Make JSON easier to read and inspect
Paste, type, or upload JSON, then pretty-print it with consistent indentation, minify it for compact storage, or validate its syntax with useful error details.
Text tool
JSON Formatter & Validator
Format, minify, validate, copy, and download JSON without sending it away from your device.
Format and validate JSON
Input
0 charactersJSON source
Upload a .json fileJSON only · Maximum 20.0 MB
Output
WaitingProcessed JSON
Process JSON in three steps
- Add JSON in the input editor or select a .json file.
- Choose Format, Minify, or Validate.
- Copy the valid output or download it as a JSON file.
Format, minify, or validate
Add two-space indentation and line breaks for clear reading and review.
Remove unnecessary whitespace while preserving the JSON data.
Check syntax, preserve source tokens, and receive a readable error location.
Processed entirely in your browser
A dedicated browser worker parses JSON locally so the page remains responsive. ToolNest does not upload the text or selected files to an API.
Standard JSON with Unicode text
Use objects, arrays, strings, numbers, booleans, and null values. Number notation, member order, duplicate entries, and Unicode strings are preserved and checked before output is released. Duplicate keys remain ambiguous to other software; warnings do not claim identical behavior in every parser.
Helpful answers
JSON Formatter FAQs
Is my JSON uploaded to a server?
No. ToolNest reads and processes pasted text and selected JSON files inside your browser. The content is not sent to a ToolNest processing endpoint.
What is the difference between format and minify?
Format adds indentation and line breaks for readability. Minify removes unnecessary whitespace to create a compact JSON string.
Does the validator show where an error occurred?
ToolNest displays the nearby line and column for syntax errors to help locate the problem.
Does it support Unicode and Urdu?
Yes. Valid JSON strings can contain Unicode text, including Urdu. Formatting and minifying preserve those characters.
How large can an uploaded JSON file be?
Files are limited to 20 MiB and decoded input to 20 million characters. Nesting is limited to 2,048 levels and output to 40 million characters. Processing speed and available memory depend on your device and browser.