What does a JSON formatter do?

A JSON formatter parses JSON and prints it with consistent indentation so the structure is easier to read, review and debug.

What does a JSON validator check?

A JSON validator checks whether the input is valid JSON syntax, including quotes, commas, brackets, braces, numbers, booleans and null values.

Does this JSON formatter upload my data?

No. Formatting and validation happen entirely in your browser using JavaScript. Your JSON is not uploaded or stored.

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JSON Formatter & Validator Online

Indent

JSON input

Output

Ready

Free Online JSON Formatter and Validator

Paste JSON to format it with readable indentation, minify it into a compact string, or validate the syntax without changing the input. Everything runs locally in your browser.

JSON Beautifier for Debugging

Pretty-printed JSON makes nested objects, arrays, strings, numbers, booleans and null values easier to scan. Use it when reading API responses, config files, logs or exported data.

JSON Validator

Invalid JSON is flagged with the parser error so you can find missing quotes, trailing commas, unclosed brackets and other syntax problems before pasting the data into your app.

Frequently asked questions

Can this tool fix invalid JSON automatically?

No. It validates strict JSON syntax and reports parser errors. It does not guess how broken JSON should be repaired.

What is the difference between format and minify?

Format adds line breaks and indentation for readability. Minify removes unnecessary whitespace for a compact output.

Is my JSON uploaded?

No. Parsing, formatting and validation happen in your browser.