JSON Formatter
Beautify, minify and validate JSON with precise, line-aware error reporting.
{
"name": "devtools",
"version": "0.1.0",
"tools": [
"snowflake",
"uuid"
],
"meta": {
"free": true,
"signup": false
}
}How to use the JSON Formatter
Paste raw JSON to instantly beautify, minify and validate it. The browser’s native parser catches the first syntax error with a precise message, and the output is clean, copy-ready JSON in your chosen indent style.
- 01Paste your JSON into the input panel, or click sample to load an example.
- 02Pick an indent (2 spaces, 4 spaces or tabs), or toggle minify to strip all whitespace.
- 03Copy the result. A green valid badge confirms the JSON parsed without errors.
tips
- —JSON is strict: keys need double quotes, no trailing commas, and only double-quoted strings (single quotes are not allowed).
- —Minify before sending JSON over the network to shrink the payload; beautify it again when you need to read it.
- —The error message includes the character position — jump straight to that spot in your input to fix it.
frequently asked
Is my JSON sent to a server?+
No. Parsing and formatting happen entirely in your browser with the native JSON engine. Nothing is uploaded.
Why does my JSON show a validation error?+
JSON is strict: keys must be in double quotes, no trailing commas, and strings use double quotes only (not single). The error message includes the character position so you can jump straight to the problem.
What does minify do?+
Minify removes all whitespace and line breaks, producing the smallest valid JSON string. Useful for reducing payload size before sending over the network.
Does this handle large JSON files?+
Yes. The browser’s native JSON parser is fast and handles files of many megabytes. Performance depends on your machine.