About the Base64 to JSON
Decode a Base64 or Base64URL string and view the JSON inside it, formatted and validated.
Key features
- Decodes standard Base64 and URL-safe Base64URL
- Restores missing = padding automatically
- Ignores whitespace and line breaks in the input
- Strips data: URI prefixes
- UTF-8 decoding for emoji and non-Latin text
- Validates and pretty-prints the decoded JSON
Decode Base64 back to JSON
Base64-encoded JSON shows up everywhere: Kubernetes secrets, JWT tokens, webhook signatures, cookies, URL parameters, message queues and environment variables. This tool decodes it and shows the JSON inside, formatted and validated, so you can read it immediately.
Example
eyJ1c2VyIjoiYWRhIiwicm9sZSI6ImFkbWluIn0=
decodes to:
{
"user": "ada",
"role": "admin"
}
Inputs it understands
| Input | Handled |
|---|---|
Standard Base64 (+, /, =) | ✅ |
Base64URL (-, _, no padding) | ✅ |
Missing = padding | ✅ added automatically |
| Line-wrapped Base64 (76 chars per line) | ✅ whitespace ignored |
data:application/json;base64,... | ✅ prefix stripped |
Where to find Base64 JSON
- Kubernetes:
kubectl get secret my-secret -o jsonpath='{.data.config}' - JWT tokens: the middle segment of
xxxxx.yyyyy.zzzzz - AWS: CloudWatch Logs subscription data and some Lambda event payloads
- GitHub API: file contents returned by the contents endpoint
- Browser storage and cookies set by single-page apps
Decoding in code
// Browser / Node.js, UTF-8 safe
const json = JSON.parse(new TextDecoder().decode(Uint8Array.from(atob(b64), c => c.charCodeAt(0))));
echo 'eyJ1c2VyIjoiYWRhIn0=' | base64 --decode
Related tools
Encode JSON with JSON to Base64. Inspect tokens properly with the JWT Decoder. Decoded an image instead? Use Base64 to Image.
How to use the Base64 to JSON
- Paste your data into the input box, upload a file, or click Sample to try it out.
- Adjust the options above the editor if you need to (indentation, delimiter, and so on).
- The JSON appears instantly in the output panel. Any errors are shown with their line and column.
- Click Copy to copy the result, or Download to save it as a file.