> format | validate | minify <
// Format, validate, and minify JSON data instantly
Pretty Print
Beautify JSON with customizable indentation. Choose 2 spaces, 4 spaces, or tabs for perfect formatting.
Compact Output
Minify JSON by removing all whitespace. Reduce file size for production deployments and API responses.
Syntax Check
Validate JSON syntax instantly. Get detailed error messages with line and position information.
// ABOUT JSON FORMATTING
What is JSON:
JSON (JavaScript Object Notation) is a lightweight data interchange format defined by RFC 8259. It is easy for humans to read and write, and easy for machines to parse and generate. JSON is built on two structures: objects (key-value pairs) and arrays (ordered lists).
Example:
{"name":"John","age":30} → {\n "name": "John",\n "age": 30\n}
Common Use Cases:
- >API response debugging and inspection
- >Configuration file formatting
- >Data validation before processing
- >Reducing payload size with minification
- >Sorting keys for consistent output
>> frequently asked questions
Q: What does it mean to beautify JSON?
A: To beautify JSON means to reformat a raw or minified JSON string so a human can easily read and debug it. A beautifier adds line breaks between object properties and array items, indents nested levels with a consistent number of spaces or tabs, and aligns colons and commas. The underlying data is unchanged — {"a":1,"b":2} and the beautified multi-line version are semantically identical to any JSON parser.
Q: What is the difference between beautify, prettify, pretty print, and format?
A: These four terms all refer to the same operation — transforming compact JSON into indented, multi-line, human-readable JSON. Beautify is the term popularized by web tools. Prettify and pretty print come from the programming community (e.g., Python's json.dumps(indent=2) or JSON.stringify(obj, null, 2)). Format is the generic IDE term (VS Code, IntelliJ). There is no functional difference — they are interchangeable.
Q: What is a JSON formatter?
A: A JSON formatter (also called JSON beautifier or pretty printer) takes raw or minified JSON data and reformats it with proper indentation and line breaks, making it human-readable and easier to debug. A good formatter also validates the input and reports errors with line and column numbers.
Q: How do I beautify JSON online?
A: Paste your JSON into the INPUT area above and click [FORMAT]. The tool auto-detects the input, validates the syntax, and pretty prints it in the OUTPUT area with your chosen indentation (2 spaces, 4 spaces, or tab). Everything runs locally in your browser — your JSON is never sent to any server, so it is safe to beautify sensitive production data.
Q: What is the difference between prettify and minify?
A: Prettify (format/beautify) adds indentation, line breaks, and spaces to make JSON readable. Minify removes all unnecessary whitespace to reduce file size — ideal for production API responses, config bundles, and network transmission. A typical minified payload is 30–60% smaller than its beautified form.
Q: How does JSON validation work?
A: JSON validation checks whether the input conforms to the JSON specification (RFC 8259). It verifies proper syntax including matching brackets, correct quoting of keys and strings, valid data types, and proper use of commas and colons. Our validator reports the exact line and position where parsing failed so you can fix common issues like trailing commas, unquoted keys, single quotes, and comments (which are not allowed in strict JSON).
Q: What does sorting keys do?
A: Sorting keys alphabetically reorders all object keys in the JSON structure (including nested objects). This is useful for:
• diffing two JSON documents so the order of keys doesn't create noise
• deterministic hashing of JSON payloads (e.g., for signing or caching)
• canonical form output when you need reproducible builds
• reviewing config files where you want predictable property order
Q: What indentation should I use — 2 spaces, 4 spaces, or tabs?
A: There is no single correct answer, but 2 spaces is the most common default (used by npm, JSON.stringify's default pretty print, and most REST API docs). 4 spaces is preferred in Python-heavy environments. Tabs are sometimes chosen for smaller file size. Pick whichever your team and existing files already use, and stay consistent.
Q: Why is my JSON invalid?
A: The most common errors are:
• Trailing comma after the last item ({"a": 1,}) — not allowed in JSON
• Single quotes instead of double quotes ({'a': 1}) — JSON requires "
• Unquoted keys ({a: 1}) — keys must be quoted strings
• Comments (// ...) — standard JSON does not allow comments
• Undefined or NaN values — only null, numbers, strings, booleans, arrays, and objects are allowed
Our validator highlights the first syntax error it encounters.
Q: Is this JSON beautifier safe for sensitive data?
A: Yes. All parsing, beautifying, minifying, and validation happens entirely in your browser using the built-in JSON.parse and JSON.stringify APIs. Your JSON is never transmitted to any server, logged, or stored. You can safely beautify tokens, credentials, or confidential API responses.
Q: How does JSON compare to YAML?
A: JSON uses braces and brackets with strict syntax, while YAML uses indentation-based formatting. JSON is more widely supported in APIs and programming languages. YAML is more human-readable but more complex to parse. Both represent the same data structures. If you need to convert between them, see our JSON to YAML converter.