Free Online JSON Formatter
Paste raw or minified JSON to instantly format it with proper indentation, or minify it for production. Errors are highlighted so you can fix them fast.
What is a JSON Formatter?
A JSON formatter (also called a JSON beautifier or pretty-printer) takes compact or poorly indented JSON and reformats it with consistent indentation and line breaks, making it easy to read and debug.
Our formatter also validates your JSON as it processes it, surfacing syntax errors with a clear message so you can pinpoint and fix issues quickly. Everything runs in your browser — no data is ever sent to a server.
How to Use the JSON Formatter
- Paste your JSON into the Input field on the left.
- Choose a mode: Format to beautify with 2 or 4 spaces, or Minify to strip all whitespace.
- Click the button to process. Any syntax errors are shown below the input.
- Copy the result with the Copy button and paste it wherever you need it.
Common Use Cases
- API debugging: Paste raw API responses to quickly scan the structure.
- Config file formatting: Keep your JSON config files readable and consistently indented.
- JSON validation: Instantly catch missing brackets, trailing commas, and other syntax mistakes.
- Production minification: Shrink JSON payloads before embedding them in source code or sending over the wire.
Frequently Asked Questions
Paste the JSON into the input field, select "Format", and choose 2- or 4-space indentation — the formatted result appears instantly with consistent line breaks and indentation.
Formatting (beautifying) adds indentation and line breaks to make JSON readable for humans. Minifying strips all unnecessary whitespace to produce the smallest possible file size — useful for production payloads sent over the network, where readability doesn't matter but every byte does.
It catches standard JSON syntax errors: missing or trailing commas, unquoted keys, single quotes instead of double quotes, unclosed brackets or braces, and other issues that make the input invalid JSON — with a message indicating what went wrong.
Just syntax — it confirms your input is valid JSON (correctly nested objects, arrays, strings, numbers, booleans, and null), not that it matches a specific schema or shape. For schema validation you'd need a dedicated JSON Schema validator.
It's completely free with no limits, and nothing is sent anywhere — formatting and validation happen entirely in your browser using JavaScript.