JSON Formatter & Validator

Format, minify, and validate JSON while keeping parse errors visible.

Raw JSON

Formatted Output

JSON formatter and validator

Paste JSON here to make it readable, check whether it is valid, or shrink it into one line. This helps when an API response or config file is hard to read.

You can switch between 2 spaces, 4 spaces, and minified output.

Format API responses for reading
Find JSON syntax errors quickly
Minify JSON before saving or sending it
Clean up config files before sharing them

Validation

Invalid JSON usually comes down to a missing comma, trailing comma, unquoted key, or mismatched bracket. The validator shows the parse error so you can fix the input before formatting or minifying it.

Minified JSON

Minify means removing spaces and line breaks that people use for reading. The data stays the same, but the text becomes smaller.

Useful when

Debugging API responses
Formatting JSON configuration files
Validating JSON syntax before deployment
Preparing JSON examples for docs
Comparing JSON structures

How to use JSON Formatter & Validator

Use the JSON formatter when a response, config file, or copied object is hard to read. It formats valid JSON and shows parse errors when the input is broken.

Developers often use this page when they need json formatter, json format, json beautifier, and online json formatter.

Privacy and data handling

This tool is designed to run in your browser for normal use, so your input does not need to be sent to a server.

Input and output stay on the page while you work.
Copy buttons use your browser clipboard permission when available.
Avoid pasting private production data on shared or untrusted devices.

Examples

Format a compact JSON object

Input

{"name":"Ada","roles":["admin","editor"],"active":true}

Output

{
  "name": "Ada",
  "roles": [
    "admin",
    "editor"
  ],
  "active": true
}

This is the common case: a one-line API response becomes easier to read.

Find a JSON syntax error

Input

{"name":"Ada","active":true,}

Output

Unexpected token } in JSON at position 28

A trailing comma is valid in some JavaScript objects, but it is not valid JSON.

Steps

1Paste raw JSON into the input box.
2Choose two spaces, four spaces, or minified output.
3Fix any parse error, then copy the formatted result.

Common use cases

Read API responses from logs or browser devtools.
Validate JSON before adding it to a config file.
Minify JSON before storing it in a small field.

Practical tips

Common errors include trailing commas, missing quotes, and mismatched brackets.
JSON keys must use double quotes.
Do not paste private tokens or production secrets unless you have to.

FAQ

What makes JSON invalid?

Missing commas, trailing commas, unquoted keys, single quotes, and broken brackets are common reasons JSON fails to parse.

What is the difference between format and minify?

Format adds spaces and line breaks for reading. Minify removes extra whitespace so the JSON text becomes smaller.