JSON Formatter & Validator
Format, validate, and beautify JSON instantly. Minify, sort keys, and fix errors — all client-side in your browser.
Client-side only — nothing leaves your browser
Valid JSON
11 keysdepth 3347 B
What is JSON Format?
JSON (JavaScript Object Notation) is a lightweight data format used for storing and exchanging data between servers and web applications. It is the standard format for REST APIs, configuration files, and NoSQL databases like MongoDB and CouchDB. JSON uses key-value pairs and ordered lists to represent structured data in a human-readable text format.
Features
- Format & Beautify — Pretty print with 2-space, 4-space, or tab indentation
- Validate — Instant syntax validation with error line and column
- Minify — Compress JSON by removing all whitespace
- Sort Keys — Alphabetically sort all keys, recursively
- Client-side — Your data never leaves your browser
Common JSON Errors & Fixes
| Error | Invalid | Valid |
|---|---|---|
| Single quotes | {'key': 'value'} | {"key": "value"} |
| Trailing comma | {"a": 1, "b": 2,} | {"a": 1, "b": 2} |
| Unquoted keys | {key: "value"} | {"key": "value"} |
| Comments | {"a": 1} // comment | {"a": 1} |
| Undefined/NaN | {"a": undefined} | {"a": null} |
| Unescaped newline | {"a": "line1 line2"} | {"a": "line1\nline2"} |
Frequently Asked Questions
What is a JSON formatter?
A JSON formatter takes raw or minified JSON data and reformats it with proper indentation and line breaks, making it human-readable. Also called a JSON beautifier or JSON pretty printer. This tool also validates your JSON and shows exact error locations if the syntax is invalid.
How do I validate JSON against a schema?
This tool validates JSON syntax (is it valid JSON?). For schema validation (does it match a specific structure?), you need a JSON Schema validator. JSON Schema lets you define required fields, data types, patterns, and constraints. Tools like ajv (JavaScript) or jsonschema (Python) handle schema validation.
Is this JSON formatter safe? Does it store my data?
Yes, this tool is completely safe. All formatting and validation happens client-side in your browser using JavaScript's built-in JSON.parse() and JSON.stringify(). Your data never leaves your browser — nothing is sent to any server. You can verify this in your browser's network tab.
Can I sort JSON keys alphabetically?
Yes — click the 'Sort Keys' button to alphabetically sort all keys in your JSON, including nested objects. This is useful for comparing JSON documents, creating consistent outputs, and making large objects easier to navigate. The sort is applied recursively to all nested levels.
How do I fix a JSON format error?
Paste your JSON into the input and the validator will show the exact line and column where the error occurs. Common JSON errors include: missing quotes around keys, trailing commas after the last item in an array or object, single quotes instead of double quotes, and unescaped special characters in strings.
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