API Development and Testing
Quickly encode credentials to Base64 for Basic Authentication headers, decode API responses, or validate JSON payloads from external services during integration testing.
Encode, decode, prettify, validate, or derive types from payloads.
Result
Run the tool to see the result here
Overview
Data Converter is a versatile multi-purpose tool that handles common data encoding, decoding, formatting, and validation tasks in web development. With 10 different operations in one interface, it saves you from switching between multiple tools when working with Base64, URL encoding, JSON formatting, TypeScript type generation, and JWT token inspection.
Use Cases
JWT Token Debugging
Decode JWT (JSON Web Token) headers and payloads to inspect claims, expiration times, and token metadata without revealing the signature. Essential for debugging authentication issues.
JSON Data Formatting
Format minified JSON responses for better readability during debugging, or compact large JSON files to reduce size before transmission or storage.
TypeScript Interface Generation
Automatically generate TypeScript interfaces from JSON API responses, saving time and reducing errors when creating type definitions for external data sources.
URL Parameter Handling
Encode special characters in URL query parameters to ensure they're safely transmitted, or decode URL-encoded strings received from forms or query parameters.
How to Use
Select Operation Mode
Choose from 10 different operations: Base64 encode/decode, URL encode/decode, JSON formatting/validation, TypeScript type generation, or JWT decoding.
Paste Your Data
Enter or paste the content you want to process. The tool accepts various formats including plain text, JSON objects, JWT tokens, or URL-encoded strings.
Run and Copy Result
Click "Run converter" to process your data. The result appears instantly and can be copied to your clipboard with one click.
Frequently Asked Questions
What is Base64 encoding used for?
Base64 encoding converts binary data or text into ASCII characters, making it safe to transmit over text-based protocols like HTTP, email, or JSON. It's commonly used for encoding images in data URLs, Basic Authentication credentials, and embedding binary data in JSON or XML.
Can I decode JWT tokens safely with this tool?
Yes, this tool only decodes the header and payload sections of JWT tokens, which are not encrypted (just base64-encoded). It does NOT verify the signature, so you can safely inspect tokens without compromising security. The signature remains intact and is not processed.
How accurate is the JSON to TypeScript converter?
The converter provides a good starting point by inferring basic types (string, number, boolean, arrays, objects) from your JSON structure. However, you may need to refine the generated types for union types, optional fields, or more complex nested structures.
When should I use URL encoding?
Use URL encoding (percent-encoding) when you need to include special characters in URL query parameters or path segments. Characters like spaces, &, =, ?, and non-ASCII characters must be encoded to ensure they're correctly interpreted by web servers and browsers.