JSONPlaceholder MCP Server for Mastra AIGive Mastra AI instant access to 21 tools to Create Post, Delete Post, Get Album, and more
GDPR Free for SubscribersMastra AI is a TypeScript-native agent framework built for modern web stacks. Connect JSONPlaceholder through Vinkius and Mastra agents discover all tools automatically. type-safe, streaming-ready, and deployable anywhere Node.js runs.
Ask AI about this MCP Server for Mastra AI
The JSONPlaceholder MCP Server for Mastra AI is a standout in the Productivity category — giving your AI agent 21 tools to work with, ready to go from day one.
Vinkius delivers Streamable HTTP and SSE to any MCP client
Geminiimport { Agent } from "@mastra/core/agent";
import { createMCPClient } from "@mastra/mcp";
import { openai } from "@ai-sdk/openai";
async function main() {
// Your Vinkius token. get it at cloud.vinkius.com
const mcpClient = await createMCPClient({
servers: {
"jsonplaceholder": {
url: "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
},
},
});
const tools = await mcpClient.getTools();
const agent = new Agent({
name: "JSONPlaceholder Agent",
instructions:
"You help users interact with JSONPlaceholder " +
"using 21 tools.",
model: openai("gpt-4o"),
tools,
});
const result = await agent.generate(
"What can I do with JSONPlaceholder?"
);
console.log(result.text);
}
main();
* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure
About JSONPlaceholder MCP Server
Connect to JSONPlaceholder, the industry-standard fake REST API, to simulate data interactions within your AI workflows. Perfect for developers testing MCP integrations or prototyping agentic behaviors without a real backend.
Mastra's agent abstraction provides a clean separation between LLM logic and JSONPlaceholder tool infrastructure. Connect 21 tools through Vinkius and use Mastra's built-in workflow engine to chain tool calls with conditional logic, retries, and parallel execution. deployable to any Node.js host in one command.
What you can do
- Post Management — Use
list_posts,get_post,create_post,update_post,patch_post, anddelete_postto test full CRUD lifecycles. - Social Interactions — Query comments via
list_commentsandget_commentto simulate discussion threads and linking. - Media Handling — Explore
list_albums,get_album,list_photos, andget_phototo manage hierarchical media metadata. - Task Tracking — Use
list_todosto verify state-based logic and completion status in your agents. - Data Filtering — Test precise data retrieval by filtering lists by
userId,postId, oralbumIddirectly through tool parameters.
The JSONPlaceholder MCP Server exposes 21 tools through the Vinkius. Connect it to Mastra AI in under two minutes — credentials fully managed, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.
All 21 JSONPlaceholder tools available for Mastra AI
When Mastra AI connects to JSONPlaceholder through Vinkius, your AI agent gets direct access to every tool listed below — spanning rest-api, mock-data, testing, and more. Every call runs in a secure, isolated environment with full audit visibility. Beyond a simple connection, you get real-time monitoring of agent activity, enterprise governance, and optimized token usage.
Create post on JSONPlaceholder
Create a new post
Delete post on JSONPlaceholder
Delete a post
Get album on JSONPlaceholder
Get a specific album by ID
Get album photos on JSONPlaceholder
Get photos for a specific album
Get comment on JSONPlaceholder
Get a specific comment by ID
Get photo on JSONPlaceholder
Get a specific photo by ID
Get post on JSONPlaceholder
Get a specific post by ID
Get post comments on JSONPlaceholder
Get comments for a specific post
Get todo on JSONPlaceholder
Get a specific todo by ID
Get user on JSONPlaceholder
Get a specific user by ID
Get user albums on JSONPlaceholder
Get albums for a specific user
Get user posts on JSONPlaceholder
Get posts for a specific user
Get user todos on JSONPlaceholder
Get todos for a specific user
List albums on JSONPlaceholder
Can be filtered by userId. List all albums
List comments on JSONPlaceholder
Can be filtered by postId. List all comments
List photos on JSONPlaceholder
Can be filtered by albumId. List all photos
List posts on JSONPlaceholder
Can be filtered by userId. List all posts
List todos on JSONPlaceholder
Can be filtered by userId. List all todos
List users on JSONPlaceholder
List all users
Patch post on JSONPlaceholder
Update a post (partial)
Update post on JSONPlaceholder
Update a post (replace)
Connect JSONPlaceholder to Mastra AI via MCP
Follow these steps to wire JSONPlaceholder into Mastra AI. The entire setup takes under two minutes — your credentials stay safe behind Vinkius.
Install dependencies
npm install @mastra/core @mastra/mcp @ai-sdk/openaiReplace the token
[YOUR_TOKEN_HERE] with your Vinkius tokenRun the agent
agent.ts and run with npx tsx agent.tsExplore tools
Why Use Mastra AI with the JSONPlaceholder MCP Server
Mastra AI provides unique advantages when paired with JSONPlaceholder through the Model Context Protocol.
Mastra's agent abstraction provides a clean separation between LLM logic and tool infrastructure. add JSONPlaceholder without touching business code
Built-in workflow engine chains MCP tool calls with conditional logic, retries, and parallel execution for complex automation
TypeScript-native: full type inference for every JSONPlaceholder tool response with IDE autocomplete and compile-time checks
One-command deployment to any Node.js host. Vercel, Railway, Fly.io, or your own infrastructure
JSONPlaceholder + Mastra AI Use Cases
Practical scenarios where Mastra AI combined with the JSONPlaceholder MCP Server delivers measurable value.
Automated workflows: build multi-step agents that query JSONPlaceholder, process results, and trigger downstream actions in a typed pipeline
SaaS integrations: embed JSONPlaceholder as a first-class tool in your product's AI features with Mastra's clean agent API
Background jobs: schedule Mastra agents to query JSONPlaceholder on a cron and store results in your database automatically
Multi-agent systems: create specialist agents that collaborate using JSONPlaceholder tools alongside other MCP servers
Example Prompts for JSONPlaceholder in Mastra AI
Ready-to-use prompts you can give your Mastra AI agent to start working with JSONPlaceholder immediately.
"List all posts for user 1."
"Get the details for comment ID 5."
"Create a new post for user 10 with title 'MCP Test' and body 'Testing JSONPlaceholder'."
Troubleshooting JSONPlaceholder MCP Server with Mastra AI
Common issues when connecting JSONPlaceholder to Mastra AI through Vinkius, and how to resolve them.
createMCPClient not exported
npm install @mastra/mcpJSONPlaceholder + Mastra AI FAQ
Common questions about integrating JSONPlaceholder MCP Server with Mastra AI.
How does Mastra AI connect to MCP servers?
MCPClient with the server URL and pass it to your agent. Mastra discovers all tools and makes them available with full TypeScript types.Can Mastra agents use tools from multiple servers?
Does Mastra support workflow orchestration?
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