parse-github-gql-global-id

Encode and decode GitHub's new GraphQL global node IDs.

GitHub's GraphQL API returns node IDs like U_kgDOEAluNg or R_kgDOACN7Mg. These are MessagePack-encoded arrays containing the object's database ID, base64url-encoded with a type prefix. This library lets you construct these IDs from database IDs and extract database IDs from them.

Install

pnpm add parse-github-gql-global-id

Usage

import {
  encodeUserNodeId,
  encodeRepoNodeId,
  encodeNodeId,
  decodeNodeId,
  extractDatabaseId,
} from 'parse-github-gql-global-id';

// Encode database IDs into node IDs
encodeUserNodeId(1);         // "U_kgAB" (mojombo)
encodeRepoNodeId(2325298);   // "R_kgDOACN7Mg" (torvalds/linux)

// Encode other object types
encodeNodeId('PullRequest', 123456);
encodeNodeId('PullRequestReviewComment', repoDbId, commentDbId);

// Decode node IDs
decodeNodeId('U_kgDOEAluNg');
// { prefix: "U_", ids: [269053494] }

// Extract just the database ID
extractDatabaseId('R_kgDOACN7Mg'); // 2325298

Supported types

Type	Prefix
User	U_
Repository	R_
Issue	I_
PullRequest	PR_
PullRequestReviewComment	PRRC_

How it works

GitHub's new global IDs follow this format:

PREFIX_ + base64url(msgpack([0, ...databaseIds]))

The first element is always 0 (version). Users and repos have one ID. Repo-scoped objects (issues, PRs, comments) include the repo's database ID followed by the object's database ID.

Based on the reverse-engineering work from Greptile's blog post.