OmniTools360*

JSON Formatter & Validator

developer toolsAIR-GAPPED

Beautify, minify, validate, and debug JSON with syntax error checking.

About JSON Formatter & Validator

The OmniTools360 JSON Formatter beautifies, minifies, and validates JSON data directly in your browser. Paste your JSON, and the tool reformats it with 2 or 4 space indentation or compresses it into one line. If the JSON is invalid, it shows the error message.

How does the JSON Formatter & Validator work?

The tool uses the browser's built-in JSON parser to read your text. If parsing works, it writes the data back with the indentation you chose, or with no spaces for minify. If parsing fails, it shows the parser's error message below the editor.

Explanation

JSON (JavaScript Object Notation) is a text format for data. It uses objects in curly braces {} with "key": value pairs, and arrays in square brackets []. Keys and strings must use double quotes. Trailing commas and comments are not allowed. Formatting only changes spaces and line breaks, not the data.

How to use the JSON Formatter & Validator

1

Paste your JSON into the editor box.

2

Click Format (2 spaces) or Format (4 spaces) to beautify it.

3

Click Minify to remove all extra spaces and line breaks.

4

Click Validate to check for syntax errors.

5

Click Copy to copy the result, or Clear to start again.

JSON Formatter & Validator examples

Minified to formatted
{"name":"Ana","age":30} with Format (2 spaces) becomes three lines: {, then "name": "Ana", "age": 30 on separate indented lines, then }.
Formatted to minified
A multi-line object with "active": true becomes {"active":true} after Minify.
Invalid JSON caught
{'name': 'Ana'} fails validation because JSON requires double quotes, not single quotes. The tool shows the parser error.

Frequently Asked Questions about JSON Formatter & Validator

How do I format JSON online?

To format JSON online, paste it into the editor and click Format (2 spaces) or Format (4 spaces). The tool adds line breaks and indentation so the structure is easy to read. It works in your browser, so your data is not uploaded. Click Copy to use the formatted result.

How do I know if my JSON is valid?

Click Validate after pasting your JSON, and the tool tells you whether it is valid. If there is a problem, it shows the error message from the browser's JSON parser. Common mistakes are single quotes, trailing commas, missing quotes around keys, and comments, which standard JSON does not allow.

What is the difference between minify and beautify JSON?

Beautify adds spaces and line breaks to make JSON easy for people to read, while minify removes them to make the file as small as possible. Both keep the exact same data. Use beautified JSON for reading and debugging, and minified JSON for sending data over a network or saving space.

Why is my JSON invalid?

JSON is usually invalid because of a small syntax error. The most common causes are single quotes instead of double quotes, a comma after the last item, keys without quotes, comments, or missing brackets. Values like undefined or NaN are also not allowed. The Validate button shows the error message to help you find it.

Is it safe to paste JSON into an online formatter?

It is safe with this tool because the formatting runs entirely in your browser. Your JSON is processed by your own device and is not sent to a server. Still, as a good habit, avoid pasting passwords, API keys, or private tokens into any website you do not trust.

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