How to Format and Validate JSON Online
Format, inspect, and validate JSON data in your browser with Kivrum’s free JSON Formatter.
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Quick answer
Paste JSON into Kivrum JSON Formatter and run the formatter. Valid data is displayed with consistent indentation for easier reading; invalid data reports a syntax problem you can correct before copying the result.
What does a JSON formatter do?
A JSON formatter turns compact or inconsistently spaced data into an indented structure that is easier to read. Validation also checks whether the text follows JSON syntax.
This is useful when reviewing API responses, configuration files, webhooks, and structured data.
How to format JSON online
Follow these quick steps.
- 1
Paste your JSON
Insert the object or array you want to inspect.
- 2
Format the data
Run the formatter to apply consistent indentation and line breaks.
- 3
Fix syntax errors
If validation fails, check the reported area for missing quotes, commas, braces, or brackets.
- 4
Copy the result
Copy the readable output into your editor or application.
Common JSON errors
Frequent problems include single quotes, an extra comma after the last property, missing closing braces, and unescaped quotation marks inside strings.
Formatting makes nesting visible, but it does not confirm that field names or values match an external API’s business rules.
Format JSON privately in your browser
Kivrum processes the text in your browser. Even so, remove passwords, API keys, access tokens, and personal information before sharing formatted output.
Try it on Kivrum
Open the real tool and follow the steps in this guide.
Frequently asked questions
Is formatted JSON different from the original data?
Formatting changes whitespace and indentation, not the parsed values or structure.
Why is my JSON invalid?
Check for single quotes, trailing commas, missing separators, unescaped characters, or unmatched braces and brackets.
Can JSON contain comments?
Standard JSON does not support comments. Remove them before validating the document.