JSON Formatter
Beautify, minify, and validate JSON in your browser with indent, key sorting, non-ASCII escape, and clear line/column error reporting — no upload required.
Read the full guideValid JSON
Tip: drag and drop a .json file, or paste from clipboard.
324
Input chars
383
Output chars
28
Output lines
4
Max depth
12
Object keys
2
Arrays
+18.21%
Size change
100% private — runs in your browser
Your JSON is parsed, formatted, and validated locally. Nothing is uploaded to any server.
JSON Formatter beautifies messy JSON, minifies it for transport, or validates the syntax — all inside the browser tab. The same input feeds all three modes.
Paste any JSON, drop a file, or click Sample to load a snippet. The input editor stays writable so you can patch the source after formatting.
Choose 2 spaces, 4 spaces, or tabs for indent. Toggle key sorting to canonicalize objects for diffs. Enable non-ASCII escaping to make output portable across encodings.
Copy to clipboard, save as .json, or use Copy Compare to grab pretty + minified versions in one block for diffing or documentation.
No. Parsing, beautifying, minifying, and validation all happen inside your browser tab. Nothing is uploaded.
The validator follows strict RFC 8259 JSON, so trailing commas and comments will be reported as errors. Strip those before formatting if your source uses JSONC.
The error pointer is derived from the parser's position offset and mapped back to a line and column. Multi-byte characters or unusual newline styles can shift the apparent column by one or two characters.
Files up to a few megabytes work smoothly. Very large documents may temporarily freeze the tab while the browser stringifies them — minify before formatting for the lightest output.