Dev
Mock GraphQL Mutation Generator
Writing GraphQL mutation strings by hand for every test case is repetitive: mutation keyword, named operation, typed variable definitions, input argument, and a selection set on the return value. Miss any one and the mutation is malformed. A mock GraphQL mutation generator automates this for eight resource types across five operation categories. The `mutationType` input controls what gets generated. 'create' mutations accept name, status, active, and count inputs, returning id, name, status, and createdAt. 'update' mutations accept an ID plus partial input, returning id, status, and updatedAt. 'delete' mutations accept an ID and return success, message, and deletedId. 'auth' mutations produce login (with email/password), refreshToken, and logout patterns with JWT-shaped return values. 'mixed' combines all four types randomly.
How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Select a mutation type from the dropdown — choose create, update, delete, or an authentication operation like login.
- Set the count field to how many distinct mutation strings you want generated in one batch.
- Click Generate to produce the mutation documents and review them in the output panel.
- Copy any mutation you want to use and paste it into GraphQL Playground, your test file, or your API client.
- Adjust field names and variable types to match your actual schema before running against a live endpoint.
Use Cases
- •Seeding Apollo Client unit tests with realistic create and update mutation fixtures
- •Populating GraphQL Playground with working demo operations during team onboarding
- •Generating auth mutations like login and signup for MockedProvider security test cases
- •Producing delete mutation batches to stress-test cascading resolver logic in staging
- •Creating tutorial code samples for a Substack or course without writing GraphQL boilerplate
Tips
- →Generate update and delete mutations together when testing resolver chains — IDs in delete mutations often depend on update responses.
- →Use the authentication mutation type to get login and signup templates; these include token fields that are tedious to write from scratch.
- →If your schema uses custom scalar types like DateTime or UUID, find them in the generated output and swap the placeholder types before executing.
- →Generate a batch of five or more create mutations and compare the field variation — useful for spotting which optional fields your resolver actually needs.
- →Paste a generated mutation into the Apollo Client Devtools query editor to test cache behavior without writing a full React component first.
- →When writing MSW (Mock Service Worker) handlers for GraphQL, use the operation names from generated mutations to match requests by name rather than by body.
FAQ
how do I use generated mutations in apollo client tests
Copy the mutation string, wrap it with gql from @apollo/client, then pass it to MockedProvider's mocks array alongside a matching variables object and mock response. The generated mutations give you a realistic structure covering field names and variable patterns, so you only need to align them with your actual schema before wiring into tests.
are the generated mutations valid graphql syntax
Yes — each mutation uses correct GraphQL syntax: the mutation keyword, a named operation, variable definitions with types (String, ID, Boolean, Int), argument passing, and a selection set on the return value. They parse without errors in any spec-compliant tool. They will not execute against a real schema unless that schema defines matching operation names, input types, and return fields.
what is the difference between the mutation types in this generator
Create mutations include a full input object with name, status, active, and count fields. Update mutations pass an ID plus a partial input (status and active only). Delete mutations accept only an ID and return a success boolean. Auth mutations cover login, token refresh, and logout with credential inputs and JWT-shaped return values. Mixed mode combines all four types randomly in a single batch.
can I use these mutation strings in graphql playground or apollo studio
Yes — paste any generated mutation directly into GraphQL Playground's operation editor or Apollo Studio's sandbox. If your schema defines a matching operation, it will execute. If not, you will see a validation error showing which field names need to be aligned. This makes generated mutations useful for prototyping: paste, observe the validation errors, and use them as a guide for what your schema needs to define.
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