CodeItBro

JSON to Base64 Converter

Convert JSON objects to Base64 encoded strings and decode Base64 back to JSON. Fast, free, and privacy-focused.

Base64 encoded string will appear here

Use Cases

  • • JWT Payloads: Decode the Base64-encoded payload section of JWT tokens
  • • URL Parameters: Safely embed JSON in URL query strings
  • • API Authentication: Encode credentials or tokens for HTTP headers
  • • Data Storage: Store JSON in environments with character restrictions

Encode & Decode JSON as Base64

Base64 encoding transforms JSON data into a safe ASCII string format, perfect for embedding in URLs, cookies, or anywhere that doesn't support special characters. Our tool validates JSON before encoding and pretty-prints decoded results.

Base64 Encoding

Why Use This Tool?

Real-Time Conversion

See results instantly as you type. No need to click buttons.

JSON Validation

Input is validated before encoding to catch JSON errors early.

Bidirectional

Switch between encode and decode with one click. Swap input/output seamlessly.

100% Private

All processing happens in your browser. Your data never leaves your device.

How this JSON to Base64 Converter works

This converter transforms JSON data into Base64 encoded strings using JavaScript's btoa function combined with encodeURIComponent for proper UTF-8 handling. The encoding process first validates the JSON syntax, then minifies it by removing unnecessary whitespace, and finally converts the result to Base64 format suitable for URL parameters, HTTP headers, or anywhere special characters are problematic.

The decoder reverses this process through atob and decodeURIComponent, handling UTF-8 encoded content correctly. When decoding, the tool attempts to parse the result as JSON and pretty-prints it with proper indentation for readability. If the decoded content isn't valid JSON, you'll receive the raw decoded text along with a warning message.

Real-time processing provides instant feedback as you type, validating JSON syntax before encoding to catch errors early. The bidirectional mode switching allows seamless conversion between encoding and decoding directions. All processing runs locally in your browser, making this tool suitable for handling sensitive data like JWT payloads, API credentials, or encrypted configuration values that shouldn't be transmitted to external servers.

How to Use

1

Choose Mode

Select encode to convert JSON to Base64, or decode to convert Base64 back to JSON.

2

Enter Data

Paste your JSON object or Base64 string into the input field.

3

Get Result

Copy the encoded Base64 or decoded JSON instantly.

Example Usage

Encoding a simple JSON object:

Input
{"key": "value"}
Output
eyJrZXkiOiAidmFsdWUifQ==

Frequently Asked Questions

Why encode JSON as Base64?
Base64 encoding is useful for safely transmitting JSON in URLs, HTTP headers, or embedding in environments that don't support special characters.
Is the JSON validated before encoding?
Yes! The tool validates your JSON syntax before encoding to ensure you're encoding valid JSON data.
Can I decode any Base64 string?
Yes, but if the decoded result isn't valid JSON, you'll see a warning. The decoded text will still be displayed.
Is my data safe?
Absolutely. All encoding/decoding happens in your browser. No data is sent to any server.

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The JSON to Base64 Converter is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.