Base64 to JSON Converter
Decode Base64-encoded strings and parse them as JSON with automatic formatting. Perfect for inspecting API responses, JWT payloads, and encoded configuration data. All processing happens in your browser for complete privacy.
Recommended Settings
For API Work
- •Perfect for debugging Base64-encoded API responses
- •Decode JWT token payloads to inspect claims
- •Analyze encoded webhook data
For Security
- •All decoding happens in your browser
- •No data sent to external servers
- •Safe for sensitive information
Pro Tips
- •For JWT tokens, decode only the middle part (payload)
- •Automatically formatted for easy reading
- •Use Base64 to ASCII if decoded data isn't JSON
Most Popular
Most users decode API responses and JWT payloads
When to Use This Tool
Decode Base64-encoded JSON data from API responses or webhook payloads. Many APIs encode JSON data in Base64 for safe transmission, and this tool helps you quickly inspect the actual content.
Recommended: Development
Inspect JSON configuration files or settings that were Base64-encoded for storage or transmission. Common in JWT tokens, browser storage, and configuration management systems.
Recommended: Security
Decode JSON data stored as Base64 in database fields. Useful when databases store structured data in encoded format for compatibility or security reasons.
Recommended: Database
How It Works
Paste your Base64-encoded string
Tool decodes using built-in browser functions
Parses decoded data as JSON
Formats output with proper indentation
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Client-side JavaScript for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
What does this tool do?
This tool decodes Base64-encoded strings and parses them as JSON, automatically formatting the output for easy reading. It's perfect for inspecting encoded JSON data from APIs, tokens, or storage systems.
What if the decoded data isn't JSON?
The tool will show an error if the decoded Base64 string doesn't contain valid JSON format. In that case, you may want to use the Base64 to ASCII tool instead to see the raw decoded text.
Can I decode JWT tokens with this?
Yes! JWT tokens have three Base64-encoded parts separated by dots. You can decode the payload (middle section) to see the JSON claims. Just paste the middle part between the dots.
Is my data safe?
Absolutely! All decoding happens entirely in your browser using client-side JavaScript. No data is ever sent to any server, ensuring complete privacy and security.
Why is the JSON formatted differently?
The tool automatically pretty-prints the JSON with proper indentation for readability. This makes it much easier to understand the structure compared to minified JSON, while maintaining the exact same data.