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Base64 to JSON Decoder
Decode Base64 into validated JSON locally
Decode standard or URL-safe Base64 as UTF-8, validate the resulting JSON and format it privately in your browser.
Need the reverse conversion? JSON to Base64.
Output
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Conversion runs entirely in this browser.
Deterministic conversion
How this encoding works
Standard and URL-safe alphabets are accepted, missing padding is restored safely, and decoded bytes must be valid UTF-8 JSON.
Honest limitations
Encoding does not add secrecy or missing types
Arbitrary binary Base64 is rejected because this tool specifically expects UTF-8 text containing one valid JSON value.