Create a Log stream URL for AWS CloudWatch Logs from AWS Lambda request context

Sometime we want to get the Lambda execution’s log stream URL on AWS CloudWatch Logs.

And we can create this URL in your Lambda function.

Code

import { Handler } from 'aws-lambda'
export const handler: Handler = async (event, _context) => {
    const logStreamURL = [
        "https://console.aws.amazon.com/cloudwatch/home?region=",
        process.env.AWS_REGION || process.env.AWS_DEFAULT_REGION,
        "#logsV2:log-groups/log-group/",
        encodeURIComponent(_context.logGroupName),
        '/log-events/',
        encodeURIComponent(_context.logStreamName)
    ].join('')
    return logStreamURL
}

Note

If you using the example code, please keep in mind we have to set an env parameter as similar to Lambda.

The code request to use AWS_REGION or AWS_DEFAULT_REGION parameter.So, if we execute your Lambda function outside AWS Lambda, we need to set it manually. Or, if these props are undefined, the URL should be null.

import { Context } from 'aws-lambda'

const getLogStreamURL = (context?: Context): string | null => {
    const region = process.env.AWS_REGION || process.env.AWS_DEFAULT_REGION
    if (!region || !context) return null

    const logStreamURL = [
        "https://console.aws.amazon.com/cloudwatch/home?region=",
        region,
        "#logsV2:log-groups/log-group/",
        encodeURIComponent(context.logGroupName),
        '/log-events/',
        encodeURIComponent(context.logStreamName)
    ].join('')
    return logStreamURL
}