Base64 to JSON
Decode a Base64 string and pretty-print the JSON inside — JWT payloads, signed cookies, deeplinks, anything.
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Decode Base64 into JSON
When a system hands you an opaque-looking Base64 string and you suspect it's JSON inside — a JWT segment, a signed cookie, a deeplink parameter — this is the tool. Paste, get the pretty-printed JSON back, copy or download. The parse step doubles as validation, so malformed JSON gets caught up front.
To go the other direction, try JSON to Base64.