DEVELOPER TOOL
JSON Formatter & Validator
Format, validate, and beautify JSON instantly. Auto-formats as you type. No sign-up. No data leaves your browser.
Indent
Input JSON
Output
// Formatted output will appear hereCommon JSON errors
Missing quotes around keys
Wrong
{name: "John"}Correct
{"name": "John"}Trailing commas
Wrong
{"name": "John",}Correct
{"name": "John"}Single quotes instead of double
Wrong
{'name': 'John'}Correct
{"name": "John"}Unescaped backslashes
Wrong
{"path": "C:\Users"}Correct
{"path": "C:\\Users"}FAQ
Is my JSON data stored or sent to a server?
No. All processing happens in your browser. Your data never leaves your device.
What's the maximum JSON size this tool can handle?
Files up to several megabytes work well. For 50MB+, use a desktop application.
Why is my JSON showing as invalid?
Common causes: missing quotes around keys, trailing commas, single quotes, or unescaped characters. Check the error message.
What's the difference between JSON and JavaScript objects?
JSON is stricter: keys must be double-quoted, no trailing commas, no functions, only double quotes for strings.
Can I use this for API response debugging?
Yes — paste any API response to see the structure, missing fields, and data hierarchy.
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