JSON Formatter
Format, validate, and beautify your JSON data.
Runs in your browser — your data never leaves your device
Frequently Asked Questions
What does the JSON formatter do?
It takes minified, compressed, or poorly formatted JSON and pretty-prints it with proper indentation, making it easy to read and debug.
How do I format JSON?
Paste your JSON (minified or messy) into the input field, and the tool instantly formats it with configurable indentation (2 or 4 spaces, or tabs).
Does it validate JSON?
Yes. If the input contains invalid JSON (missing commas, unmatched brackets, trailing commas), the tool highlights the error location and describes the issue.
Can I collapse or expand nested objects?
Yes. The formatted output includes collapsible/expandable sections for each nested object and array, making it easy to navigate large JSON structures.
Is this formatter free?
Yes, ToolDock's JSON formatter is completely free, requires no signup, and runs entirely in your browser.