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logger

v6 of the library adds logging capability that can aid debugging in the development and production environments.

Configuration

These are the logger-related configuration values that shopifyApi supports. The logger property in the configuration is an object:

import {shopifyApi, LogSeverity} from '@shopify/shopify-api';

const shopify = shopifyApi({
  // other configuration settings
  logger: {
    level: LogSeverity.Debug,
    timestamps: true,
    httpRequests: true,
    log: async (severity, message) => {},
  },
});

This object supports the following values:

Value Type Required Default Description
level LogSeverity No LogSeverity.Info Minimum severity for which to trigger the log function
timestamps boolean No false Whether to add the current timestamp to every log call
httpRequests boolean No false Whether to log ALL HTTP requests made by the package. Only works if level is Debug
log Function No () => void Callback function used for logging, which takes in a LogSeverity value and a formatted message. Defaults to using console calls matching the severity parameter

Adjusting level of log output

Four levels of logging are supported:

export enum LogSeverity {
  Error, // errors that prevent app from functioning properly, e.g., oauth errors
  Warning, // notices that don't prevent app from functioning propertly, e.g., deprecation notices
  Info, // information useful for monitoring library processing (default)
  Debug, // information useful for debugging library processing
}

LogSeverity.Info is the default logging level. To see more information, change the logger.level property in the configuration to LogSeverity.Debug, e.g.,

const shopify = shopifyApi({
  // other config values
  logger: {
    level: LogSeverity.Debug,
  },
});

For production environments, LogSeverity.Info may be too verbose, so consider adjusting the production environment configuration to LogSeverity.Error or LogSeverity.Warning.

Adding timestamp information to log messages

By default, a typical log message looks like this (LogSeverity.Info example):

[shopify-api/INFO] Completing OAuth | {shop: my-test-shop.myshopify.com, isOnline: false}

The following configuration adds timestamps to the messages logged:

const shopify = shopifyApi({
  // other config values
  logger: {
    timestamps: true,
  },
});

Using the same log message example above, it would now look like:

[2022-11-10T22:15:51Z] [shopify-api/INFO] Completing OAuth | {shop: my-test-shop.myshopify.com, isOnline: false}

Debugging HTTP requests

To enable additional debug messages that indicate the sending and receiving of HTTP requests/responses by the library, set the following configuration:

const shopify = shopifyApi({
  // other config values
  logger: {
    level: LogSeverity.Debug,
    httpRequests: true,
  },
});

This will result in messages like the following examples being logged.

[shopify-api/DEBUG] Making HTTP request  -  GET https://my-test-shop.myshopify.com/admin/api/2022-10/products/count.json  -  Headers: {"X-Shopify-Access-Token":["a-really-fake-example-access-token"],"User-Agent":["Shopify API Library v6.0.0 | Node v18.7.0"]}
[shopify-api/DEBUG] Completed HTTP request, received 200 OK

Note: Setting httpRequests: true will only have effect if the logging level is set to LogSeverity.Debug.

Changing the logging function

With the default configuration, the following calls are equivalent.

logger call default behaviour
shopify.logger.log(LogSeverity.Error, "error message") console.error("[shopify-api/ERROR] error message")
shopify.logger.log(LogSeverity.Warning, "warning message") console.warn("[shopify-api/WARNING] warning message")
shopify.logger.log(LogSeverity.Info, "information message") console.log("[shopify-api/INFO] information message")
shopify.logger.log(LogSeverity.Debug, "debug message") console.debug("[shopify-api/DEBUG] debug message")

Setting the log property of the logger configuration object to an async function that accepts two arguments - a severity (of type LogSeverity) and a formatted message (of type string) - allows the developer to redirect the log messages as they see fit, e.g., to a file or a log capture service.

Example of changing the logging function

The following example writes all messages to a log file application.log, and LogSeverity.Error-only messages to error.log.

import {shopifyApi} from '@shopify/shopify-api';
import {writeFileSync} from 'fs';

const errorLogFile = './error.log';
const appLogFile = './application.log';

const myLoggingFunction = (severity, message) => {
  writeFileSync(appLogFile, `${message}\n`, {flag: 'a'});
  if (severity == LogSeverity.Error) {
    writeFileSync(errorLogFile, `${message}\n`, {flag: 'a'});
  }
};

const shopify = shopifyApi({
  // other config values
  logger: {
    log: myLoggingFunction,
  },
});

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