JSON Formatter, Validator & Viewer Free Online | StringFlux
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ABOUT JSON FORMAT
This page provides a specialized tool for formatting JSON data. JSON (JavaScript Object Notation) is a lightweight data interchange format, as defined by json.org. When working with JSON, proper formatting is essential for readability and debugging.
The JSON Format tool helps you transform minified or unformatted JSON into a well-structured, readable format. It adds proper indentation, line breaks, and spacing to make your JSON data more readable and easier to work with. This is particularly useful when dealing with API responses, configuration files, or any JSON data that needs to be human-readable.
The tool includes built-in JSON validation that automatically checks your input for syntax errors and structural issues. If any errors are detected, you will receive clear error messages indicating the exact location and nature of the problem. Additionally, when possible, the tool offers a Fix JSON feature that can correct common JSON formatting issues, such as missing quotes, trailing commas, or incorrect value types.
As part of StringFlux, this tool can be chained with other JSON operations for more complex transformations. For instance, you can format a JSON string and then minify it for production use. If you need to minify your JSON instead, check out our JSON Minify Tool.
FAQ
Can I validate (lint), format, and beautify JSON in one operation?
Yes. Our tool integrates validation, formatting, and beautification into a single operation. When you click the Format JSON button, it first validates the input and then formats it with proper indentation, making your JSON clean and readable.
Can I use this JSON format tool as a JSON viewer?
Yes, absolutely! This tool doubles as a lightweight JSON viewer. When you click Format JSON, it not only validates and beautifies your JSON, but also displays it with syntax highlighting, and supports folding/unfolding of nested structures for easier navigation.
Can I chain the output of the JSON Format tool into another?
Absolutely. Once formatted, our tool detects the content type and recommends relevant operations—such as Minify JSON, JSON to CSV, JSON to XML, JSON to YAML, or even Base64 encoding—so you can chain tasks seamlessly without switching pages.
What indentation styles are supported (e.g., spaces, tabs)?
Currently, we use 2 spaces for indentation, which is the most widely adopted convention. We plan to add customizable indentation settings in the near future, allowing users to choose between spaces, tabs, and custom sizes.
Do you automatically fix common JSON errors—like trailing commas or wrong quotes?
In many cases, yes. If your JSON input is invalid, our tool will check whether a fix is possible. If yes, Fix JSON button will appear in the error message. In the future, users will be able to control whether auto-fix is enabled.
Is any JSON I submit stored?
No. All operations are performed locally in your browser—nothing is sent to a server unless you use the Share feature. When sharing is used, the data is securely stored on our backend for generating a unique, shareable link.
Can I see examples of JSON Format?
Sure. Here are two examples:
Valid JSON:
Formatted Output:
Try shared example 1 of JSON Format.
Broken JSON:
This input contains syntax errors (missing quotes, trailing comma). The tool will detect issues and offer a Fix JSON option to repair and format it.
Formatted Output:
FEATURES
Transformation Chains
Chain multiple operations to perform complex transformations, similar to a command line pipe.
Privacy First
All string transformations happen purely on the browser side, ensuring your data never leaves your device.
Intuitive UX
Simple and intuitive UX to provide operation in 3 ways: recommended by content type, search and category.
Share & Collaborate
Share your string transformation chain with others using share links.