JSON Formatter

Validate, format and minify JSON in your browser.

● Runs locally in your browser. No file or text uploads.

Inspect a response

The input {"name":"Ada","items":[1,2]} is valid JSON. Formatting adds indentation; minifying removes optional whitespace while preserving the parsed structure.

Find a common syntax error

{"name":"Ada",} is invalid because of the trailing comma. Remove the comma to obtain {"name":"Ada"}, then format it. Successful formatting checks JSON syntax; it does not prove that a service accepts those fields or values.

When to use it

Use this for API payloads and configuration snippets. It validates JSON syntax, not whether a payload meets an application schema.

About this tool

Validate, format and minify JSON in your browser. Use it without creating an account. Results are available immediately, and inputs are not saved between visits.

Does this send my input to a server?

Inputs are processed locally. Optional Analytics sends page statistics only after consent; tool inputs and files are excluded.