Paste a Base64-encoded JSON string and instantly get beautifully formatted, syntax-highlighted JSON. Perfect for decoding API payloads, JWT claims, and configuration data.
APIs, webhooks, and configuration files often transmit JSON data as Base64-encoded strings. This tool decodes the Base64 encoding and formats the resulting JSON with proper indentation and syntax highlighting.
The formatter validates the JSON structure and catches common issues like trailing commas, missing quotes, or unescaped characters. Choose between 2-space, 4-space, or tab indentation.
The tool will show you the decoded text and indicate that it's not valid JSON. You can still see the raw decoded output. Try the Base64 to Text tool for non-JSON content.
This tool decodes one level of Base64 encoding. If your JSON contains Base64-encoded values, decode the outer layer first, then decode individual values separately.
Yes. After decoding, the tool parses the JSON and reports any syntax errors including the position of the error. Valid JSON is displayed with proper formatting.
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