Install

json‑seal is a small, dependency‑free package built on the WebCrypto API.

It works in modern Node runtimes with SubtleCrypto support and in all evergreen browsers.

npm install json-seal

Other install methods

# yarn
yarn add json-seal

# pnpm
pnpm add json-seal

# bun
bun add json-seal

Deno

Use the npm compatibility layer:

import {
  generateKeyPair,
  signPayload,
  verifyBackup
} from "npm:json-seal";

Browser (no bundler)

Use an import map to load json‑seal directly:

<script type="importmap">
{
  "imports": {
    "json-seal": "https://esm.sh/json-seal"
  }
}
</script>

<script type="module">
  import {
    generateKeyPair,
    signPayload,
    verifyBackup
  } from "json-seal";

  const { publicKey, privateKey } = await generateKeyPair();

  const sealed = await signPayload({ message: "hello" }, privateKey, publicKey);
  const result = await verifyBackup(sealed);
</script>

No build steps, frameworks, or external cryptography libraries are required.

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