Base64 Input

0 characters

JSON Output

All decoding happens locally in your browser. Your data never leaves your device, ensuring complete privacy and security.

Formatted Output

The decoded JSON is automatically formatted with proper indentation and syntax highlighting for easy readability.

Advanced Features

Get detailed statistics about your JSON structure, including key count, depth analysis, and size estimation.

How to Use Base64 to JSON Decoder

1Prepare Your Base64 Data

You need a Base64 encoded string that represents JSON data. This is commonly found in JWT tokens, API responses, or data storage formats.

Example Base64 String: eyJ0aXRsZSI6IkJhc2U2NCBGb3JtYXQiLCJkZXNjcmlwdGlvbiI6IkNvbnZlcnQgQmFzZTY0IHRvIEpTT04iLCJ2ZXJzaW9uIjoxLjB9

2Decode to JSON

Paste your Base64 string into the input field and click the "Decode to JSON" button. The tool will automatically decode and format the JSON.

{
  "title": "Base64 Format",
  "description": "Convert Base64 to JSON",
  "version": 1.0
}

3Use the Decoded JSON

Once decoded, you can copy the JSON to your clipboard, download it as a file, or analyze its structure using the provided statistics.

4Common Use Cases

  • Decoding JWT (JSON Web Tokens)
  • Debugging API responses
  • Working with encoded data in storage
  • Analyzing serialized JSON structures
  • Developing and testing applications

Popular Libraries for Base64 and JSON Handling

JavaScript

js-base64 Library

The js-base64 library provides robust Base64 encoding/decoding for JavaScript:

// Encode to Base64 const encoded = Base64.encode('Hello World');  // Decode from Base64 const decoded = Base64.decode(encoded);  // Parse JSON const json = JSON.parse(decoded);
Visit js-base64 on npm

Python

Python's standard library includes modules for Base64 and JSON:

import base64 import json  # Encode to Base64 encoded = base64.b64encode(b'Hello World')  # Decode from Base64 decoded = base64.b64decode(encoded)  # Parse JSON data = json.loads(decoded)

Java

java.util.Base64

Java 8+ includes Base64 encoding/decoding in the standard library:

import java.util.Base64; import com.google.gson.Gson;  // Encode to Base64 String encoded = Base64.getEncoder() .encodeToString("Hello World".getBytes());  // Decode from Base64 String decoded = new String( Base64.getDecoder().decode(encoded));  // Parse JSON with Gson Gson gson = new Gson(); MyObject obj = gson.fromJson(decoded, MyObject.class);

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