Free JSON to Base64 — standard · URL-safe · code snippets

Convert JSON to Base64
Standard, URL-safe
and code snippets.

Encode any JSON to Base64 online — standard or URL-safe. Minify before encoding. Get JavaScript, Python, Node.js and Java code snippets. Runs entirely in your browser.

Your data never leaves your browser
Standard + URL-safe encoding
JS · Python · Node · Java snippets
Always free
JSON to Base64 Encoder   100% client-side
JSON input
  Base64 ready 

      

 
    

  

 
  
  
Why encode JSON as Base64?

  
Common use cases where Base64-encoded JSON is the right approach.

  

    

      
 URL query parameters

      
JSON contains characters that are unsafe in URLs — {"key":"value"} becomes a broken URL. Encoding to Base64 (URL-safe) produces a single clean string safe for query parameters, path segments and anchor hashes — no additional percent-encoding needed.

    

    

      
 JWT payloads

      
JSON Web Tokens (JWTs) use Base64url encoding for their header and payload sections. The payload is a JSON object Base64url-encoded and joined with dots. Understanding the encoding is essential when debugging JWTs — decode the middle section to inspect the claims.

    

    

      
 HTTP headers and configs

      
Some HTTP headers and API authentication schemes pass JSON configurations as Base64-encoded values. Kubernetes secrets, Basic Auth credentials and some webhook configurations use Base64 to safely embed structured data in header values or environment variables.

    

    

      
 CLI tools and environment variables

      
Passing complex JSON to CLI tools or storing it in environment variables (which cannot contain newlines or special characters) is much cleaner with Base64 encoding. The entire JSON config becomes a single safe string that any shell or CI/CD system can handle.

    

  

 
  

 
  
  
Standard Base64 vs URL-safe Base64

  
Two variants — choose based on where you use the encoded string.

  

    
Standard Base64URL-safe Base64 (Base64url)

    
      
CharactersA–Z, a–z, 0–9, +, /A–Z, a–z, 0–9, -, _

      
Padding= added= stripped

      
Safe in URLsNo — + becomes space, / is path separatorYes — safe in query params and path segments

      
Use forFile encoding, data storage, email attachmentsJWT, URL params, filenames, Kubernetes secrets

      
RFCRFC 4648 §4RFC 4648 §5

    
  

 
  

 
  
  

    
      

      
Base64 → JSON

      
Reverse — decode a Base64 string back to formatted JSON.

      
1,700 searches/month

    
    
      

      
JSON → String

      
Escape JSON as a string literal for code embedding.

      
45,310 searches/month

    
    
      

      
JSON Viewer

      
Inspect and validate JSON before encoding to Base64.

      
13,280 searches/month

    
  

 
  
  

    
Popular searches

    

      json to base64
      convert json to base64
      encode json to base64
      json to base64 javascript
      json to base64 online
      json to base64 js
      javascript json to base64
      python json to base64
      json base64 encode
      json to base64 string
      c# json to base64
    

  

 
  

 
  
  

    

      
JSON encoded in your
browser. No upload.

      
The entire encoding runs in JavaScript using the browser's native btoa() function. Your JSON is never sent to any server. URL-safe encoding replaces + with - and / with _ following RFC 4648 §5, and strips the = padding.

      
The code snippets show the idiomatic approach for each language — Buffer.from() in Node.js, base64.b64encode() in Python, and Base64.getEncoder() vs getUrlEncoder() in Java.

    

    

      
btoa() native
Uses the browser's built-in btoa() — no library, no dependency, always available.

      
URL-safe RFC 4648
Correct RFC 4648 §5 implementation — replaces + and /, strips = padding.

      
5 language snippets
JS, Node.js, Python, Java and C# — both standard and URL-safe variants for each.

      
47 tools, always free
No file size limits, no watermarks, no account. Funded by non-intrusive display advertising only.

    

  

 
  
  

    
Frequently asked questions

 
    

      
How do I convert JSON to Base64 in JavaScript?

      
btoa(JSON.stringify(obj)) — but this fails for non-ASCII characters. Use btoa(unescape(encodeURIComponent(JSON.stringify(obj)))) for full Unicode support. In Node.js: Buffer.from(JSON.stringify(obj)).toString('base64'). Select the Code Snippets mode for the complete pattern with error handling.

    

    

      
What is the difference between Base64 and Base64url?

      
Standard Base64 (RFC 4648 §4) uses + and / which are unsafe in URLs. Base64url (RFC 4648 §5) replaces + with - and / with _, and strips the = padding — making it safe for URL parameters, JWT tokens and filenames without percent-encoding. Select URL-safe in the options above for Base64url output.

    

    

      
How do I decode Base64 back to JSON?

      
Use the Base64 to JSON tool. In JavaScript: JSON.parse(atob(base64String)). In Python: import json, base64; json.loads(base64.b64decode(s)). In Node.js: JSON.parse(Buffer.from(s, 'base64').toString()).

    

    

      
Is the JSON to Base64 encoder free?

      
Yes, completely free. No file size limits, no account required. JSONshift is funded by non-intrusive display advertising.

    

  

 


				
	
		
	


			
		
				
	

	
		
		



 

	
	

	
	
	
	
			
		Go up