JSON Encode/Decode
Encode data into a JSON string, and decode a JSON string back into data
Features
Supports both encoding and decoding
A bidirectional tool that converts between data and JSON strings
Parses JS-like notation too
Converts unquoted keys, trailing commas, and content with comments
Choose from 4 indents
Switch between 2/4 spaces, tabs, and minify to suit your purpose
Fine-grained escape control
Specify escaping of Unicode characters and slashes individually
How to Use
Select the conversion mode
Choose the encode or decode tab to set the conversion direction
Enter the data
Paste an object, array, or JSON string into the input field
Adjust the output format
Set the indent type and Unicode and slash escaping
Check and retrieve the result
Check the conversion result on screen and use it via copy or file save
Use Cases
Check formatted API responses
Format minified JSON for readability to quickly grasp the structure
Create configuration files
Convert hand-written objects into valid JSON format and save them
Transcribe from JS code
Convert JS objects with unquoted keys into proper JSON
Learn JSON syntax
Compare the encoded results to understand how data is represented
Verify multibyte characters
Check the internal representation of text such as Japanese with Unicode escapes
Basic Knowledge
What is JSON Escaping?
JSON escaping is the process of replacing characters that cannot be written directly in a string—such as '"' or newlines—with backslash-prefixed notation like '\"' or '\n'. Missing escapes are a common cause of syntax errors.
Why Does Japanese Text Become \uXXXX?
In JSON, any character can be represented using Unicode notation like '\u3042'. Due to compatibility with legacy systems that cannot handle non-ASCII characters, Japanese text is often converted to this format by convention. Both notations have the same meaning.
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
the conversion process 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 input data and conversion result and input suggestions are not stored on the server.
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RAKKOTOOLS is free to use!
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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Use in schools, work, and events
Can be used in various situations such as classes, team division, internal work, and events.
Introduction on Web, books, and SNS
Feel free to introduce it as a useful tool on web media, books, SNS, and other platforms.
Commercial use
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.