Base64 Encoder/Decoder API Reference

Overview

Base64 Encoder/Decoder works by converting text to Base64 encoding or decoding Base64 strings back to readable text. Returns the converted result along with length information.

Endpoint

One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.

GEThttps://api.apiverve.com/v1/base64

curl "https://api.apiverve.com/v1/base64?text=Hello%20World&action=encode" \
  -H "x-api-key: your_api_key_here"

const res = await fetch('https://api.apiverve.com/v1/base64?text=Hello%20World&action=encode', {
  headers: { 'x-api-key': 'your_api_key_here' },
});

if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);

const { data } = await res.json();
console.log(data);

import requests

res = requests.get(
    "https://api.apiverve.com/v1/base64?text=Hello%20World&action=encode",
    headers={"x-api-key": "your_api_key_here"},
    timeout=15,
)
res.raise_for_status()

print(res.json()["data"])

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/base64?text=Hello%20World&action=encode", nil)
	req.Header.Set("x-api-key", "your_api_key_here")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}

Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.

Authentication

Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Parameters

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them.

Parameter	Type	Description
`text`Required	string	The text to encode
`action`Optional	string	The action to perform `encodedecode` default encode

Response

Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "action": "encode",
    "original": "Hello World",
    "encoded": "SGVsbG8gV29ybGQ=",
    "length": 16
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`action`	string	`"encode"`	The action performed on the text
`original`	string	`"Hello World"`	The original Base64 encoded string input
`encoded`	string	`"SGVsbG8gV29ybGQ="`	The decoded text result from Base64 string
`length`	number	`16`	Length of the original Base64 encoded string

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted	A key restriction or IP allow-list; see key scoping.
`429`	Rate limited, or out of credits	Read `error` to tell them apart; see rate limits.

Use cases

Data Transmission: Encode binary data as Base64 for safe transmission over text-based protocols like email or HTTP
API Integration: Encode credentials or sensitive data in Base64 format for API authentication headers
File Embedding: Encode images or files as Base64 strings to embed them directly in HTML, CSS, or JSON
Data Storage: Convert binary data to Base64 for storage in text-based databases or configuration files

Other ways to use Base64 Encoder/Decoder

Set up Base64 Encoder/Decoder on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKit →Reference →

Use it in Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheets →Reference →

Base64 Encoder/Decoder