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JSON has no tolerance for a trailing comma, an unquoted key, or a stray single quote, and the error a browser console gives you for a broken payload ("Unexpected token") rarely points at the real problem. This formats, validates, and minifies JSON, with a collapsible tree view for digging into deeply nested API responses, plus conversion to XML, YAML and CSV.

When you'd use this

Debugging an API response that arrived as one unreadable line. Paste it in and get properly indented output you can scan, or switch to the tree view and collapse everything except the branch you care about.

Converting between formats: a YAML config that needs to become JSON for a script, or a JSON array that needs to land in a spreadsheet as CSV.

Common errors

The most frequent validation failure is a trailing comma after the last item in an object or array. It's valid in JavaScript object literals and invalid in strict JSON. Unquoted keys and single-quoted strings come next, both also legal JS and both rejected here.

If a value looks like a number but is being treated as a string after a round trip through YAML or CSV, or the other way around, check for a leading zero or a value like "NA". Different formats infer types differently, and this converter won't force a coercion it isn't confident about.

Frequently asked questions

Why does minified JSON look different from the original spacing?

Minifying strips all non-essential whitespace. The data doesn't change, only the formatting. Need the original indentation back? The same tool re-formats minified JSON just as easily.

Does the tree view handle very large JSON payloads?

It does, and it's generally the more usable view for large or deeply nested responses. Collapse the branches you don't need instead of scrolling past thousands of lines of formatted text.

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