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JSON Formatter & Validator
Pretty-print or validate JSON, free
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About this tool
Format messy JSON into readable, indented text, or just check whether a JSON string is valid.
Frequently asked questions
What does "sort keys" do?
It alphabetically reorders every object's keys in the output — useful for diffing two JSON payloads or just getting a more predictable, scannable structure.
My JSON says invalid but looks fine to me — why?
Common culprits: trailing commas, single quotes instead of double quotes, unquoted keys, or a missing closing bracket — strict JSON is stricter than JavaScript object literals.