Learn how to format minified JSON into readable indented output, validate JSON syntax, and fix common JSON errors.
Step-by-Step Guide
Understand JSON basics
JSON (JavaScript Object Notation) uses key-value pairs in objects ({}) and ordered lists in arrays ([]). Keys must be double-quoted strings. Values can be strings, numbers, booleans, null, objects, or arrays.
Format JSON with our tool
Paste your raw or minified JSON into the JSON Formatter. Click Format to get properly indented, human-readable output with 2-space or 4-space indentation.
Validate syntax errors
Common errors: trailing commas (not allowed in JSON), single quotes instead of double quotes, unquoted keys, and comments (not allowed). The formatter highlights the line with the error.
Minify JSON for production
Minified JSON removes all whitespace to reduce file size. Use the Minify option to compress your JSON for APIs or storage. Our tool toggles between formatted and minified views.
Use keyboard shortcuts
Most JSON formatters support Ctrl+Shift+F (or Cmd+Shift+F) to auto-format. In VS Code, right-click → Format Document to format JSON files directly in the editor.
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Frequently Asked Questions
Q: What is the difference between JSON and JSONP?
A: JSONP (JSON with Padding) is an old technique for cross-origin requests that wraps JSON in a function call. It is largely obsolete now—CORS headers are the modern solution.
Q: Why does JSON not allow trailing commas?
A: JSON was designed to be a strict, simple format. Trailing commas are a JavaScript convenience but were excluded from the JSON spec to ensure simplicity and compatibility across parsers.
Q: How do I convert JSON to CSV?
A: Flatten your JSON array of objects and map each key to a column. Our tool focuses on formatting; for JSON-to-CSV conversion, use a dedicated converter tool.