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JSON Formatter & Validator

Format, validate, and minify JSON online. Paste your JSON to organize nested data, spot syntax errors, or create compact JSON for APIs and development.

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JSON Formatter & Validator

Format, minify and validate JSON with readable error feedback.

How to format and validate JSON

1. Paste your JSON. Copy JSON from a configuration file, API response, or code editor into the tool.

2. Format or minify. Use the formatting option to indent nested objects and arrays for readability, or minify to remove unnecessary whitespace.

3. Check the result. If the JSON is invalid, review the error message and correct the syntax before copying the output.

What to know about JSON formatting

Valid JSON follows strict syntax. Property names must use double quotes, strings must use double quotes, and trailing commas or comments are not allowed.

Formatting does not change the data. Pretty-printing adds whitespace and indentation; minification removes extra whitespace. Both preserve the JSON values when the input is valid.

Privacy: Avoid pasting passwords, API keys, personal information, or confidential data into any online tool unless you have verified its data-handling behavior.

Frequently asked questions

Quick answers about JSON syntax, formatting, and validation.

A JSON formatter adds indentation and line breaks to valid JSON so nested objects and arrays are easier to read. It does not change the underlying values.
Paste your JSON into the tool and use its validation or formatting action. If the JSON contains a syntax error, the tool reports an error so you can correct the structure.
Formatting adds whitespace to improve readability. Minifying removes unnecessary whitespace to produce more compact JSON, while preserving the same data.
Common problems include trailing commas, missing quotation marks around property names, mismatched brackets, or comments. Standard JSON requires double-quoted property names and strings.

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