JSON Formatter – Beautify & Pretty Print JSON Online
A high-performance, strictly local JSON formatter and validator with beautiful syntax highlighting. Format or minify your JSON instantly.
JSON Formatter Pro
Instantly format, validate, minify, and beautifully highlight your JSON data locally in your browser.
Preview will appear here
Common Problems
How to format json online?
Standard JSON requires strict formatting. Common errors include: using single quotes (') instead of double quotes ("), having trailing commas at the end of objects or arrays, or forgetting to wrap keys in double quotes.
Pretty print json string?
JSON Formatter Pro is designed to do one thing exceptionally well: take raw JSON strings and instantly convert them into beautiful, readable, syntax-highlighted code.
Validate json online?
Yes. 100% of the parsing and formatting happens locally inside your browser using JavaScript. Your JSON data is never sent to any server.
Json syntax error checker?
Standard JSON requires strict formatting. Common errors include: using single quotes (') instead of double quotes ("), having trailing commas at the end of objects or arrays, or forgetting to wrap keys in double quotes. JSON Formatter Pro is designed to do one thing exceptionally well: take raw JSON strings and.
Minify json data?
Yes! Use the 'Minify' button. It will instantly remove all unnecessary whitespace and newlines, compressing the JSON into a single line.
Workflow
What is JSON Formatter – Beautify & Pretty Print JSON Online?
Working with unformatted, minified JSON data can be a headache. JSON Formatter Pro is designed to do one thing exceptionally well: take raw JSON strings and instantly convert them into beautiful, readable, syntax-highlighted code. It also doubles as a strict JSON validator.
How to use JSON Formatter – Beautify & Pretty Print JSON Online
Simply paste your raw JSON into the left panel. The tool will automatically validate the syntax and display a beautifully formatted, color-coded version in the right panel. You can adjust the indentation size, minify the data to save space, or copy the formatted result with a single click. Any syntax errors will be clearly indicated with a red banner.
Example
Before (Minified):
`{"user":"AIStacker","active":true,"roles":["admin","editor"]}`
After (Formatted with 2 spaces):
{
"user": "AIStacker",
"active": true,
"roles": [
"admin",
"editor"
]
}Use Cases
- Debugging API responses and webhook payloads.
- Reading complex configuration files (e.g., package.json, settings.json).
- Formatting minified JSON logs from production servers.
- Minifying JSON payloads before sending them to save bandwidth.
- Validating hand-written JSON to catch missing commas or quotes.
FAQ
Is my JSON data safe?
Yes. 100% of the parsing and formatting happens locally inside your browser using JavaScript. Your JSON data is never sent to any server.
Why is the tool rejecting my JSON?
Standard JSON requires strict formatting. Common errors include: using single quotes (') instead of double quotes ("), having trailing commas at the end of objects or arrays, or forgetting to wrap keys in double quotes.
Can I format JSON to be on a single line?
Yes! Use the 'Minify' button. It will instantly remove all unnecessary whitespace and newlines, compressing the JSON into a single line.