Quick Start - API Explorer
This guide is intended as a way to help you discover and familiarize with the APIs, as opposed to integrating it into your project. For that check out the "Quick Start - Integrate" guide.
The best way to get up and running quickly, and able to experiment with the APIs is to run a pre-packaged distributable version of the "full suite" of hREA functionality. How you will run it is similar to how other people in the future may run the application you develop. What you will be accessing is a Graphql Explorer: a system for viewing and running raw Graphql queries without writing any additional code.
Since Holochain is a runtime for local-first software, that is software whose core functions are actually executed 'in the client' and there is no central server, we need to first install that Holochain runtime in the easiest manner possible. Having the runtime will then allow us to install the hREA Graphql Explorer application.
The following tutorial is meant for desktop operating systems, not mobile.

Install the Holochain "Launcher"

The Holochain "Launcher" is available for download freely on Github.
Go here to access the instructions, and the download, for your operating system. Make sure to note the special instructions for your operating system, as the software is still labeled as "Pre-release" and is not yet optimized for user experience.
When you start the Holochain Launcher application it will ask that you set a password, which is used to encrypt your data for security. Make sure you record that password somewhere.
Great, you now are running the Launcher, re-open it anytime you want to continue with this Quick Start guide, or do live experimentation and familiarization with the Graphql API.

Install hREA-graphql-explorer

Go here to download the hrea.webhapp file from under the Assets heading.
Within the Holochain Launcher, click Install New App.
Click Select App From Filesystem.
Find the hrea.webhapp file on your filesystem, and select it.
In the next popup that appears, Install App: hrea_suite, you only need to modify one thing. In the field labeled Install To Holochain Version, select 0.0.162 from the list. Next, click Install App. Wait while it installs. Once it's done, it should take you back to the main page, and you should see 'hrea_suite' and it should say 'Running', which is its status. Click Open to start using the Graphql Explorer application!
The Holochain Launcher runtime is capable of running the small pre-packaged bundles of application logic which are known as hApps (holochainApps). Even more specific than a "hApp" is a "webhapp", which is simply a bundle of web-language (HTML/CSS/Javascript) files and a hApp. The Launcher can also install and run these webhapps by serving the user interface files as well.

Make your first requests

What you should now have in front of you is a "Graphiql" interface. There are multiple panels. The main left panel is for writing your graphql queries, which are how you make requests to the hREA APIs. The right panel is where you will see the system responses to your requests. There are additional hidden trays which contain useful features and information.
There are some pre-filled queries already in the left panel. Via the big Play button in the upper left, you are able to execute any of the queries in the query panel individually.
Let's try the first two, which will first create a profile, and second associate it with yourself. This calls the top-level Graphql "mutation" (data-altering) method createPerson. Replace the text place your name here with your name.
mutation CreatePerson {
createPerson(person: { name: "Connor" }) {
agent {
id
name
}
}
}
Next, click the Play button, and then click the query named CreatePerson, which is just an arbitrary label.
In the right panel, you should see something like this
{
"data": {
"createPerson": {
"agent": {
"id": "uhCEkq8yPJtCDlpM6ZDs__b7lRTDPlMPOy0kZCmp9bcbDxNgmpiIU:uhC0k503kLoDxJNulbKWRjK1J2zxU9PyCZFrAFwmdZZUNrOx4mry2",
"name": "Connor"
}
}
}
}
In Graphql, the shape of the data in the response always matches the shape of the request. There are many other fields that we did not provide or request in our query.
Copy the value of the data.createPerson.agent.id property to your clipboard, as it will be needed for the next queries!
Note that having created the profile is not enough to associate with the local authenticated acting user. We have to call one more mutation method. From your clipboard, replace the text place agent.id here here.
mutation AssociateMyAgent {
associateMyAgent(agentId: "uhCEkq8yPJtCDlpM6ZDs__b7lRTDPlMPOy0kZCmp9bcbDxNgmpiIU:uhC0k503kLoDxJNulbKWRjK1J2zxU9PyCZFrAFwmdZZUNrOx4mry2")
}
To understand these functions in more depth, check out the section on Usign "myAgent".

Continue with other queries and exploration

Now that you've made your first requests, and associated a personal profile, you can easily continue with step 3 from within the graphql explorer, by following the instructions there.
You will be able to access myAgent which will be a very useful query for developing applications.
Here are a few other useful tips.
Check out Thinking & Expressing ValueFlows to start learning the vocabulary and creating Economic Events.
Check out the GraphQL API Reference welcome page in order to view a couple of important details about types of values expected by the API.
Hover with your mouse over a label in order to see any documentation that may be available about that query.
Click on a type like PersonResponse to view any other documentation about it, in the expanded 'Docs' panel.
Open the 'Explorer' to easily modify your query inputs and response values
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On this page
Install the Holochain "Launcher"
Install hREA-graphql-explorer
Make your first requests
Continue with other queries and exploration