encode

Deterministic encoding, hashing, and JWT inspection for AI agents.

An LLM asked to Base64-encode a string will produce something that looks like Base64 but decodes to garbage. Hash digests, URL-encoding, hex conversions, HMAC signatures — all require exact byte-level computation. Euclid's encode tool handles codecs, cryptographic hashes, and JWT decoding with real algorithms, not token prediction.

Live

euclid / encode

encode({ operation: "base64_encode", input: "api_key:sk_live_09f2..." }){ "result": "YXBpX2tleTpza19saXZlXzA5ZjIuLi4=" }

encode({ operation: "sha256", input: "{\"event\":\"payment.completed\"}" }){ "result": "8c0b38c00caf1c61...64-char hex digest" }

encode({ operation: "hmac", input: "amount=49.99&currency=USD", key: "whsec_...", algorithm: "sha256" }){ "result": "3e4ce76362751e24...64-char hex digest" }

encode({ operation: "jwt_decode", input: "eyJhbGciOiJSUzI1NiJ9.eyJzdWIiOiJ1c2VyXzEyMyJ9.sig" }){ "header": { "alg": "RS256" }, "payload": { "sub": "user_123" } }

Operations

base64 encode / decodebase64url encode / decodehex encode / decodeurl encode / decodehtml encode / decodesha-256sha-512sha-1 / md5hmacjwt decode

Examples

What it looks like in practice

Encoding API credentials for an Authorization header

encode({ operation: "base64_encode", input: "api_key:sk_live_09f2..." })

{ "result": "YXBpX2tleTpza19saXZlXzA5ZjIuLi4=" }

Hashing a webhook payload for signature verification

encode({ operation: "sha256", input: "{\"event\":\"payment.completed\"}" })

{ "result": "8c0b38c00caf1c61...64-char hex digest" }

Computing an HMAC to sign an outbound request

encode({ operation: "hmac", input: "amount=49.99&currency=USD", key: "whsec_...", algorithm: "sha256" })

{ "result": "3e4ce76362751e24...64-char hex digest" }

Inspecting a JWT from an OAuth callback

encode({ operation: "jwt_decode", input: "eyJhbGciOiJSUzI1NiJ9.eyJzdWIiOiJ1c2VyXzEyMyJ9.sig" })

{ "header": { "alg": "RS256" }, "payload": { "sub": "user_123" } }

URL-encoding query parameters for a search API

encode({ operation: "url_encode", input: "price <= 100 & category = \"books\"" })

{ "result": "price%20%3C%3D%20100%20%26%20category%20%3D%20%22books%22" }

HTML-encoding user input before rendering in a template

encode({ operation: "html_encode", input: "<script>alert(1)</script>" })

{ "result": "<script>alert(1)</script>" }

Who uses this

Built for agents across every domain

fn()

Backend engineer

An agent building webhook integrations that must compute HMAC-SHA256 signatures to verify inbound payloads from Stripe, GitHub, and Slack.

fn()

Security analyst

Inspecting JWTs from authentication flows to verify claims, check expiry, and identify misconfigurations without trusting an LLM to decode Base64url.

fn()

DevOps engineer

Encoding secrets as Base64 for Kubernetes manifests and computing SHA-256 checksums to verify downloaded artifacts.

fn()

API developer

URL-encoding query parameters and HTML-encoding user-submitted content to prevent injection attacks in generated API calls and templates.

fn()

Data engineer

Hex-encoding binary identifiers and computing MD5 checksums for data deduplication across terabyte-scale pipelines.

fn()

Compliance officer

An AI agent hashing PII with SHA-256 before logging, ensuring audit trails never contain raw personal data.

Try encode on Euclid Cloud

One MCP connection. Every computation your agents need.

Get started