Validation Utilities

Validate Base64

Validates Base64-encoded strings to ensure proper formatting and encoding compliance. Use via MCP in Cursor or Windsurf, or call GET /v1/validate/base64 directly. Returns boolean validation status plus detailed error information for malformed strings. Handles padding requirements and character set validation according to RFC 4648 specifications.

API Endpoint

GET /v1/validate/base64

Code Examples

curl "https://tinyfn.io/v1/validate/base64" \
  -H "X-API-Key: YOUR_API_KEY"
const response = await fetch('https://tinyfn.io/v1/validate/base64', {
  headers: { 'X-API-Key': 'YOUR_API_KEY' }
});
const data = await response.json();
console.log(data);
import requests

response = requests.get('https://tinyfn.io/v1/validate/base64',
    headers={'X-API-Key': 'YOUR_API_KEY'})
data = response.json()
print(data)

Use via MCP

Add to your AI agent

Connect your AI agent (Claude, Cursor, Windsurf, etc.) to TinyFn's validation tools:

{
  "mcpServers": {
    "tinyfn-validation": {
      "url": "https://tinyfn.io/mcp/validation",
      "headers": {
        "X-API-Key": "YOUR_API_KEY"
      }
    }
  }
}

Learn more about MCP setup →

Related Tools

Validate Email
Validate an email address.
Validate Url
Validate a URL.
Validate Phone
Validate a phone number.
Validate Credit Card
Validate a credit card number using Luhn algorithm.
Validate Uuid
Validate a UUID.
Validate Ip
Validate an IP address (v4 or v6).
Validate Mac
Validate a MAC address.
Validate Json
Validate JSON syntax.

FAQ

How do I validate Base64 strings in my AI agent workflow?

Use the MCP tool in Cursor, Windsurf, or other supported editors. The tool returns true/false validation status plus specific error details for debugging malformed encodings.

What makes a Base64 string invalid?

Invalid characters outside A-Z, a-z, 0-9, +, /, incorrect padding (= symbols), or length not divisible by 4 after padding removal.

Does this validator handle URL-safe Base64?

Standard Base64 validation follows RFC 4648. For URL-safe variants (using - and _ instead of + and /), check if the tool accepts those character substitutions.

Can I validate Base64 without decoding the actual content?

Yes, this performs format validation only. It checks encoding compliance without decoding to binary data, making it fast for large strings.

What response format does the validation endpoint return?

Returns JSON with validation boolean and error details. Useful for form validation, data pipeline checks, and API input sanitization.

Try Validate Base64 Now

Get your free API key and start using Validate Base64 in seconds.

Get Free API Key