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
Basic Knowledge
What is JSON?
JSON is a lightweight data format that represents data as a combination of "name-value pairs" and arrays. It is used as the de facto standard for data exchange between systems, such as in API responses and configuration files.
Common Syntax Errors
- Trailing Comma：A trailing comma is an extra comma after the last element. While permitted in JavaScript, it causes a syntax error in JSON.
- Single Quotes：JSON strings and key names must be enclosed in double quotes ("). Using single quotes (') will result in an error.
- Comments：JSON does not have a comment syntax, so writing // or /* */ will make the JSON invalid.
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.
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Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
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Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
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If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.