I'm trying to use stackreferences. project1 : the stack output is a json object projectInfo = { "key1": "value1", "key2" : "value2" }. project2: read the stack reference from project1, and then use the value of "key1" in the project2.

To use a StackReference in Pulumi, you need to first ensure that project1 exports the required data as stack outputs. Then in project2, you can create a StackReference to project1 and access the outputs.

Here's how you can do this in TypeScript:

import * as pulumi from "@pulumi/pulumi";

// In project1's Pulumi program
// Export the projectInfo object
export const projectInfo = {
    "key1": "value1",
    "key2": "value2",
};

// In project2's Pulumi program
// Create a StackReference to project1
const project1StackRef = new pulumi.StackReference("myOrgOrUser/project1/stackName");

// Access the "key1" value from project1's exported outputs
const key1Value = project1StackRef.getOutput("projectInfo").apply(info => info.key1);

// Now you can use key1Value in your resource definitions as needed
// For example, you might use it to set an environment variable on a cloud service

Remember to replace "myOrgOrUser/project1/stackName" with the correct organization (or user) name, project name, and stack name for project1.

The apply method is used to access the value of key1 because getOutput returns a Promise that resolves with the output value. The apply method allows you to work with the value inside the promise.