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JSON Formatter & Validator

Paste or drop JSON to pretty-print it with your preferred indentation, minify it for transport, or sort keys alphabetically. Invalid JSON is flagged with the exact line and column of the problem.

  • Runs in your browser
  • Free, no sign-up
  • No uploads

Input

0 chars0 lines0 B

Output

 

What is JSON Validation?

JSON (JavaScript Object Notation) is the standard format used by APIs to transmit data. However, JSON is extremely strict. A single missing quote or a trailing comma will completely break it.

JSON Validation is the process of checking your raw text against the official JSON specification. A validator will scan every character and highlight exactly which line is broken and why, saving you hours of frustrating debugging.

Common JSON Syntax Errors Explained

When working with JSON payloads, developers constantly run into the same common mistakes. Our JSON Formatter automatically catches these for you:

  • Trailing Commas: Unlike JavaScript objects, you cannot place a comma after the final item in a JSON array or object. This is the #1 most common error.
  • Single Quotes: JSON strictly requires " (double quotes) for all strings and object keys. Single quotes ' are completely invalid.
  • Missing Quotes on Keys: In JavaScript, object keys don't always need quotes. In JSON, every single key must be wrapped in double quotes.

How to read nested arrays

When API payloads get large, they often contain "nested arrays" (arrays inside of arrays inside of objects). Reading this when it is minified into a single line of text is impossible for a human.

By pasting your code into our JSON Formatter, we automatically add the correct line breaks and 2-space indentation (known as "beautifying"). This visually separates parent objects from their child arrays, allowing you to instantly understand the data structure hierarchy.

How to use the JSON Formatter & Validator

  1. 1

    Paste JSON into the input panel or drop a .json file onto it.

  2. 2

    Choose Format, Minify or Sort keys and pick an indentation size.

  3. 3

    Copy the result or download it as a .json file.

Features

Precise error reporting
Syntax errors show the line, column and a snippet of the offending text.
Format, minify, sort
Switch between readable output, compact output and alphabetically sorted keys.
Document stats
See the size, key count and nesting depth of your JSON at a glance.
Handles large files
Native JSON parsing keeps multi-megabyte documents fast.

Frequently asked questions

What does a JSON validator check?

It parses your text against the JSON specification (RFC 8259) and reports issues such as trailing commas, single quotes, unquoted keys or missing brackets.

Can I sort JSON keys alphabetically?

Yes. Use Sort keys to recursively order every object's keys, which makes diffs and code reviews much easier.

Are my JSON documents uploaded to a server?

No. All processing happens locally in your browser using JavaScript and WebAssembly. Your JSON documents never leave your device, and nothing is stored or logged.