Question:
I'm using AWS CDK (v2) with TypeScript to configure Lambda functions using values stored in SSM String parameters with JSON format. While the parameter stores valid JSON, I'm having trouble properly parsing the values during synthesis.
Current Setup Parameter Format: Stored as a String parameter with JSON:
{"small":256,"medium":512,"large":768,"extraLarge":1024}
Parameter Creation:
new ssm.StringParameter(this, 'LambdaMemory', {
parameterName: `${stage}-LambdaMemory`,
stringValue: JSON.stringify({
small: 256,
medium: 512,
large: 768,
extraLarge: 1024
}),
type: ssm.ParameterType.STRING
});
What I've Tried Approach 1: Direct JSON parsing
const config = JSON.parse(
ssm.StringParameter.valueForStringParameter(this, `${stage}-LambdaMemory`)
);
Issue: Fails during synthesis with token resolution errors
Approach 2: Token-aware parsing
const paramValue = ssm.StringParameter.valueForStringParameter(this, `${stage}-LambdaMemory`);
const config = {
small: cdk.Token.asNumber(cdk.Fn.select(1, cdk.Fn.split('"small":', cdk.Fn.select(0, cdk.Fn.split(',"medium":', paramValue))))),
medium: cdk.Token.asNumber(cdk.Fn.select(1, cdk.Fn.split('"medium":', cdk.Fn.select(0, cdk.Fn.split(',"large":', paramValue))))),
// ...similar for other fields
};
Issue: Results in invalid values (e.g., scientific notation like -1.888e+289)
How can I properly parse JSON-formatted SSM parameters during CDK synthesis?
I'd like to have something like this:
const performWorkLambda = new NodejsFunction(this, 'PerformWorkLambda', {
entry: join(__dirname, '../../src/lambdas/performWork/index.ts'),
handler: 'handler',
functionName: `${id}-PerformWorkLambda`,
environment: {
...environment,
PERSIST_QUEUE_URL: AUDIT_QUEUE_URL,
UPDATE_QUEUE_URL,
AUDIT_TABLE_NAME
},
role: lambdaExecutionRole,
memorySize: lambdaMemoryConfig.large,
timeout: cdk.Duration.seconds(
lambdaTimeoutConfig.extraLarge
)
})
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