📄 tanstack/query/v4/docs/framework/react/guides/custom-logger

const queryClient = new QueryClient({
  logger: {
    log: (...args) => {
      // Log debugging information
    },
    warn: (...args) => {
      // Log warning
    },
    error: (...args) => {
      // Log error
    },
  },
})


const queryClient = new QueryClient({
  logger: {
    log: (...args) => {
      // Log debugging information
    },
    warn: (...args) => {
      // Log warning
    },
    error: (...args) => {
      // Log error
    },
  },
})

Deprecated

Custom loggers have been deprecated and will be removed in the next major version. Logging only has an effect in development mode, where passing a custom logger is not necessary.

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