Base64 Encoding for APIs
Learn how to use Base64 encoding to send binary data (images, files) in JSON API requests and responses. Complete guide with examples.
APIs often need to transmit binary data like images or files. Base64 encoding converts binary data to text, making it compatible with JSON-based APIs.
Why Base64 for APIs?
JSON only supports text data. Base64 encoding allows you to include binary files (images, PDFs, etc.) in JSON payloads without data corruption.
Implementation Example
In JavaScript: btoa(binaryString) encodes to Base64, atob(base64String) decodes. Most languages have built-in Base64 libraries for encoding and decoding.
Performance Considerations
Base64 increases payload size by 33%. For large files, consider using multipart form data or presigned URLs instead of Base64 encoding.
Summary
Base64 is the standard way to include binary data in API payloads. Test your Base64 encoding with our free online tool.