Decode MIME encoded-word API

Decodes RFC2047 MIME encoded-words (=?charset?B/Q?text?=) found in email headers, handling both Base64 and Q-encoding and collapsing whitespace between adjacent words. Answers 'What does this encoded email subject say?', 'Decode a =?UTF-8?B?…?= header.'

Price$0.02per request

MethodPOST

Route/v1/encoding/mime-word-decode

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

mimeencoded-wordrfc2047email-headerdecodebase64q-encodingencoding

API URLhttps://x402.hexl.dev/v1/encoding/mime-word-decode

Integration docs

Example request

{
  "value": "=?UTF-8?B?SGVsbG8gV29ybGQ=?="
}

Example response

{
  "decoded": "Hello World",
  "words": [
    {
      "charset": "UTF-8",
      "encoding": "B",
      "text": "Hello World"
    }
  ],
  "interpretation": "Decoded 1 MIME encoded-word(s) to 'Hello World'."
}

Input schema

{
  "type": "object",
  "required": [
    "value"
  ],
  "properties": {
    "value": {
      "type": "string",
      "examples": [
        "=?UTF-8?B?SGVsbG8gV29ybGQ=?="
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}