JSON, YAML & XML Converter

JSON Formatter, Minifier & Converter lets you format, minify, and convert JSON in real-time. JSON (JavaScript Object Notation) is the most widely used data interchange format for web APIs, configuration files, and data storage. This tool validates your JSON syntax as you type and highlights errors instantly.

Paste formatted JSON on the top-left to minify it, or paste minified JSON on the top-right to beautify it. The tool also converts between JSON, YAML, and XML in real-time — edit any panel and all others update automatically. Choose between standard and compact formatting styles.

YAML is popular for configuration files (Docker Compose, Kubernetes, CI/CD pipelines) because it supports comments and is more human-readable. XML remains essential for enterprise systems, SOAP APIs, and document formats. This tool makes converting between all three formats effortless.

All processing happens entirely in your browser — your data never leaves your device. Compare formats in our JSON vs YAML and JSON vs XML guides. Scroll down for syntax tips and detailed documentation.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format defined in RFC 8259. Despite its JavaScript origins, JSON is language-independent and supported by virtually every programming language. It supports six data types: strings, numbers, booleans, null, arrays, and objects.

JSON has become the dominant format for web APIs, configuration files, and data storage. Its simplicity and wide support make it the default choice for data exchange between clients and servers.

Formatting vs. Minification

Formatting (also called “pretty-printing” or “beautifying”) adds indentation and line breaks to make JSON human-readable. This is essential when debugging API responses, reviewing configuration files, or collaborating with teammates. Most developers work with formatted JSON during development.

Minification removes all unnecessary whitespace, newlines, and indentation. The result is a single compact line that is smaller in bytes. Minified JSON is ideal for network transmission, production configs, and storage where readability is not needed. A large API response can shrink by 20–40% after minification.

JSON vs. YAML

YAML (“YAML Ain’t Markup Language”) is a superset of JSON designed for human readability. YAML uses indentation instead of braces and supports features like comments, multi-line strings, and anchors. It is popular for configuration files (Docker Compose, Kubernetes manifests, GitHub Actions, CI/CD pipelines).

When choosing between them: use JSON for APIs and data exchange (strict syntax, universal parsing), use YAML for configuration files where humans edit the data directly (more readable, supports comments). Be aware that YAML’s implicit typing can cause surprises — values like yes, no, on, and off are interpreted as booleans.

JSON vs. XML

XML (eXtensible Markup Language) predates JSON and is still widely used in enterprise systems, SOAP APIs, RSS/Atom feeds, and document formats (DOCX, SVG). XML supports schemas (XSD), namespaces, attributes, and XSLT transformations — features JSON lacks.

JSON is generally preferred for new projects because it is smaller, faster to parse, and maps directly to native data structures in most languages. XML remains the right choice when you need document validation, mixed content (text and markup), or must integrate with legacy systems that require it.

Common JSON Syntax Errors

  • Trailing commas: {"a": 1,} — JSON does not allow trailing commas after the last element.
  • Single quotes: {'key': 'value'} — JSON requires double quotes for strings.
  • Unquoted keys: {key: "value"} — all keys must be quoted strings.
  • Comments: JSON does not support // comments or /* block comments */.
  • Missing values: {"a": } — every key must have a value.

Working with JSON in Web Development

In JavaScript, JSON.parse() converts a JSON string into a native object, and JSON.stringify() converts an object back to a JSON string. The optional space parameter in JSON.stringify(obj, null, 2) produces formatted output with 2-space indentation.

When working with APIs, always validate JSON responses before processing. Use try/catch around JSON.parse() to handle malformed responses. For TypeScript projects, define interfaces for your JSON structures to get compile-time type checking.

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