Prettify JSON

JSON formatting (also called pretty-printing) adds consistent indentation and line breaks to compact JSON, making it human-readable. A formatter rewrites the same data with 2 or 4 spaces of indentation per level and one value per line without changing any data.

In Python: json.dumps(data, indent=2). In JavaScript: JSON.stringify(data, null, 2). With the jq CLI: cat file.json | jq .. In VS Code, Shift+Alt+F formats the open JSON file. This online tool does the same without any local setup or installation required.

All three terms mean the same thing — adding whitespace, indentation, and line breaks to compact JSON to make it human-readable. "Formatter" is the standard technical term; "beautifier" is used on general-purpose tools; "pretty print" comes from the programming convention (Python's json.dumps indent parameter). They produce identical output.

Yes. To reformat JSON the tool must first parse it, so any syntax error — trailing comma, mismatched bracket, single-quoted string — is caught immediately. The error is reported with the exact line and column number. If the JSON is invalid, no formatted output can be produced.

This formatter runs entirely in your browser — nothing is sent to any server. For extra caution with production credentials or PII, redact sensitive values before pasting, or use a local formatter: jq in a terminal, Prettier in your project, or VS Code's built-in Shift+Alt+F.