handle?

The tool handles JSON files up to several megabytes without issues. For very large files (50MB+), performance may slow down depending on your device's memory.

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🖼️
Image Tool

Try Image Compressor

Reduce image size up to 80% — free, instant, no upload needed.

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