Booking System With REST API
Accepts booking requests via REST API, validates against business hours and conflicts.
What it does
You can schedule appointments by sending a simple request to the REST API, which instantly checks your availability against business hours and existing calendar conflicts before adding confirmed events with Meet links directly to your Google Calendar.
Step by step
- Configure the HTTP Trigger in n8n to accept POST requests for booking and GET requests for availability checks.
- Set up the Google Calendar node with OAuth2 authentication to access the user's calendar resources.
- Define the JSON schema for the input payload, ensuring required fields like date, time, and duration are present.
Where the LLM does the work
- Generate the JavaScript logic in the Code node to parse incoming ISO 8601 timestamps and convert them to the specific timezone format expected by Google Calendar.
- Write the conditional branching logic that distinguishes between a simple availability query and a full booking creation request based on the endpoint path or payload type.
- Craft the error handling messages to provide user-friendly feedback when inputs fail validation, such as invalid date formats or missing required fields.
Watch out for
Timezone mismatches can cause events to appear at wrong times so always explicitly define the timezone in both the input parsing and calendar creation steps.
Double-booking conflicts occur if availability checks are not atomic so use the Google Calendar check node immediately before creating the event within the same workflow execution.
Meet link generation requires specific calendar settings enabled in your Google Workspace account verify this configuration beforehand to avoid missing video conferencing details.
Tools that fit
Code LLM Input validation and business logic processing
The agent brief
Everything your agent needs, including the gotchas. Copy it and go.
You are helping me build the following AI agent workflow. ## Goal Booking System With REST API: Accepts booking requests via REST API, validates against business hours and conflicts. ## Specification - What it does: You can schedule appointments by sending a simple request to the REST API, which instantly checks your availability against business hours and existing calendar conflicts before adding confirmed events with Meet links directly to your Google Calendar. - Trigger: Triggered by an event (Event · on webhook call) - Autonomy: Fully hands-off - Expected setup effort: under an hour - Tools/services involved: - n8n: Workflow orchestration and API hosting - Google Calendar: Scheduling, conflict detection, and event creation - Code: Input validation and business logic processing ## Known pitfalls, handle each one explicitly in your implementation 1. Timezone mismatches can cause events to appear at wrong times so always explicitly define the timezone in both the input parsing and calendar creation steps. 2. Double-booking conflicts occur if availability checks are not atomic so use the Google Calendar check node immediately before creating the event within the same workflow execution. 3. Meet link generation requires specific calendar settings enabled in your Google Workspace account verify this configuration beforehand to avoid missing video conferencing details. ## Reference implementation https://n8n.io/workflows/8635 (workflow template) Fetch and inspect this before building. If it matches my stack, adapt it; if not, rebuild the pattern with my tools. ## Process requirements 1. Before building: ask me which of the listed tools I actually use and what my platform is (n8n / Make / code / other). Do not assume. 2. Adapt the pattern to my answers; do not force the reference stack. 3. Address every pitfall above; tell me how you handled each. 4. Provide a test plan I can run before letting this touch real data. 5. Ask before any step that sends messages, modifies data, or spends money. Source: https://usecasesforagents.com/use-case/smart-booking-system-with-rest-api/ via usecasesforagents.com
Frequently asked questions
Can I use a different Automation Platform than n8n?
Yes. n8n is only the example automation platform in this recipe. The same flow works with Home Assistant. Swap the automation platform connection and keep the rest of the setup as written.
Want this running in your business?
This is what I do. I design and build AI agents like this one, and keep them running. If you want it set up for your team instead of doing it yourself, get in touch.
Who it's for
Built for developers who want the busywork around code automated, not the code itself.
Ops-IT teams triaging their own internal requests get the same pattern, different queue.
Freelancers and consultants can run this per-client with no changes beyond the source data.