Input (JSON)
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Output
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Paste your raw, minified, or broken JSON into the editor above and instantly get clean, readable, indented output. Our free JSON formatter works entirely in your browser — no installation, no account, no waiting. Whether you're debugging an API response, cleaning up a config file, or just trying to understand a blob of JSON data, you're in the right place.
JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format that is easy for both humans and machines to read and write. Originally derived from JavaScript, JSON has become the universal standard for transmitting structured data across the web, used by virtually every REST API, configuration file, and modern database.
A valid JSON document is built from two core structures: objects (key-value pairs enclosed in curly braces {}) and arrays (ordered lists enclosed in square brackets []). Values can be strings, numbers, booleans (true or false), null, or nested objects and arrays.
{
"name": "John Doe",
"age": 30,
"isActive": true,
"address": {
"city": "New York",
"zip": "10001"
},
"tags": ["developer", "designer"]
}Despite its simplicity, JSON is strict about syntax. A single missing comma, an extra trailing comma, or unquoted key will make the entire document invalid — which is exactly why a JSON formatter and validator is an essential tool for any developer.
A JSON formatter (also called a JSON beautifier or JSON pretty printer) is a tool that takes raw or minified JSON text and restructures it into a clean, human-readable format with consistent indentation and line breaks.
When data is transmitted over a network or stored in a file, it's often minified — all whitespace is stripped to reduce size. This is efficient for machines but nearly impossible for humans to read at a glance. A JSON formatter reverses that process, adding proper indentation so you can instantly understand the structure of the data.
For example, this minified JSON:
becomes this after formatting:
{
"user": {
"id": 1,
"name": "Jane",
"roles": [
"admin",
"editor"
],
"active": true
}
}The data is identical — but the formatted version is instantly readable.
Paste any JSON and click Beautify to instantly transform it into neatly indented, structured output. You can choose between 2-space, 4-space, or 8-space indentation to match your team's coding style or your project's requirements.
Our built-in validator checks your input against the official JSON specification (RFC 8259) in real time. If your JSON contains syntax errors, the validator highlights the exact line and character with a descriptive error message.
Click Minify to strip all whitespace, line breaks, and indentation from your JSON, producing the smallest possible output. This is ideal for production environments where every byte counts.
The editor uses full syntax highlighting to color-code keys, values, strings, numbers, and booleans. This makes it much easier to visually scan complex, deeply nested JSON documents.
Convert JSON to XML, YAML, CSV / TSV, Java POJO, or Plain Text directly. Transform your data for legacy systems, spreadsheets, or documentation.
All formatting, validation, and conversion happens entirely on the client side. Your JSON data is never sent to our servers, stored, or logged.
Formatting JSON with our tool takes less than 10 seconds:
Copy your raw, minified, or malformed JSON and paste it into the input editor on the left side of the screen. You can also click "Open File" to upload a .json file directly.
Select your indentation preference (2, 4, or 8 spaces), then click one of the action buttons: Beautify, Minify, or Validate.
The formatted result appears instantly in the right-hand output panel with full syntax highlighting. Any errors will be shown with the exact location.
Click the copy button to copy the output to your clipboard, or use the download button to save it as a file. If you want to convert, select the target format first.
Even experienced developers make JSON syntax mistakes. Here are the most common errors our validator catches:
JSON does not allow a comma after the last element in an object or array.
In JSON, all object keys must be strings enclosed in double quotes.
JSON strictly requires double quotes for strings. Single quotes are not valid.
Every key-value pair and array element must be separated by a comma.
Every opening { or [ must have a corresponding closing } or ]. Deeply nested JSON is especially prone to this error.
Standard JSON does not support comments. You must remove them.
For example, true/false must be lowercase, and null must not be quoted.
Best for web APIs and data interchange. Compact, easy to parse, natively supported in JS. The standard for REST APIs.
More verbose, supports attributes and schemas (XSD). Preferred for legacy enterprise systems, SOAP, and complex documents.
Most human-friendly. Minimal syntax, easy to write. Go-to for configuration (Kubernetes, Docker). Indentation-sensitive.
While code editors like VS Code have JSON formatting built in, an online JSON formatter offers several advantages:
A tool that reformats raw or minified JSON text into a clean, indented, human-readable structure.
Yes, completely free. No account required, no usage limits.
Yes. It checks against RFC 8259 and highlights syntax errors with line numbers.
Beautify adds indentation for readability. Minify removes whitespace to reduce size.
Yes. Select CSV option and convert. Best for arrays of objects.
Yes. Paste or upload large files; the editor handles them efficiently.
Completely. Processing is client-side in your browser. No data is sent to servers.
Yes, it is fully responsive on iOS and Android.
Standard JSON (RFC 8259), including nested objects, arrays, and Unicode.
The validator pinpoints errors exactly, making manual fixes easy.
Scroll back to the top, paste your JSON, and get clean, readable output in one click. No ads. No signup. No distractions.