JSONPlaceholder Connector for AI agents.

21 live capabilities

Test your agent's ability to handle REST API requests with real mock data.

Live agent request JSONPlaceholder / Connector

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AI Agent

Why people use JSONPlaceholder

JSONPlaceholder Mock API for Testing Agentic Workflows

This Connector changes that by giving your agent a live, predictable target. You can let your agent actually post content, update statuses, and fetch nested comments. You get a realistic testbed that behaves like a real web service, letting you debug your agent's logic with confidence.

What Vinkius changes

You get a ready-to-use mock REST API for testing agent logic immediately.

Use it from Claude, ChatGPT, Cursor or another AI client you already have.

One account · 5,900+ Connectors

Real-world use case 01

Testing a personal task manager

A developer wants to see if an agent can manage a todo list.
Real-world use case 02

Demoing a photo gallery

A designer wants to show a prototype of a photo app.
Real-world use case 03

Simulating a social media manager

A researcher is testing an agent that manages content.

Complete set · 21capabilities

The complete JSONPlaceholder capability set.

These are the exact actions your AI can choose when you ask it to work with JSONPlaceholder.

Capability set01 / 06

01—04

4 capabilities in this set.

Part of 21 available through JSONPlaceholder.

01 Capability
Get post comments
Retrieve all comments linked to a specific post. Use this to simulate fetching discussion threads.
02 Capability
Get post
Get the details of a specific post. Use this to test how your agent reads full content bodies.
03 Capability
Get todo
Fetch a specific todo item by its ID. Use this to check the status of a single task.
04 Capability
Get user albums
Get all albums belonging to a specific user. Use this to test user-specific data filtering.

Capability set02 / 06

05—08

4 capabilities in this set.

Part of 21 available through JSONPlaceholder.

05 Capability
Create post
Create a new post entry in the mock database. Use this to test how your agent handles new data submission.
06 Capability
Delete post
Remove a post by its ID. This lets you verify deletion logic in your agent's workflow.
07 Capability
Get album photos
Fetch all photos associated with a specific album. Use this to test nested data retrieval.
08 Capability
Get album
Retrieve the details of a specific album. This is perfect for testing ID-based lookups.

Capability set03 / 06

09—12

4 capabilities in this set.

Part of 21 available through JSONPlaceholder.

09 Capability
Get comment
Get a specific comment by its unique ID. Use this to simulate reading individual thread replies.
10 Capability
Get photo
Fetch a single photo by its ID. This helps test specific media asset retrieval.
11 Capability
Get user posts
Fetch all posts created by a specific user. Use this to test content filtering by author.
12 Capability
Get user todos
Retrieve all todos for a specific user. Use this to verify personal task lists.

Capability set04 / 06

13—15

3 capabilities in this set.

Part of 21 available through JSONPlaceholder.

13 Capability
Get user
Get the profile details of a specific user. Use this to test fetching account information.
14 Capability
List albums
List all albums in the system. Use this to test general data discovery.
15 Capability
List comments
List all comments across the platform. Use this to test bulk comment retrieval.

Capability set05 / 06

16—18

3 capabilities in this set.

Part of 21 available through JSONPlaceholder.

16 Capability
List photos
List all photos in the mock database. Use this to test broad media queries.
17 Capability
List posts
List all posts available in the system. Use this to test general feed retrieval.
18 Capability
List todos
List all todos in the system. Use this to test bulk task viewing.

Capability set06 / 06

19—21

3 capabilities in this set.

Part of 21 available through JSONPlaceholder.

19 Capability
List users
List all users in the system. Use this to test user discovery.
20 Capability
Patch post
Perform a partial update on an existing post. Use this to test specific field modifications.
21 Capability
Update post
Replace an entire post with new data. Use this to test full record overwrites.

Set up in minutes

One URL. Then ask JSONPlaceholder to work.

Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use JSONPlaceholder from the conversation.

