Base64 to JSON Decoder
Decode Base64 encoded JSON data online. Convert Base64 strings containing JSON back to readable, formatted JSON objects.
Base64 Input
56 characters
About This Tool
Mode: decode
Base64 encoding converts binary data to ASCII text, making it safe for text-based systems like JSON, XML, and URLs.
Decoded Output
Enter Base64 string to see the decoded result here.
Frequently Asked Questions
Why would JSON be encoded in Base64?
JSON is often Base64 encoded for safe transmission in URLs, storage in cookies, or embedding in other data formats where special characters might cause issues.
Can I decode JWT payload with this tool?
Yes! JWT tokens contain Base64URL encoded JSON in their header and payload sections. Just paste the middle section (between the dots) to decode it.
What if the decoded output isn't valid JSON?
The Base64 string might contain plain text, not JSON. Check the original source to confirm the data type, or use our general Base64 decoder.
How do I format the decoded JSON?
The decoded JSON is displayed as-is. Copy the output and use a JSON formatter tool to pretty-print it with indentation.
Practical Examples
JWT Token Debugging
Decode the payload section of JWT tokens to inspect claims and user data.
API Payload Inspection
Decode Base64 encoded JSON payloads from API requests or responses.
Configuration Recovery
Decode Base64 encoded configuration data stored in environment variables.
Common Issues & Solutions
JWT tokens use Base64URL encoding - our decoder handles this automatically.
If decoding shows garbled text, the content may not be JSON.
Remove any whitespace or line breaks from the Base64 string before decoding.
For nested Base64 (JSON containing Base64 strings), decode the outer layer first.