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Powerful
API Connections

Connect to other tools, sync your data, and integrate with AI using ProWorkflow Nexus API

Get your data where it needs to be...

Our market leading API is the most comprehensive Rest API on the market. Use the powerful ProWorkflow REST/MCP API to build what you need today to

  • Sync your data between applications
  • Automate workflows
  • Integrate with other tools such as CRMs and accounting platforms
  • Build your own custom apps and dashboards
  • Integrate with AI using our MCP server
  • Use our Zapier app for a simple way of integrating with ProWorkflow

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Stay in control of your data

Choose the authentication method that best suits your needs

At ProWorkflow we know that different companies have different needs when it comes to access to their data. That’s why we offer two authentication methods for our Nexus API, and both are self-serve.

  • API key: connect to your account with no restrictions. Ideal for integrations and automations.
  • OAuth 2.0: create your OAuth client yourself in Settings → Automation → OAuth Clients. No support ticket, no waiting.
  • With OAuth, each person signs in as themselves, so every request respects their role, division access and field visibility. Perfect for Claude and other AI assistants.

Read the authentication guide →

Built for developers

Standard OAuth 2.0, a clean REST API and an MCP server

Bring your favourite OAuth library and go. Everything you need to authenticate as a user is below.

  • Auth flow: OAuth 2.0 authorization code, with refresh tokens
  • Authorize: identity.proworkflow.com/auth
  • Token: identity.proworkflow.com/token
  • Token lifetime: access 5 minutes, refresh 14 days
  • Base URL: api.proworkflow.com/api/v4
  • MCP server: api.proworkflow.com/api/v4/mcp

Connect Claude in four steps: create an OAuth client (the Claude callback is prefilled), add a custom connector in Claude with the MCP URL, paste your Client ID and Secret, then sign in.

Explore the API docs →   Set up OAuth →

# 1. Exchange an authorization code for tokens
curl -X POST https://identity.proworkflow.com/token \
  -d grant_type=authorization_code \
  -d code=$CODE \
  -d redirect_uri=https://yourapp.com/callback \
  -d client_id=$CLIENT_ID \
  -d client_secret=$CLIENT_SECRET

# 2. Call the API as that user
curl https://api.proworkflow.com/api/v4/companies \
  -H "Authorization: Bearer $ACCESS_TOKEN"

All of your API questions: answered

An extensive library of guides for all your API needs

Try out your API calls

Built-in tools for testing your API

  • Connect to your actual data with your API key in our interactive documentation
  • Test your API calls for every endpoint with our built-in test environment in our API reference library 
  • A safe way to try your API calls without actually making changes to your data, before you’re ready to deploy to your live account

MCP server lets you connect to AI

Connect your AI tools directly to our API

ProWorkflow’s dedicated Model Context Protocol server exposes ProWorkflow resources as tools for AI assistants. 

  • Connect directly to your AI tool
  • Authenticate using API key or JWT Bearer Token
  • Review our detailed MCP guide and endpoint documentation
Learn more
Read about how ProWorkflow is enabling its customers to achieve more in their businesses with streamlined workflows

Frequently Asked
Nexus API Questions

Is this the best Project Management API in the market today?

Yes – we are confident our API is the most performant, powerful, and comprehensive API of its kind.  Our developers love working with it and we think you will too!

With the Nexus API you can connect to and update almost every aspect of ProWorkflow. Our API Reference Guide contains a comprehensive library of every available endpoint, and whether you can GET, POST, PUT, or DELETE data using an endpoint.

Yes! The ProWorkflow Nexus API is currently natively integrated with Zapier. You can also choose to build your own integration to your custom tool. 

You are in control of access to your API every step of the way. Use an API key for account-level access, or create an OAuth client for user-level access with JWT Bearer tokens that mirror each user’s permissions in ProWorkflow.

OAuth setup is self-serve: a super user goes to Settings → Automation → OAuth Clients, clicks Set up OAuth client, adds a redirect URI and copies the Client ID and Secret. It takes about two minutes and you don’t need to contact support. See the step-by-step guide or read the authentication docs.

Our detailed documentation on migrating from Classic API to Nexus API guides you through every aspect of migrating your calls from Classic to ProWorkflow Nexus.

With ProWorkflow Nexus API’s MCP server, you are able to build a connection between ProWorkflow and your AI tool of choice. Please see our MCP server guide to get started. 

Our customers use our Nexus API for everything from connecting to CRM and accounting tools, to building automations, to reviewing their data, to building custom bespoke applications. The sky is the limit! If you’re an existing client and you have questions just reach out to our support team at [email protected]; if you’re a new client please start a trial account or contact our Sales team at [email protected].

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