JSON Formatter
Format, minify, and validate JSON data with syntax highlighting, keeping raw data readable or ready for efficient transfer. GDPR-compliant.
Your inputs are processed in your browser and are not transmitted to our servers. Note: third-party resources (e.g. advertising and analytics from Google/Cloudflare) and an optional PayPal donation link may transfer data when loading or when clicked. Browser extensions or plugins may be able to read content that is visible in the input fields.
The result will appear here …
How to use this tool (video)
This video is hosted on YouTube. When you play it, data may be sent to Google.
JSON Formatter, Minifier, and Validator: Free Online Tool
JSON is used for APIs, configuration files, and data exports. This browser-based tool formats JSON for readability, minifies it for compact transfer, and checks syntax without sending your data to a server.
Format JSON
Add indentation and line breaks to make nested objects and arrays easier to inspect. Syntax highlighting separates keys, values, numbers, and booleans.
Minify and validate JSON
Minification removes unnecessary whitespace without changing the data. Validation catches missing commas, invalid quotes, trailing commas, and other syntax errors, with the relevant line and column.
Frequently asked questions
How do I format my JSON data?
Paste your JSON into the input field and click Format. The tool adds indentation and line breaks and colors keys, values, numbers and booleans with syntax highlighting to make the document easier to read.
What is the difference between formatting and minifying?
Formatting makes JSON readable with line breaks and indentation. Minifying removes all unnecessary whitespace without changing the data. That saves bandwidth, for example when embedding JSON in HTML or sending it over an API.
Why does the validator say my JSON is invalid?
Common causes are single instead of double quotes, a comma after the last element, missing closing brackets, or comments in the text. The validator shows the exact line and column of the error so you can fix it quickly.
Are comments allowed in JSON?
No. Standard JSON does not allow comments, neither with // nor with /* */. If your parser accepts them anyway, that is an extension. For standard JSON you must remove comments, otherwise the document is not valid.
Can I copy the formatted JSON directly?
Yes. After formatting you can copy the result into your clipboard with one click. This works for formatted and minified JSON alike.
Is my JSON data sent to a server?
No. Formatting, minifying and validating run entirely in your browser. Your data is not transmitted to our server and is not stored.