Does this send my JSON to a server?

No. Formatting happens entirely in your browser using JSON.parse and JSON.stringify — your JSON is never uploaded or logged.

What happens if my JSON is invalid?

You'll see the parser's error message along with the line and column it occurred at, so you can find and fix the problem quickly.

Can I use a tab instead of spaces?

Yes — the indentation dropdown includes a tab option alongside 2, 4, and 8 spaces.

JSON Tools

JSON Formatter

Format minified or messy JSON into readable, indented output, with clear syntax-error reporting including line and column when something doesn't parse.

Indentation

Formats as you type

Input JSON

Formatted output

JSON Validator

Check whether JSON is valid, with a precise error location.

JSON Beautifier

Reformat JSON with your choice of indentation.

JSON Viewer

Browse JSON as a collapsible, searchable tree.

JSON Minifier

Strip whitespace from JSON and see the size reduction.

Features

Pretty-prints JSON with 2, 4, 8-space, or tab indentation
Validates as you type and reports the exact line and column of a syntax error
Copy or download the formatted result as a .json file
Clear the input, or Reset to also restore the default indentation

How to use

Paste or type your JSON into the input box.
Pick an indentation size from the dropdown.
The formatted result appears on the right automatically.
Copy it to your clipboard or download it as a file.

Example

Input

{"id":1,"name":"Ada","tags":["dev","admin"]}

Output (2 spaces)

{
  "id": 1,
  "name": "Ada",
  "tags": [
    "dev",
    "admin"
  ]
}

FAQ

Does this send my JSON to a server?: No. Formatting happens entirely in your browser using JSON.parse and JSON.stringify — your JSON is never uploaded or logged.
What happens if my JSON is invalid?: You'll see the parser's error message along with the line and column it occurred at, so you can find and fix the problem quickly.
Can I use a tab instead of spaces?: Yes — the indentation dropdown includes a tab option alongside 2, 4, and 8 spaces.