JSON Formatter
Format, validate, and minify JSON with instant error pinpointing.
Paste raw JSON and get a clean, indented version instantly — or minify it down to a single line for production. If the JSON is invalid, the validator points at the exact line and character of the first error with a plain-English explanation, which beats staring at a wall of brackets.
Because parsing happens in your browser with the native JSON engine, it is fast on megabyte-sized payloads and safe for sensitive data: API responses, config files, and tokens are never uploaded anywhere.
How to format JSON
- 1
Paste your JSON into the input panel (or drop a .json file).
- 2
Click Format to beautify, or Minify to compress — errors are highlighted with line numbers if the JSON is invalid.
- 3
Copy the result or download it as a .json file.
Why use Nofolo’s json formatter?
Format & beautify
Pretty-print with 2-space, 4-space, or tab indentation — sorted keys optional.
Precise error location
Invalid JSON shows the line, column, and a readable description of what went wrong.
Minify
Strip all whitespace for the smallest payload with one click.
Stats at a glance
Key count, depth, and size before/after so you know what you are shipping.
Private
Your JSON never leaves the page — safe for API keys, PII, and internal payloads.
Handles big payloads
Native browser parsing formats multi-megabyte JSON in milliseconds.
Frequently asked questions
Is my JSON sent to a server?
No. Parsing, formatting, and validation use your browser’s built-in JSON engine. Nothing is transmitted, logged, or stored — safe for production payloads and secrets.
How do I find the error in invalid JSON?
Click Format. Instead of failing silently, the validator reports the line and column of the first syntax error — a missing comma, an unquoted key, a trailing comma — with the surrounding text shown.
What is the difference between formatting and minifying?
Formatting adds indentation and line breaks so humans can read the structure. Minifying removes every unnecessary character so machines transfer fewer bytes. The data itself is identical.
Can it handle large JSON files?
Yes. Because it uses native JSON.parse, files of several megabytes format in well under a second on a typical laptop.
Does it change my data?
Never. Only whitespace (and optionally key order for display) changes — values, types, and structure are preserved exactly.
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