Choose your client

Live preview

Advanced clients IDE · CLI

Claude · Web + desktop

Official guide ↗

Connector URL · ready to paste

Streamable HTTP

https://edge.vinkius.com/vk_preview_ohXeJdyomPPxcuW3YXJrFT1qXBIHrPlFiE1K9RoA/mcp

Step 01

Open Connectors

In Claude Web or Claude Desktop, open Settings and choose Connectors.
Step 02

Add the URL

Choose Add custom connector, name it JSONPlaceholder, and paste the URL above.
Step 03

Turn it on in chat

Select +, open Connectors, and enable JSONPlaceholder for the conversation.

ChatGPT · Web + desktop

Official guide ↗

Connector URL · ready to paste

Streamable HTTP

https://edge.vinkius.com/vk_preview_ohXeJdyomPPxcuW3YXJrFT1qXBIHrPlFiE1K9RoA/mcp

Step 01

Open MCP settings

On desktop, open Settings and MCP servers. On web, open your workspace app or connector settings.
Step 02

Add the URL

Choose Add server with Streamable HTTP, or create a custom MCP app, then paste the JSONPlaceholder URL.
Step 03

Save and start

Save the connection and enable JSONPlaceholder in your conversation. Desktop may ask you to restart once.

Cursor · IDE configuration

Official guide ↗

Advanced setup

{
  "mcpServers": {
    "jsonplaceholder": {
      "url": "https://edge.vinkius.com/vk_preview_ohXeJdyomPPxcuW3YXJrFT1qXBIHrPlFiE1K9RoA/mcp"
    }
  }
}

Step 01

Open MCP Settings

Press Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) → search "MCP Settings"
Step 02

Add the server config

Paste the JSON configuration above into the mcp.json file that opens
Step 03

Save the file

Cursor will automatically detect the new Connector
Step 04

Start using JSONPlaceholder

Open Agent mode in chat and ask: "Using JSONPlaceholder, help me...". 21 tools available

VS Code Copilot · IDE configuration

Official guide ↗

Advanced setup

{
  "mcpServers": {
    "jsonplaceholder": {
      "url": "https://edge.vinkius.com/vk_preview_ohXeJdyomPPxcuW3YXJrFT1qXBIHrPlFiE1K9RoA/mcp"
    }
  }
}

Step 01

Create MCP config

Create a .vscode/mcp.json file in your project root
Step 02

Add the server config

Paste the JSON configuration above
Step 03

Enable Agent mode

Open GitHub Copilot Chat and switch to Agent mode using the dropdown
Step 04

Start using JSONPlaceholder

Ask Copilot: "Using JSONPlaceholder, help me...". 21 tools available

Windsurf · IDE configuration

Official guide ↗

Advanced setup

{
  "mcpServers": {
    "jsonplaceholder": {
      "url": "https://edge.vinkius.com/vk_preview_ohXeJdyomPPxcuW3YXJrFT1qXBIHrPlFiE1K9RoA/mcp"
    }
  }
}

Step 01

Open MCP Settings

Go to Settings → MCP Configuration or press Cmd+Shift+P and search "MCP"
Step 02

Add the server

Paste the JSON configuration above into mcp_config.json
Step 03

Save and reload

Windsurf will detect the new server automatically
Step 04

Start using JSONPlaceholder

Open Cascade and ask: "Using JSONPlaceholder, help me...". 21 tools available

Cline · IDE configuration

Official guide ↗

Advanced setup

{
  "mcpServers": {
    "jsonplaceholder": {
      "url": "https://edge.vinkius.com/vk_preview_ohXeJdyomPPxcuW3YXJrFT1qXBIHrPlFiE1K9RoA/mcp"
    }
  }
}

