Formatters & Viewers
Tidy, validate and inspect structured text. These tools turn messy JSON and HTML into something you can read and check.
- JSON Formatter & ValidatorFormat, minify and validate JSON online with line-accurate error messages.
- JSON DiffCompare two JSON documents and see every added, removed and changed value by path.
- HTML ViewerPaste HTML and see a live preview at mobile, tablet or desktop width, with scripts off until you allow them.
Choosing the right tool
Formatting makes structured text readable. Data that arrives on one long line, or markup written without indentation, is hard to scan and easy to get wrong. A formatter adds line breaks and indentation, and a validator tells you exactly where the syntax breaks, so you can fix a missing comma or an unclosed bracket in seconds instead of hunting for it.
Pick a formatter when you need to read or clean up a single document, a JSON comparer when you need to know what changed between two versions, and a viewer when you want to see how markup actually looks in a browser. Minifying does the opposite of formatting: it removes the whitespace so the data is smaller to send, which is useful just before you publish.
All of these tools run in your browser. The text you paste is never uploaded, which matters when it contains API responses, configuration or customer data.
Frequently asked questions
- What does formatting JSON do?
- It adds indentation and line breaks so the structure is easy to read, without changing the data. A formatter also checks the syntax and reports the line of any mistake.
- Is my data uploaded when I format or compare it?
- No. The work happens in your browser, and nothing you paste is sent to a server.
- What is the difference between formatting and minifying?
- Formatting spreads data out so people can read it. Minifying removes spaces and line breaks so the data is as small as possible. Both keep the same content.