# Apollo v3 -> v4

This article is based on [Migrating to Apollo Server 4](https://www.apollographql.com/docs/apollo-server/migration/) and the current state of the alkemio-server.

## Apollo Server 4 supports Node.js 14.16.0 and later.
Currently **alkemio-server** requires **16.15.0 or later**.

## Apollo Server 4 supports graphql v16.6.0 and later.
**graphql 15.8.0** updated to **16.6.0**.

## If you use Apollo Server with TypeScript, you must use TypeScript v4.7.0 or newer.
**Typescript 4.7.4** is installed which is the latest ** ** version.
In addition, it has been overriden for **@nestjs/schematics@8.0.2**, because it depends on **Typescript 4.3.5**.

"@nestjs/schematics": {
  "typescript": "4.7.4"
}

## Migrate from apollo-server-express
1. Install the @apollo/server
1. Import symbols from @apollo/server (i.e., instead of from apollo-server-express and apollo-server-core).
1. Remove the Apollo Server 3 apollo-server-express and apollo-server-core packages.

## Apollo Server 4 removes both ApolloError and toApolloError in favor of using GraphQLError.
**Everything which extended `ApolloError` now extends `GraphQLError` and uses the below 'new' constructor.**

Old

super(error, code?.toLocaleString());

New

super(error, {
  extensions: { code: code?.toLocaleString() },
});