JSON Formatter
Beautify, minify, and validate JSON in the browser.
100% client-side — your data never leaves your browser.
Click Format or Minify to see your result.About the JSON Formatter
Format, minify, and validate JSON in your browser. Paste messy or compact JSON and instantly get a clean, indented version — or strip it back down to a single line. Invalid JSON produces a clear error message so you can find the problem fast.
How to use the JSON Formatter
- 1Paste your raw or messy JSON into the input area.
- 2Click "Format" for indented, human-readable JSON.
- 3Click "Minify" to strip whitespace and shrink it to one line.
- 4Use "Copy" to send the cleaned result to your clipboard.
Why use our JSON Formatter
Beautify with indentation
Pretty-print with 2-space indentation for readability and code reviews.
One-click minify
Strip every whitespace character to make payloads as small as possible.
Real validation
Catches syntax errors and tells you what went wrong in plain English.
Private by design
Parsing happens locally with JSON.parse — your data never touches a server.
Frequently asked questions
What counts as valid JSON?+
Valid JSON follows RFC 8259: double-quoted keys and strings, no trailing commas, no comments, and only the literals true, false, and null. Single quotes and JavaScript-style comments aren't allowed.
Why am I getting an error on valid-looking JSON?+
Common culprits are trailing commas, single quotes around keys or strings, or unescaped characters inside strings. The error message shows the position where parsing failed.
Does minifying change the meaning of my JSON?+
No. Minifying only removes whitespace between tokens — the parsed value is identical to the formatted version.
Is my JSON uploaded?+
No. All formatting, minifying, and validation happens in your browser. Your data is never transmitted or stored.