如何在调试模式下设置 graphql-js 模块

Question

i'm new in graphql and setting up server graphql api use [ https://github.com/graphql/graphql-js] graphql-js .

I followed their document and everything work, expect 1 problem:

• when make query and got error from deep module, graphql-js try catch error and return result with errors: [...] property, but in terminal console say nothing. I would like force grahql-js return actual Error object so i can debug issue when looking to stack.

this is code in api

query: (ctx) -> (
      await graphql(
        schema
        query
        context
        graphContext
        variables
      )
    )

I search a lot of topic but no ones say about set this package in debug mode, also no see any parameter allow set debug. Anyone know about this?

Thanks !

Answer 1

Normally, you would use a library like express-graphql or apollo-server (or apollo-server-express , apollo-server-hapi , etc.) to provide an endpoint for your GraphQL API. Unless your use case prohibits you from doing so, I would strongly encourage you to utilize one of these libraries since they provide a number of additional features that are helpful in both development and production.

You can add logging to your endpoint when using one of these libraries simply by providing a custom formatError function in your configuration. See each library's documentation here and here . As a bonus, if you use Apollo, then the full stack trace will be exposed inside of your errors array anyway, but only in development.

If you're calling the graphql function directly in your code somewhere, then you can just log the errors yourself. The call to graphql returns a Promise that resolves to a ExecutionResult object, which includes both your data and errors. So you can do something like:

const result = await graphql(/* your args */)
if (result.errors) {
  result.errors.forEach((error) => {
    // log the error
  })
}

Answer 2

您必须在启用调试选项的情况下实例化图形对象，如下所示

var graph = graphql("/api", { debug: true })