How to Format and Validate JSON
Learn to read, format, and troubleshoot JSON, including quotation marks, commas, and nesting errors.
Step-by-step instructions
1. Understand valid JSON
JSON uses double-quoted object keys and strings, arrays in square brackets, and objects in curly braces.
2. Paste and format
Open the formatter, insert the JSON text, and use its formatting controls to indent nested objects and arrays.
3. Fix errors and verify
Check trailing commas, unescaped quotes, and mismatched brackets. Validate again after editing and test the output in the consuming application.
Try JSON Formatter
Ready to apply these steps? Open the corresponding Marketly tool.
Open JSON Formatter →Frequently asked questions
Can JSON contain comments?
Standard JSON does not support comments.
What is the difference between formatting and validating?
Formatting changes whitespace for readability; validation checks whether the text follows JSON syntax.