Bytes to Base64

Category: Data Conversion & Encoding · Node Type ID: converter-bytes-to-base64

Encodes raw byte array into Base64 / Base64URL string

Overview

Encodes a raw byte array (Uint8Array) into an ASCII string using RFC 4648 Base64 (A-Z, a-z, 0-9, +, /) or URL-safe Base64URL (- and _ in place of + and /).

You can also control whether trailing = padding characters are included or stripped, which is required when constructing JWT segments, JWK fields, or URL query tokens.

When to Use

Encoding binary ciphertexts, public keys, or signatures for transport in JSON, HTTP headers, or PEM-style payloads.
Producing unpadded Base64URL strings (Variant = url_safe, Include Padding = false) for JWTs, WebAuthn challenges, or URL tokens.

Parameter Configuration

Parameter (ID)	Type & Default	Visibility Condition	Description & Options
Base64 Variant `variant`	`select` Default: `standard`	Always visible	Selects RFC 4648 §4 `standard` alphabet (`+/`) or RFC 4648 §5 `url_safe` alphabet (`-_`). `standard`: Standard (+/) `url_safe`: URL-Safe (-_)
Include Padding (=) `padding`	`boolean` Default: `true` Supports Variable Reference (`$var`: `bool`)	Always visible	When enabled (`true`), pads the output string with `=` so its length is a multiple of 4. Disable for unpadded Base64URL tokens.

Port I/O Specification

See Ports & Connections for general wiring rules, data type colors, and dynamic port creation.

Input Ports

Port Nature: Fixed Input Ports (1 total).

Port Name	Port ID	Data Type	Required	Visibility Condition	Description
`Bytes In`	`bytes`	`Bytes`	Required	Always visible	Raw byte array (`Uint8Array`) to encode.

Output Ports

Port Nature: Fixed Output Ports (1 total).

Port Name	Port ID	Data Type	Visibility Condition	Description
`Base64 Out`	`string`	`String`	Always visible	Encoded Base64 or Base64URL string.

Error Cases

This node has no runtime failure cases (errorProfile: none) and always succeeds for any valid typed input.

Examples

Encoding a Signature as Unpadded Base64URL for JWT

Format a 64-byte Ed25519 signature for use in a JWT token.

Connect the Signature output of Ed25519 Sign to Bytes to Base64.
Set Base64 Variant to URL-Safe (-_) and uncheck Include Padding (=).