Developer & Data tool

JSON Formatter & Validator

Expand compact JSON with indentation or see why an input cannot be parsed as JSON.

The tool parses and rewrites JSON; it is not a lossless editor for the original number text or key order.

JSON input1 lines

Validated result

Use standard JSON
Property names and strings need double quotes. JavaScript objects with comments or trailing commas are not valid JSON.
Choose two or four spaces
Select the indentation and run Format. Valid input is displayed with its nested structure expanded.
Review the rewritten values
Check that the properties and values you need remain intact. Long numeric identifiers are safer as strings.

A worked example

Start with: {"name":"Alex","count":2} · two-space indentation
Check the result: The name and count properties appear on separate lines indented by two spaces.

The input is parsed and serialized. Four-space indentation changes spacing without changing these values.

Tools that work well together