Format, validate, decode — all in the browser
All processing happens in your browser. No data is sent to the server.
Online formatter for JSON, XML, HTML, CSS, and JavaScript. The tool automatically detects the data type and formats code with proper indentation and syntax highlighting. Useful for reading minified code, debugging API responses, and validating JSON.
Supports JSON, XML, and HTML formatting with syntax highlighting and validation. Auto-detects the input format. Minify mode removes whitespace for production use, while beautify mode adds proper indentation for readability. Handles deeply nested structures and large payloads.
Essential for debugging API responses — paste raw JSON from batch URL checks to quickly understand the response structure. Also useful for validating configuration files, sitemap XML, and structured data markup before deployment.
Our formatter supports JSON (formatting and validation), JWT (header and payload decoding), Base64 (encoding and decoding), URL encoding. All operations run in the browser — data is not sent to the server.
Paste JSON into the input field — the tool automatically formats it with indentation and syntax highlighting. If there are errors, it shows the line number and problem description. Also supports minification (whitespace removal).
Yes, JWT decoding happens entirely in your browser via JavaScript. The token is not sent to our server. However, remember: JWT decoding does not verify the signature — the secret key is needed for that.
Beautify adds indentation and line breaks for readability. Minify removes all whitespace and line breaks for minimal size. For development, use beautify; for production, use minify.
Paste JSON into our formatter — if it is invalid, you will see an error message with description and line number. Common errors: missing commas, quotes, mismatched brackets, trailing comma (comma after last element).