Base64 to JSON Converter

The Base64 to JSON Converter is a developer-first utility that instantly decodes Base64 strings, validates the payload, and formats valid JSON so it is readable again. It is ideal for debugging webhook payloads, inspecting encoded API responses, or recovering JSON that was embedded inside configuration files or data URLs.

Why developers reach for this tool

• Accurate validation: Base64 input is checked for invalid characters and padding before it is decoded.
• UTF‑8 safe decoding: Multibyte characters are preserved so you can recover emoji, localized text, and binary-friendly JSON.
• Pretty output: The decoded JSON is automatically indented and color coded in the tool layout for quick scanning.
• File friendly: Upload a .txt, .json, or any text file that contains Base64 and the tool will read it locally in your browser.
• Manual or live mode: Toggle auto-convert for instant feedback, or run decoding on demand when working with large payloads.

How to use the Base64 to JSON Converter

1. Paste or upload the Base64-encoded string into the input panel. Whitespace and line breaks are ignored automatically.
2. Keep “Auto-convert as you type” enabled for instant decoding, or disable it if you prefer to review the Base64 first.
3. Review the formatted JSON in the right-hand panel. Use the copy/download buttons to reuse the decoded payload.
4. If decoding fails, the tool will display a toast message explaining whether the Base64 is malformed or the decoded data is not valid JSON.

Helpful tips

• You can stack multiple Base64 blocks by decoding one, clearing the input, and pasting the next string.
• Combine this converter with the site’s JSON beautifier or JSON diff tools when you need deeper analysis.
• Because everything runs in-browser, sensitive payloads never leave your machine.

Use cases

• Inspecting encoded payloads from AWS Lambda, Firebase Cloud Messaging, or other services that wrap JSON in Base64.
• Debugging webhook signatures that include Base64-encoded metadata.
• Decoding Base64 blobs stored in log files or exported audit trails.