JSON Formatter
Format and validate JSON for readability
Features
Switch between 4 indents
Choose from 2 or 4 spaces, tabs, and minify
Pinpoint syntax errors
Instantly point out the line and column of invalid JSON
Supports copy and download
Get and save the formatted result with one click
Instant check with samples
Quickly check behavior with valid and invalid examples
How to Use
Enter the JSON data
Paste a JSON string in the input field, or load it from a sample
Select the indent format
Choose one of 2 spaces, 4 spaces, tabs, or minify via radio buttons
Press the format button to run
Press the format button to parse and validate, with the result shown on the right
Copy and save the formatted result
Save the formatted JSON with the copy button or download button
Use Cases
Check API responses
Format API output returned on a single line to visually grasp the structure
Tidy up configuration files
Tidy package.json, tsconfig, and the like with uniform indentation
Debug JSON syntax
Quickly identify the cause of broken JSON with line and column error indications
Minify JSON to reduce size
Save data traffic and storage with the minimal size, free of extra whitespace
Read data for learning
Expand nested structures for readability to understand the data hierarchy
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
formatting and validating JSON is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
the JSON you entered and the formatted result and input suggestions are not stored on the server.