Many APIs return Base64-encoded JSON payloads for security or transport reasons. This tool decodes the Base64 string and formats the resulting JSON for easy reading and debugging.
Cloud services (AWS, Azure, GCP), webhook payloads, and event-driven systems often encode JSON data in Base64. Decoding and formatting makes debugging much faster.
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How to Base64 to JSON — Decode Encoded API Responses
- Paste the Base64-encoded string from your API response
- Click Decode to convert back to text
- The tool automatically detects and formats JSON output
- Copy the formatted JSON for debugging or use
- Identify the fields you need from the decoded payload
Pro Tips
- AWS Lambda event payloads are often Base64-encoded — decode here for quick debugging
- JWT tokens have 3 Base64URL-encoded parts — decode the middle one for the payload
- If output is not valid JSON, the encoded data may be compressed (gzip) before encoding
- Use JSON formatter tools alongside for better readability of complex payloads
Frequently Asked Questions
Why do APIs encode JSON in Base64?
To safely transmit data through systems that may corrupt special characters, handle binary attachments, or nest JSON inside other JSON without escaping issues.
How to decode a JWT token payload?
Split the JWT by dots (header.payload.signature). The middle part is Base64URL-encoded JSON. Decode it to see claims like user ID, expiry, and roles.
Can I decode compressed Base64 JSON?
If the JSON was gzip-compressed before Base64 encoding, you need to decompress after decoding. This tool handles standard Base64-to-text conversion.
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