Step 01

Open Cline MCP Settings

Click the Connectors icon in the Cline sidebar panel
Step 02

Add remote server

Click "Add Connector" and paste the configuration above
Step 03

Enable the server

Toggle the server switch to ON
Step 04

Start using JSONPlaceholder

Ask Cline: "Using JSONPlaceholder, help me...". 21 tools available

Claude Code · Terminal command

Official guide ↗

Advanced setup

claude mcp add jsonplaceholder --transport http "https://edge.vinkius.com/vk_preview_ohXeJdyomPPxcuW3YXJrFT1qXBIHrPlFiE1K9RoA/mcp"

Step 01

Install Claude Code

Run npm install -g @anthropic-ai/claude-code if not already installed
Step 02

Add the Connector

Run the command above in your terminal
Step 03

Verify the connection

Run claude mcp to list connected servers, or type /mcp inside a session
Step 04

Start using JSONPlaceholder

Ask Claude: "Using JSONPlaceholder, show me...". 21 tools are ready

Where the request belongs

Work JSONPlaceholder can move forward.

Built around the request

Developers who need to test API logic without a backend, AI researchers building agentic workflows, and product designers who need to demo data-driven features.

01

Backend Developer

Testing how an agent handles 200 vs 404 status codes and nested JSON responses.

02

AI Researcher

Verifying that an agent can follow multi-step instructions to update a mock todo list.

03

Product Designer

Showing a prototype of a social feed using realistic but safe mock data.

Build the capability set

Each Connector adds new actions and data without changing how you work.

Browse Connectors

01 23 capabilities

GoRest

Access and manage RESTful data for users, posts, and comments via the GoRest API. perfect for testing, prototyping, and data simulation.

02 61 capabilities

DummyJSON

Access a comprehensive suite of dummy data for testing and prototyping. products, carts, and user authentication directly from your AI agent.

03 25 capabilities

Reqres

Test your front-end against a real API. manage users, resources, and project records for prototyping and testing.

04 9 capabilities

Postman

Design, test, and document APIs collaboratively with the world most popular API development platform used by millions of developers.

05 11 capabilities

Sanity

Manage headless CMS content via Sanity. query documents with GROQ, create/update/delete content and manage datasets from any AI agent.

06 1 capability

Random User Generator

Generate high-quality random user data for testing and prototyping. names, emails, and profile photos directly via AI.

Bring your own AI

Change the model, client or framework. Keep JSONPlaceholder connected.

Before you connect

Questions about JSONPlaceholder.

The practical details behind the request, access and result.

Can I use JSONPlaceholder MCP to test my agent's API logic?

Yes, it is perfect for testing how your agent handles standard REST actions like GET, POST, and DELETE without needing a real backend.

Does JSONPlaceholder MCP require a real API key?

No, it is a public mock service. You can use a placeholder string if your agent asks for one during the setup.

How does JSONPlaceholder MCP handle nested data like photos?

It supports nested structures, allowing your agent to fetch photos associated with specific albums or comments linked to posts.

Can I use JSONPlaceholder MCP for production apps?

No, this is strictly for testing and prototyping. It provides mock data that is not intended for persistent use in a live production environment.

How does JSONPlaceholder MCP help with prototyping?

It lets you build data-driven workflows immediately. You can demo features like social feeds or task lists using realistic mock data.

Can JSONPlaceholder MCP simulate social media interactions?

Yes, you can use it to simulate creating posts, reading comments, and managing user profiles to test social-style agent behaviors.

Can I filter posts by a specific user?

Yes! Use the list_posts capability with the userId parameter to retrieve only the posts created by that specific user ID.

Does creating or updating a post actually save the data?

No. JSONPlaceholder is a fake API. Capabilities like create_post, update_post, and delete_post simulate the response as if the action succeeded, but the server state remains unchanged.

How do I find comments for a specific post?

Use the list_comments capability and provide the postId. This will return all comments associated with that specific post ID.

One connection away

Give your agent a direct line to JSONPlaceholder.

Connect JSONPlaceholder once. Keep it beside 5,900+ managed Connectors when the next task needs more.

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