JSON Viewer and Formatter

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data interchange format. It's the standard for APIs, configuration files, and data storage across the web. JSON uses key-value pairs and arrays, making it human-readable and easy to parse programmatically.

How to Use This JSON Formatter

1. Paste your raw or minified JSON into the input area
2. The tool automatically validates and formats the JSON
3. View the output as a formatted tree or beautified text
4. Copy the formatted result with one click

Common JSON Errors and How to Fix Them

• Trailing commas: JSON does not allow trailing commas after the last item in an array or object. Remove the comma before ] or }.
• Single quotes: JSON requires double quotes for strings. Replace 'value' with "value".
• Unquoted keys: Object keys must be strings in double quotes: {"name": "value"}, not {name: "value"}.
• Comments: JSON does not support comments. Remove any // or /* */ lines.
• Missing commas: Every element except the last needs a comma separator.

JSON vs Other Data Formats

• JSON vs XML: JSON is more compact and easier to read. XML supports attributes, schemas, and namespaces — better for document-centric data. JSON dominates for APIs.
• JSON vs YAML: YAML is more human-friendly (no braces, uses indentation). YAML supports comments. YAML is preferred for config files (Docker Compose, Kubernetes). JSON is preferred for data exchange.
• JSON vs CSV: CSV is simpler for flat tabular data. JSON handles nested and hierarchical data that CSV cannot represent.

JSON Best Practices for Developers

• Use consistent indentation (2 or 4 spaces) for readability
• Use camelCase for keys in JavaScript ecosystems, snake_case for Python/Ruby
• Keep JSON payloads small — remove unnecessary whitespace in production (minify)
• Validate JSON against a schema (JSON Schema) when building APIs
• Use null for missing values instead of omitting keys, for consistency