Minify removes all whitespace to make the JSON as small as possible, which is useful for sending it over a network or storing it compactly.

JSON Formatter & Validator

Input JSON

Output

How the JSON formatter works

Paste your JSON and the tool checks it as you type, showing a green tick if it is valid or the exact error if it is not. Click Format to pretty-print it with clean indentation, or Minify to strip all whitespace into one compact line. Everything runs in your browser, so your data stays completely private.

Example

Input: {"a":1,"b":[2,3]} → Formatted adds line breaks and two-space indentation so it is easy to read.

Key features

Beautify / pretty-print JSON with proper indentation
Minify JSON to a single compact line
Live validation with clear error messages
Copy the result with one click; nothing is uploaded

When to use it

Reading messy API responses
Fixing a JSON syntax error
Shrinking JSON before sending or storing it
Tidying config files and data snippets

Frequently asked questions

Why is my JSON not valid?

Common causes are missing commas, trailing commas, single quotes instead of double quotes, or unclosed brackets. The validator shows the exact error message.

Is my data sent to a server?

No. Formatting and validation happen entirely in your browser, so your JSON never leaves your device.

What does minify do?

Minify removes all whitespace to make the JSON as small as possible, useful for sending it over a network or storing it compactly.