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Base64 to JSON Decoder

Decode Base64 strings and pretty-print JSON data — paste encoded text to see the decoded result instantly. Inspect API payloads and tokens readably — free, local, no signup.

100% Local Browser Native

How to Use the Base64 to JSON Decoder

1. Paste JSON

Paste JSON text into the input area. Nothing runs until you trigger it.

2. Decode

Decode back to readable form.

3. Copy decoded

Copy the decoded output.

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Frequently Asked Questions

What does it do with Base64 input?

Decodes the Base64 string to its original text, then attempts to parse it as JSON. If successful, the JSON is pretty-printed with syntax highlighting.

Does it auto-detect Base64?

Yes. Paste any Base64 string and the tool attempts to decode it. If the result is valid JSON, it's automatically pretty-printed.

Can I paste raw JSON?

Yes. You can paste either Base64-encoded JSON or raw JSON. Raw JSON is directly pretty-printed without Base64 decoding.

Does it pretty-print nested objects?

Yes. Deeply nested JSON objects and arrays are formatted with proper indentation (2 spaces) and syntax highlighting for easy reading.

When using Base64 to JSON Decoder, is my data uploaded?

No. All decoding and formatting happens locally in your browser. No data is transmitted to any server.

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Last updated October 2026