It doesn't return a large `str` containing the data in JSON format (as a string). It returns a Python standard data structure (e.g. a `dict`) with values and sub-values that are all compatible with JSON.

/// note

`jsonable_encoder` is actually used by **FastAPI** internally to convert data. But it is useful in many other scenarios.

## Example { #example }

For a simple example, let's consider a file structure similar to the one described in [Bigger Applications](../tutorial/bigger-applications.md){.internal-link target=_blank} and [Testing](../tutorial/testing.md){.internal-link target=_blank}:

```
.
├── app
│   ├── __init__.py

package once

import (
	"context"
	"sync"
	"sync/atomic"
)

// Inspired from Golang sync.Once but it is only marked
// initialized when the provided function returns nil.

// Init represents the structure.
type Init struct {
	done uint32
	m    sync.Mutex
}

// Do is similar to sync.Once.Do - makes one successful
// call to the function. ie, it invokes the function
// if it is not successful yet.

 * The local repository serves as a cache for downloaded remote artifacts and storage
 * for locally installed artifacts. This manager provides services to determine the
 * appropriate paths for artifacts within the local repository structure.
 *
 * <p>The LocalRepositoryManager is responsible for:
 * <ul>
 *   <li>Determining the storage path for locally installed artifacts</li>
 *   <li>Managing the layout and organization of cached remote artifacts</li>

          <type>DOM</type>
          <description>
            Toolchain identification information, which will be matched against project requirements.
            &lt;p>Actual content structure is completely open: each toolchain type will define its own format and
            semantics.
            &lt;p>This is generally a properties format: {@code &lt;name&gt;value&lt;/name&gt;} with predefined

	"time"

	"github.com/minio/madmin-go/v3/logger/audit"

	"github.com/minio/minio/internal/handlers"
	xhttp "github.com/minio/minio/internal/http"
)

// Version - represents the current version of audit log structure.
const Version = "1"

// NewEntry - constructs an audit entry object with some fields filled
func NewEntry(deploymentID string) audit.Entry {
	return audit.Entry{
		Version:      Version,

        In the rare cases where this is infeasible, we will also accept a detailed set of instructions.
        You can also use [Gradle Project Replicator](https://github.com/android/project-replicator) to reproduce the structure of your project.
    validations:
      required: true
  - type: input
    id: gradle-version
    attributes:
      label: Gradle version
      description: What version of Gradle are you running?

 resources required to run Maven. Each subsequent plugin realm contains the
 JAR plugin as well as its dependencies. The realms noted above are setup
 in a hierarchical structure where the resources in the parent realms are
 available but the <<realm is searched first before a search is made in
 the parent realm>>.

 Plugins are guaranteed to be provided the resources found in

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting development server 🚀

             Searching for package file structure from directories
             with <font color="#3465A4">__init__.py</font> files
             Importing from <font color="#75507B">/home/user/code/</font><font color="#AD7FA8">awesomeapp</font>

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package notify

import (
	"github.com/minio/minio/internal/event/target"
)

// Config - notification target configuration structure, holds
// information about various notification targets.
type Config struct {
	AMQP          map[string]target.AMQPArgs          `json:"amqp"`
	Elasticsearch map[string]target.ElasticsearchArgs `json:"elasticsearch"`