JSON, XML & YAML Formatter & Minifier – Free Online Pretty Print Tool

Format, minify, and validate JSON, XML, and YAML — all in one tool, entirely in your browser. Paste any structured data and the tool auto-detects the format. Pretty-print with configurable indentation (2 spaces, 4 spaces, or tabs), or minify to a compact single-line output with the exact size reduction shown. For JSON, optionally sort all keys alphabetically (useful for diffs). Includes a Convert tab for JSON → YAML and JSON → XML transformations. Instant syntax error detection with detailed error messages. Perfect for developers, DevOps engineers, and anyone working with APIs, config files, or data pipelines.

Language

Operation

Indent

Extra

Examples:

How to Use the JSON, XML & YAML Formatter

Format & Minify tab:

  • Auto-detect: Paste any content — the tool detects JSON, XML, or YAML automatically.
  • Pretty Print: Adds indentation and newlines for maximum readability.
  • Minify: Strips all unnecessary whitespace. Shows the exact size reduction (%).
  • Indent size: Choose 2 spaces, 4 spaces, or tabs to match your project's style.
  • Sort keys A–Z (JSON): Recursively alphabetizes all object keys — great for diffing.
  • Validation: A green/red banner shows whether the input is valid and highlights the error message.

Convert tab — JSON to YAML / XML:

  • JSON → YAML: Converts any valid JSON object into properly indented YAML — handling nested objects, arrays, strings with special characters, null values, and booleans.
  • JSON → XML: Wraps valid JSON in an XML document with a <root> element, recursively serializing all object keys as elements and arrays as repeated sibling elements.