JSON Formatter & Validator
Format, minify and validate JSON quickly with clear error messages. Handy for checking API responses without blind pasting into an editor.
Shortcuts: Ctrl/⌘ + Enter to format, Ctrl/⌘ + Shift + C to copy.
About the JSON Formatter & Validator
Format, minify and validate JSON quickly with clear error messages. Handy for checking API responses without blind pasting into an editor.
Your JSON is analyzed only in your browser.
How to use the JSON Formatter & Validator
- Step 1Paste or type JSON in the input box.
- Step 2Press <strong>Format</strong> to pretty-print, <strong>Minify</strong> to compact it, or <strong>Validate</strong> to check it.
- Step 3Copy the result, or use the keyboard shortcuts.
When people reach for this tool
Turn a single unreadable line into a readable shape
A minified response tells you nothing at a glance. Indenting it shows the nesting you were looking for.
Find the exact spot where a payload is malformed
A validator reports the line and character rather than leaving you to hunt through a wall of text.
Check a hand-edited settings file still parses
Trailing commas and unquoted keys are easy to introduce by hand and easy to miss by eye.
Practical tips
- Format before you read, then validate. Validation alone will not tell you where the structure went wrong.
- If the formatter refuses the input, the JSON is invalid rather than merely ugly — the error position is the useful part.
What you get
- Format, minify and validate in one place
- Readable error messages with position info
- Never crashes on malformed JSON
- Keyboard shortcuts for common actions
- Handles reasonably large documents
JSON Formatter & Validator — FAQ
What does the validation error mean?
How do I format with Ctrl + Enter?
Why does my JSON fail to format?
Does formatting change my data?
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