Developer Tools
~/json-formatter
// Format, validate, and minify JSON instantly in your browser. No data sent to server.
Beautify
Converts minified or messy JSON into a human-readable indented format.
Validate
Instantly checks if your JSON is valid and shows the exact error location.
Minify
Strips all whitespace to produce the smallest possible JSON string.
// FAQ
Is my data safe?
Yes. All processing happens entirely in your browser using JavaScript. No data is ever sent to our servers.
What JSON versions are supported?
This tool supports standard JSON (RFC 8259). JSON5 or comments are not supported - use standard double-quoted keys and values.
What is JSON minification?
Minification removes all unnecessary whitespace and newlines from JSON, reducing file size for use in APIs or storage.
What does "beautify" mean for JSON?
Beautifying (also called pretty-printing) adds consistent indentation and line breaks to make the JSON structure human-readable. It does not change the data itself.
Why does my JSON show a validation error?
Common causes include trailing commas, single-quoted strings, unquoted keys, or comments inside the JSON. Standard JSON requires double quotes and no trailing commas.
Can I format large JSON files?
Yes, though very large payloads (tens of MB) may be slow depending on your browser and device. For most API responses and config files, it handles them instantly.
// Common Use Cases
Debugging API responses
Paste a raw API response and format it instantly to inspect the structure and find unexpected fields.
Validating config files
Check that your appsettings.json, package.json, or any other JSON config file is syntactically correct before deploying.
Minifying for production
Strip whitespace from JSON payloads before embedding them in HTML or sending over the wire to reduce payload size.
Reading minified output
Take compressed JSON from a log or network tab and beautify it so you can actually read what is inside.