GitHub Application

GraphQL Inspector App is a GitHub Application that you can install in any of your repositories.

GraphQL Inspector App checks your Pull Request to find breaking changes (and others) in a GraphQL Schema, against your master branch.

We strongly believe in Open Source and that’s why we made it possible to have a per-repository, self-hosted GraphQL Inspector App thanks to GitHub Actions or to host your own instance in the Cloud.

Main Features

• Detect changes
• Schema change notifications
• In-Code annotations
• Intercept checks with serverless functions
• Use many environments
• Use live and running GraphQL endpoints

Installation

GraphQL Inspector App comes with a free plan and that’s the only plan.

Visit the application on marketplace and enable it in your project:

Pick a free plan:

Select repositories and click Install:

Usage

Configure GraphQL Inspector in .github/graphql-inspector.yaml:

branch: master
schema: schema.graphql # an output of `$ graphql-inspector introspect ...`

It’s also possible to setup everything in package.json (it must be placed in the root directory).

{
  // ...
  "graphql-inspector": {
    "branch": "master",
    "schema": "schema.graphql"
  }
}

For example, schema.graphql points to a file in the root directory of a repository.

Features

Schema Change Notifications

To stay up to date with changes in your GraphQL Schema and to receive notifications on Slack, Discord or even via WebHooks, read the “Notifications” chapter.

Annotations

In some cases, you want to get a summary of changes but no annotations on a schema file. Annotations are enabled by default but to disable them, please follow the instructions in “Annotations” chapter.

Detection of changes

By default, GraphQL Inspector fails the Pull Request when it detects some breaking changes.

To force a successful check just set failOnBreaking to false or apply the approved-breaking-change label.

Using GraphQL Endpoint

Read more about using live and running GraphQL endpoint as a source of schema.

Using Multiple environments

Read more about managing many environments.

Intercept Checks With Serverless Functions

Learn how to remotely control detected changes and accept/reject Pull Requests.

Other

Approved Breaking Change Label

Label to mark Pull Request introducing breaking changes as safe and expected

(approved-breaking-change by default)

You can customize the label’s name in diff.approveLabel option (see Full configuration below).

Limit Summary Length

The length of a summary of a CI check is limited by GitHub API. This is why we decided to show only a list of 100 changes.

(100 by default)

You can adjust the limit as you wish using diff.summaryLimit option (see Full configuration below).

Experimental

experimental_merge

(true by default)

Merge Pull Request’s branch with the target branch to get the schema. Helps to get the correct state of schema when Pull Request is behind the target branch.

Full Configuration

# Enabling / Disabling Schema Diff
diff: true # enabled by default
 
# Customizing Schema Diff
diff:
  # Pull Request annotations (enabled by default)
  annotations: true
  # Fail on breaking changes or force SUCCESS when disabled (enabled by default)
  failOnBreaking: true
  # Intercept list of detected changes and decide whether to accept a Pull Request
  intercept: '<url>'
  # Merge Pull Request's branch with the target branch to get the schema (enabled by default)
  experimental_merge: true
  # Label to mark Pull Request introducing breaking changes as safe and expected ('approved-breaking-change' by default)
  approveLabel: approved-breaking-change
  # Limit a list of changes in summary to max 150
  summaryLimit: 150
 
# Notifications (disabled by default)
notifications:
  slack: 'webhook url'
  discord: 'webhook url'
  webhook: 'webhook url'
 
# Your main / target branch
branch: master
 
# A path to a schema file
schema: schema.graphql
 
# Use live and running endpoint as a source of schema
endpoint: '<url>'

Recommended workflow

We recommend to automate the generation of schema.graphql and use husky to run $ graphql-inspector introspect:

{
  // ...
  "scripts": {
    "graphql:save": "graphql-inspector introspect schema.js --write schema.graphql"
  },
  "husky": {
    "hooks": {
      "pre-commit": "pnpm graphql:save && git add schema.graphql"
    }
  }
}

This way your schema file is always up to date with your actual schema.

Now on every commit or every Pull Request, the GraphQL Inspector App will annotate every change, next to the line in the code where it happened.

Deploy your own GraphQL Inspector App

We strongly believe in Open Source and that’s why we made it possible to host your instances of the GraphQL Inspector App.

There’s a well-written “Deployment” chapter on Probot’s documentation.