🎲 Mock or extend your GraphQL API with faked data. No coding required.
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Latest commit 7bce298 Jun 14, 2018


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GraphQL Faker

npm David David npm docker

Mock your future API or extend the existing API with realistic data from faker.js. No coding required. All you need is to write GraphQL IDL. Don't worry, we will provide you with examples in our IDL editor.

In the GIF bellow we add fields to types inside real GitHub API and you can make queries from GraphiQL, Apollo, Relay, etc. and receive real data mixed with mock data. demo-gif

How does it work?

We use @fake directive to let you specify how to fake data. And if 60+ fakers is not enough for you, just use @examples directive to provide examples. Just add a directive to any field or custom scalar definition:

type Person {
  name: String @fake(type: firstName)
  gender: String @examples(values: ["male", "female"])

No need to remember or read any docs. Autocompletion is included!


  • 60+ different types of faked data e.g. streetAddress, firstName, lastName, imageUrl, lorem, semver
  • Comes with multiple locales supported
  • Runs as a local server (can be called from browser, cURL, your app, etc.)
  • Interactive editor with autocompletion for directives with GraphiQL embeded
  • Support for proxying existing GraphQL API and extending it with faked data Extend mode diagram


npm install -g graphql-faker


yarn global add graphql-faker

or run it in a Docker container, see Usage with Docker


Mock GraphQL API based on example IDL and open interactive editor:

graphql-faker --open

Note: You can specify non-existing IDL file names - Faker will use example IDL which you can edit in interactive editor.

Extend real data from SWAPI with faked data based on extension IDL:

graphql-faker ./ext-swapi.grqphql --extend http://swapi.apis.guru

Extend real data from GitHub API with faked data based on extension IDL (you can get token here):

graphql-faker ./ext-gh.graphql --extend https://api.github.com/graphql \
--header "Authorization: bearer <TOKEN>"


graphql-faker [options] [IDL file]

[IDL file] - path to file with IDL. If this argument is omited Faker uses default file name.


  • -p, --port HTTP Port [default: env.PORT or 9002]
  • -e, --extend URL to existing GraphQL server to extend
  • -o, --open Open page with IDL editor and GraphiQL in browser
  • -H, --header Specify headers to the proxied server in cURL format, e.g.: Authorization: bearer XXXXXXXXX
  • --forward-headers Specify which headers should be forwarded to the proxied server
  • --co, --cors-origin CORS: Specify the origin for the Access-Control-Allow-Origin header
  • -h, --help Show help

When specifying the [SDL file] after the --forward-headers option you need to prefix it with -- to clarify it's not another header. For example:

graphql-faker --extend http://example.com/graphql --forward-headers Authorition -- ./temp.faker.graphql

When you finish with an other option there is no need for the --:

graphql-faker --forward-headers Authorition --extend http://example.com/graphql ./temp.faker.graphql

Usage with Docker

docker run -p=9002:9002 apisguru/graphql-faker [options] [IDL file]

To specify a custom file, mount a volume where the file is located to /workdir:

docker run -v=${PWD}:/workdir apisguru/graphql-faker path/to/schema.idl

Because the process is running inside of the container, --open does not work.


npm run build:all
npm run start