JSON Formatter
Validate, format, and minify JSON with error highlighting
Enter JSON and click Format or Minify
All processing happens locally in your browser. No data is sent to any server.
About JSON Formatter
Format, validate, and minify JSON data instantly in your browser. JSON (JavaScript Object Notation) is the most widely used data interchange format in modern APIs, configuration files, and databases. This formatter helps developers quickly beautify minified JSON for readability, validate JSON syntax to catch errors before deployment, and minify formatted JSON to reduce payload size. You can control indentation depth and optionally sort object keys for consistent output. All processing runs locally — your JSON payloads, API responses, and configuration data are never transmitted to a server.
How to Use JSON Formatter
- Paste your JSON into the input area.
- Click Format to beautify the JSON with proper indentation, or Minify to compress it.
- Optionally enable Sort Keys to alphabetically order object keys.
- Adjust the indentation level (2 or 4 spaces) to match your project style.
- Copy the formatted result using the copy button.
JSON Formatter FAQ
How do I format JSON online?
Paste your JSON into the input area and click Format. The tool instantly beautifies it with proper indentation. You can choose 2-space or 4-space indentation and sort keys alphabetically.
Will invalid JSON be detected?
Yes. The formatter validates your input and displays specific error messages with location details so you can find and fix syntax issues quickly.
Can I minify JSON to reduce file size?
Yes. Click Minify to strip all whitespace and produce the most compact valid JSON. This is useful for reducing API payload sizes and config file footprints.
Does sorting keys change the data?
No. Sorting keys reorders object properties alphabetically but preserves all values. This is useful for creating deterministic output for diffs, hashing, or version control.
Is my JSON data sent to a server?
No. All formatting, validation, and minification happens locally in your browser. Your data never leaves your device.