JSON Formatter
Format, validate, and minify JSON with precise, human-readable error locations. Fast, local, and safe for sensitive data.
Processed locally in your browser — nothing is uploaded.
JSON Formatter
0 characters
Formatted JSON
Output appears here…About JSON Formatter
Paste JSON and get it validated and formatted instantly. Errors point at the exact line and column with a hint about what's likely wrong — a missing comma, an unquoted key, a trailing comma — instead of a cryptic parser message.
Choose 2-space, 4-space, or tab indentation, or minify to a single line for transport.
Common uses
- Make an API response readable
- Find the syntax error in a config file
- Minify JSON before embedding it somewhere compact
Example
Input
{"name":"Ada","tags":["math","computing"]}Output
{
"name": "Ada",
"tags": [
"math",
"computing"
]
}Frequently asked questions
Is my JSON sent to a server when I format it?
No. Parsing and formatting run entirely in your browser with JavaScript's built-in JSON functions, so API responses or configs containing real user data never leave your device.
What's the difference between beautify and minify?
Beautifying adds indentation and line breaks so humans can read the structure; minifying strips all insignificant whitespace onto one line to make the payload smaller. Both produce exactly the same data — only the whitespace changes.
Why is my JSON invalid when it looks fine?
The usual culprits are single quotes instead of double quotes, unquoted keys, trailing commas, or comments — all legal in JavaScript but forbidden in JSON. This tool points at the exact line and column and names the likely cause.
Does sorting keys change what the JSON means?
No. The JSON specification treats object member order as insignificant, so sorting keys alphabetically only changes how the text reads, not what any compliant parser sees. It's mainly useful for diffing two documents.