JSON Formatter

Where it fits

Use JSON Formatter for beautifying minified JSON, validating API responses, inspecting logs, and preparing examples for docs or tickets. It works well when you want formatted JSON with syntax feedback and copy-ready indentation and do not need a bigger workflow around it.

• Best fit: beautifying minified JSON, validating API responses, inspecting logs, and preparing examples for docs or tickets.
• You start with raw JSON text from an API, log, clipboard, or generated output.
• The useful choices are indentation size, whether to sort or preserve order, and whether the input should be treated as strict JSON.
• Check syntax errors, trailing commas, comments, unquoted keys, and unexpectedly large nested data.
• You end up with formatted JSON with syntax feedback and copy-ready indentation.

What the page is actually doing

• The input is parsed as JSON and stringified with indentation.
• Syntax errors are shown inline.
• The tool does not execute JSON content.

A clean way to use JSON Formatter

1. Start with raw JSON text from an API, log, clipboard, or generated output.
2. Choose indentation size, whether to sort or preserve order, and whether the input should be treated as strict JSON.
3. Run the tool once, then review syntax errors, trailing commas, comments, unquoted keys, and unexpectedly large nested data.
4. Copy, export, or download formatted JSON with syntax feedback and copy-ready indentation.
5. Compare the final output against one known-good sample before you move on.

Where mistakes happen

• Strict JSON does not allow comments, trailing commas, or single-quoted strings.
• Formatting changes whitespace but should not change data values when the input is valid JSON.
• Format before comparing or validating so structural problems are easier to see.
• Avoid pasting secrets from live API responses; use reduced examples when possible.

How your data is handled

This tool works in your browser. Toolumina does not upload or keep the content you enter here.

FAQ