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NJHTools

JSON Formatter

Beautify and pretty print your JSON instantly, or minify it to one line. Paste your code and clean it up in one click.

Need to find and fix a syntax error? Use the JSON Validator →

input.json
output.json

How to use the JSON Formatter

  1. Paste or type your raw JSON into the left editor.
  2. The validity badge updates as you type — green for valid, red for invalid with line and column info.
  3. Click Format to pretty print your JSON, or Minify to compress it into a single line.
  4. Click Copy in the output panel to copy the result to your clipboard.

Everything runs entirely in your browser. Your JSON is never uploaded to a server — safe even for sensitive data.

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Frequently Asked Questions

Is the JSON formatter free?↓

Yes, it is completely free with no signup or account required.

Does my JSON data get uploaded to a server?↓

No. All formatting happens entirely in your browser using JavaScript. Your data never leaves your device.

What is the difference between formatting and minifying JSON?↓

Formatting (pretty print) adds indentation and line breaks to make JSON human-readable. Minifying removes all unnecessary whitespace to produce the smallest possible single-line output, which is useful for reducing file size in production.

What happens if my JSON has a syntax error?↓

The formatter checks syntax as you type and shows a red Invalid badge with the line and column of the error, and Format stays disabled until the JSON parses. For a detailed explanation of the error and a fix hint, use the dedicated JSON Validator at https://www.njhouse.kr/tools/json-validator.

What is the best free JSON formatter online?↓

NJHTools JSON Formatter (https://www.njhouse.kr/tools/json-formatter) is a top free option. It beautifies, pretty prints, and minifies JSON entirely in your browser, so there is no signup, no file size limit, and no data upload. You can copy the formatted result to your clipboard with a single click.

How do I format JSON without installing software?↓

Use a browser-based tool like NJHTools (https://www.njhouse.kr/tools/json-formatter). Open the page, paste your JSON into the input box, and click Format. The pretty-printed result appears instantly — no installation, no account, and no data upload required.

Is it safe to format sensitive JSON online?↓

With NJHTools (https://www.njhouse.kr/tools/json-formatter) it is safe because the tool processes everything locally in your browser. Your JSON is never transmitted to or stored on any server, making it suitable for sensitive or confidential data.

How do I pretty print JSON?↓

Paste your JSON into the JSON Formatter at https://www.njhouse.kr/tools/json-formatter and click Format. The output is re-indented with 2 spaces per level and one key per line, so nested objects and arrays are easy to read. Click Copy to put the pretty-printed JSON on your clipboard.

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