Paste or upload
Enter the content manually or drag a file with the .json extension.
Local processing
JSON Formatter and Validator
Paste code or upload a JSON file to check its syntax, detect errors, organize it into a readable structure or minify it for production.
Your content is processed locally in your browser and is not sent to SG Hub servers.
Editor and validator
Your content is never sent to or stored on a server.
Indentation
Input JSON
Paste your code or upload a JSON file.
You can also drag a .json file onto the editor.
153
Characters
10
Lines
153.0 B
Size
Result
The formatted or minified result will appear here.
153
Characters
10
Lines
153.0 B
Size
Valid JSON
The content is valid JSON.
Local processing
Your content is never sent to or stored on a server.
How it works
Review and organize JSON without installing software
JSON is a data exchange format used by APIs, web applications, configuration files, databases and software projects. A misplaced character can prevent an application from interpreting the content correctly.
Validate
Check the syntax and review the message generated when an error is found.
Format or minify
Choose a readable structure or a compact version for production.
Copy or download
Copy the result or save it as a new JSON file.
What the JSON validator checks
The validator uses the JSON parser included in the browser to determine whether the content follows standard JSON syntax.
- Curly braces and square brackets are properly closed.
- Property names use double quotes.
- Items are separated correctly with commas.
- Values use valid string, number, boolean, null, object or array types.
- No unexpected characters are present.
Formatting and minifying
Formatting and minifying use the same valid content, but generate results intended for different purposes.
Formatted JSON
Adds line breaks and indentation to make the content easier to read, review and debug.
Minified JSON
Removes unnecessary spaces and line breaks to create a more compact representation.
Private browser processing
The content you enter is interpreted and transformed on your device using JavaScript. The tool does not need to send your JSON to an external API.
Even with local processing, avoid pasting passwords, private keys, tokens or sensitive credentials on shared or untrusted devices.
Read the Privacy Policy →Important JSON syntax rules
- Property names must use double quotes.
- Comments are not supported.
- A comma cannot appear after the final item.
- The values undefined, NaN and Infinity are not valid JSON.
- Strings must correctly escape special characters.
Use cases
When to use a JSON formatter
Review responses received from an API.
Fix configuration files.
Prepare data for technical documentation.
Compare structures during an integration.
Create compact examples for production.
Locate errors before running an application.
Frequently asked questions
Questions about the JSON formatter
Is the JSON formatter secure?
Yes. All processing takes place locally inside your browser. SG Hub does not receive or store the content you paste or upload into this tool.
How can I find an error in JSON?
The tool analyzes the syntax and displays the message generated by the browser. When that information is available, it also shows the approximate line and column where the error was detected.
What is the difference between formatting and minifying JSON?
Formatting adds line breaks and indentation to make the content easier to read. Minifying removes unnecessary spaces and line breaks to generate a more compact version.
Can I upload a JSON file?
Yes. You can select or drag a file with the .json extension. You can then validate, format, minify, copy or download the result.
Does the tool modify my data?
It does not change valid property names or values. It uses JSON.parse and JSON.stringify to interpret the content and generate a new representation.
Can I choose the indentation size?
Yes. You can format the result using two or four spaces of indentation.
Does the formatter support comments inside JSON?
No. Standard JSON does not support comments, trailing commas or property names without double quotes. Those elements produce syntax errors.