JSON Formatter
Paste your JSON below to validate and pretty-print it with 2-space indentation.
CleanTextly's JSON Formatter validates and pretty-prints JSON right in your browser, with clear, specific error messages when something's wrong. Paste a minified API response, a config file, or hand-written JSON, and it's instantly checked for valid syntax and reformatted with consistent 2-space indentation — no upload, no signup, and nothing ever leaves your browser.
Features
Instant Formatting
JSON is validated and pretty-printed live as you type or paste — there's no button you have to click to see the result.
Clear Error Messages
Invalid JSON shows a specific, actionable error message instead of a generic failure, so you know exactly what to fix.
Consistent 2-Space Indentation
Output is always pretty-printed with 2-space indentation, the most common formatting convention for JSON.
Valid JSON Indicator
A simple checkmark confirms your JSON is syntactically valid as soon as it parses successfully.
100% Private
Everything runs locally in your browser. Your JSON is never uploaded, logged, or stored anywhere.
How to Use
- 1
Paste your JSON
Add the JSON you want to format into the input box.
- 2
Check the validation status
A "Valid JSON" checkmark appears instantly, or a clear error message if the syntax is invalid.
- 3
Review the formatted output
Valid JSON is pretty-printed with 2-space indentation automatically as you type.
- 4
Copy or clear
Copy the formatted result with one click, or clear both fields to start over.
Example
Formatting a Minified API Response
Input
{"id":101,"name":"Jordan Lee","active":true,"roles":["admin","editor"]}Output
{
"id": 101,
"name": "Jordan Lee",
"active": true,
"roles": [
"admin",
"editor"
]
}Common Use Cases
Debugging API Responses
Paste a minified or raw API response to instantly see its structure and spot formatting mistakes.
Reviewing Config Files
Format compact config files like package.json or tsconfig.json for easier reading and review.
Validating Hand-Written JSON
Catch missing commas, unclosed brackets, or malformed quotes before using JSON in your code.
Cleaning Up Logs & Exports
Turn single-line JSON log entries or database exports into a readable, structured format.
Frequently Asked Questions
It appears as soon as your input parses successfully as JSON, confirming the syntax is valid before you copy it or use it elsewhere.
The tool shows the browser's own JSON parsing error, which typically points to where parsing failed and describes what went wrong, such as a missing comma or an unexpected token.
Not currently — output is always formatted with 2-space indentation, the most common convention for JSON.
No. Keys are kept in the exact order they appear in your input; only whitespace and line breaks are added.
Yes. Any valid JSON structure — nested objects, arrays, numbers, strings, booleans, and null — is parsed and formatted correctly, no matter how deeply nested.
No. Formatting and validation happen entirely in your browser. Your JSON is never sent to a server or stored.