JSON Formatting: Syntax, Validation, and Common Errors
Learn JSON syntax rules, common parsing mistakes, and how to inspect nested objects.
JSON is a strict data format used by APIs, configuration files, and many applications. Formatting makes it readable; validation checks whether the text follows JSON syntax.
Rules to remember
Property names and string values use double quotes.
JSON does not support comments, undefined, or trailing commas.
Use true, false, and null in lowercase.
Common errors
A missing comma between properties, a trailing comma, or mismatched braces can make a document invalid.
Do not confuse a JSON object with a JavaScript object literal, which allows additional syntax.
A safe workflow
Keep a source copy, format the JSON, fix syntax errors, and inspect the resulting structure. Minify only when compact output is useful.
Try the related tools
If you are working with important data, preserve the original, test on a sample, and validate the final result before using it in a production workflow.
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QueryCherry offers focused utilities for common data tasks. Basic tools are available without an account.
Review outputs before using them in production. Tool behavior and practical file limits can depend on your browser, device, and input.