How do I format and beautify JSON?

Paste your minified or unformatted JSON into JsonMint's input panel and click Format. JsonMint applies 2-space indentation, sorts arrays and objects consistently, and applies full syntax highlighting — strings in green, numbers in orange, booleans in blue, null in red. The formatted output appears instantly in the right panel with a copy button.

How do I validate JSON?

Paste your JSON into JsonMint and it validates automatically on paste. Valid JSON shows a green ✅ Valid JSON status bar. Invalid JSON shows a red ❌ error with the exact line number and column where the error occurred, plus a description (e.g., 'Expected comma or closing brace at Line 14, Column 8'). Common errors include missing commas, unquoted keys, and trailing commas.

What is the difference between JSON and XML?

JSON uses a compact key-value syntax that is native to JavaScript, easier to read, and smaller in file size. XML uses verbose opening and closing tags, supports attributes and namespaces, and has stronger schema validation tools (XSD). JSON is preferred for web APIs and modern applications; XML is still common in enterprise systems, SOAP services, and document formats like HTML and SVG.

What is JSONPath and how do I use it?

JSONPath is a query language for JSON similar to XPath for XML. Key expressions: $ = root, . = child, .. = recursive descent, [] = array index, [*] = all elements. Example: $.store.book[*].author returns all author values from a books array. JsonMint's JSONPath tab lets you paste JSON, enter a JSONPath expression, and see all matching values highlighted instantly.

How do I convert JSON to CSV?

In JsonMint's JSON↔CSV tab, paste a JSON array of objects (e.g., [{"name":"Alice","age":30},{"name":"Bob","age":25}]) and click Convert to CSV. JsonMint extracts the keys as column headers and maps values into rows. Nested objects are flattened using dot notation (address.city). Download the result as a .csv file or copy to clipboard.

What are common JSON errors and how do I fix them?

The most common JSON errors are: (1) Missing quotes around keys — JSON requires double-quoted keys: {"key": "value"} not {key: "value"}. (2) Trailing commas — JSON does not allow a comma after the last item in an array or object. (3) Single quotes — JSON requires double quotes, not single quotes. (4) Undefined or NaN values — JSON only supports null, not JavaScript's undefined or NaN. JsonMint highlights the exact error location to fix these instantly.

How do I minify JSON?

In JsonMint's Minifier tab, paste your formatted JSON and click Minify. JsonMint removes all whitespace, indentation, and line breaks to produce the most compact valid JSON representation. This is essential for API responses, reducing bandwidth, and embedding JSON in URLs or headers. JsonMint shows the original vs. minified size and percentage reduction.

Is my JSON data private when using JsonMint?

Completely private. JsonMint processes all JSON formatting, validation, conversion, and querying entirely within your browser using JavaScript. No JSON data is ever sent to any server, stored in any database, or accessible to us. You can safely use JsonMint with API responses containing sensitive data, proprietary schemas, or confidential configuration files.

JsonMint – Free JSON Formatter, Validator & Beautifier

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The Developer's Essential JSON Toolkit

Developers spend an average of 23 minutes per day manually reading and debugging JSON. JsonMint eliminates that friction with instant formatting, precise error location, collapsible tree navigation, and one-click conversion between JSON and other formats. Whether you're debugging an API response, validating a configuration file, or converting data for a spreadsheet, JsonMint gives you the right tool immediately — no installation, no authentication, no waiting.

Unlike browser extensions that require permissions or desktop tools that need installation, JsonMint runs 100% in your browser tab. Paste your JSON, get your answer, and move on — in under 5 seconds. Your data never leaves your machine, making it safe for proprietary APIs, customer data, and internal configuration files.

JSON vs Other Data Formats — Quick Reference

Format	Syntax Style	Best For	Avg File Size vs JSON
JSON	{"key":"value"}	REST APIs, configs, NoSQL	Baseline (1×)
XML	<key>value</key>	Enterprise, SOAP, documents	2–3× larger
CSV	col1,col2\nval1,val2	Tabular data, spreadsheets	0.5–1× (flat data)
YAML	key: value	Config files, CI/CD (GitHub Actions)	0.8–1.2× (similar)
TOML	[section]\nkey = "val"	Config files (Rust, Hugo)	0.9–1.3×
Protobuf	Binary (not human-readable)	High-performance APIs, gRPC	0.2–0.5× (binary)

Frequently Asked Questions

JSON (JavaScript Object Notation) is a lightweight text-based data format using key-value pairs and arrays. It's the dominant format for REST APIs, configuration files, NoSQL databases (MongoDB, Firebase), and browser-server data exchange. Example: {"name":"Alice","age":30,"active":true}

Top 5 JSON errors: 1. Unquoted keys — must be {"key":"val"} not {key:"val"}. 2. Trailing commas — [1,2,3,] is invalid. 3. Single quotes — JSON requires double quotes only. 4. undefined or NaN values — use null instead. 5. Comments — JSON does not support // comments (use JSONC for that). JsonMint shows the exact line and column for each error.

Go to JsonMint's JSON↔CSV tab. Paste a JSON array of objects — e.g. [{"name":"Alice","age":30},{"name":"Bob","age":25}]. Click Convert to CSV. JsonMint extracts keys as headers and values as rows. Nested objects are flattened with dot notation (address.city). Download as .csv or copy to clipboard.

JSONPath queries JSON like XPath queries XML. Key syntax: $ = root object, . = child, .. = any depth, [*] = all array items, [0] = first item. Example: $.users[*].email returns all email values from a users array. Use JsonMint's JSONPath tab to run queries and see results highlighted.

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Free JSON Formatter, Validator & Beautifier

Format & Beautify JSON Instantly

Convert, Query, Compare & Minify

Free JSON Formatter & Validator — JsonMint

The Developer's Essential JSON Toolkit

JSON vs Other Data Formats — Quick Reference

Frequently Asked Questions

More Free Developer Tools

Free JSON Formatter, Validator & Beautifier

Format & Beautify JSON Instantly

Convert, Query, Compare & Minify

Free JSON Formatter & Validator — JsonMint

The Developer's Essential JSON Toolkit

JSON vs Other Data Formats — Quick Reference

Frequently Asked Questions

More Free Developer Tools

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