Free JSON Formatter / Minifier
for readable and compact JSON.
Format, validate, and minify JSON instantly with this free online JSON tool. No accounts. No uploads. No telemetry.
JSON input
Formatted output
{
"user": {
"name": "Alice",
"roles": [
"admin",
"editor"
]
},
"active": true,
"meta": {
"city": "Montreal",
"score": 42
}
}Supported
- JSON formatting and beautifying
- JSON minifying
- Validation through JSON parsing
- 2-space and 4-space indentation
- Instant browser-based conversion
Automatically handled
- JSON syntax validation
- Pretty printing with configurable indentation
- Compact output generation for minified JSON
- One-click copy for formatted or minified output
Not supported yet
- JSON key sorting
- Trailing comma cleanup
- JSON5 support
- Large file upload mode
- Tab indentation
Free online JSON formatter and minifier
This tool works as a JSON formatter, a JSON minifier, and a quick way to validate JSON before using it in apps, APIs, config files, or debugging workflows.
You can beautify compact JSON to make it readable, or minify formatted JSON into a single-line version for transport, storage, embedding, or cleaner logs.
Developers often use JSON formatting when inspecting API responses, editing configuration files, debugging webhook payloads, or cleaning up fixture data.
Everything runs locally in your browser, so your JSON is not uploaded or stored anywhere.
Example
{"user":{"name":"Alice","roles":["admin","editor"]},"active":true}Paste compact JSON to format it for readability, or switch to minify mode to compress formatted JSON into a single line.
Format JSON online or minify JSON instantly
Use this tool to quickly format JSON with readable indentation or minify JSON into a compact version directly in your browser.
Common use cases
- Beautify API responses for easier inspection
- Minify JSON before embedding it in code or requests
- Validate JSON syntax before using it in applications
- Clean up config files, fixtures, and webhook payloads
How it works
In format mode, the tool parses your JSON and reprints it with configurable indentation using JSON.stringify(). In minify mode, it removes all unnecessary whitespace and returns a compact version.
If the input contains invalid JSON syntax, the tool shows the parse error so you can quickly fix the problem.
The conversion happens entirely client-side for speed and privacy.
Why use a JSON formatter?
Raw JSON is often hard to read when it comes from APIs, logs, exports, or compressed payloads. Formatting it with indentation makes objects, arrays, and nested values much easier to inspect.
A JSON minifier does the opposite by removing unnecessary whitespace, which helps when you want compact output for transport, embedding, or storage.
FAQ
What is a JSON formatter / minifier?
A JSON formatter / minifier lets you beautify JSON for readability or compress it into a compact single-line version.
Does this tool validate JSON?
Yes. The tool parses the input and shows an error if the JSON is invalid.
Is this JSON formatter safe?
Yes. Everything runs in your browser and your JSON is not uploaded.
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