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NetSuite RESTlet API Specification Template

A RESTlet is only useful if the people calling it know exactly what to send and what comes back. This template documents a custom NetSuite endpoint in a form integration partners can build against: methods, parameters, payloads, authentication and error behavior.

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NetSuite RESTlet API Specification Template

Work Order Status API (v1.0)

Owner: Integration team Script ID: customscript_wo_status_rl Deployment ID: customdeploy_wo_status_rl Authentication: Token-based authentication Integration role: Integration - Shop Floor

Purpose

Lets the shop floor system read work order status and post completed quantities back to NetSuite.

Endpoints

MethodPurposeRequestSuccess response
GETRead statusQuery parameters below200 with JSON body
POSTPost completionJSON body below200 with posted record IDs
PUTNot used
DELETENot used

GET parameters

workOrderId (required, string): NetSuite internal ID or external ID of the work order. includeOperations (optional, boolean, default false).

POST body example

{ "workOrderId": "12345", "completedQuantity": 40, "scrapQuantity": 1, "completedAt": "2026-10-20T14:30:00Z" }

Error responses

400 invalid or missing parameter. 404 work order not found. 409 work order already closed. 500 unexpected error; message includes a correlation ID that matches the script log.

Limits and idempotency

One request completes one operation. Repeating the same request with the same requestId returns the first result and posts nothing new. Keep requests below the account concurrency allowance.

Approvals

API owner / Date
Consumer team lead / Date
Security reviewer / Date

Fill in the real RESTlet URL from the script deployment record, since the host and parameters are account specific. Check governance, concurrency and authentication details against NetSuite's current documentation before publishing.

Review your API design

Optional: have an expert review your endpoint contract and error handling.

Optional. The tool and every export work without this. No spam.

How to use the template

Describe the purpose in one or two sentences, then fill in the script and deployment IDs so support can find the code. Document each HTTP method you implement and mark those you do not. Provide a realistic request and response example; consumers copy examples more than they read prose. Export to PDF or Word and send it to the consuming team along with the deployment URL from the script deployment record.

  • One section per method actually implemented
  • Real example payloads, not placeholders
  • State authentication and the role the caller uses
  • List every error the caller should handle

Designing the contract

A good RESTlet contract is small and explicit. Validate required parameters, return consistent JSON including on errors, and use meaningful status codes or an error object the caller can parse. Decide whether calls are idempotent. Integrations retry after timeouts, so a POST that creates a record twice on retry will cause real data problems. A request identifier or an external ID lets the script detect repeats safely.

Common mistakes

Common issues are returning an HTML error page instead of JSON, leaking internal error text to the caller, giving the integration role broader permissions than the endpoint needs, and ignoring concurrency limits when several systems call at once. Also remember that RESTlets run with governance limits, so a call that processes an unbounded list will eventually fail. Paginate or move the work to a queue.

  • No idempotency on write operations
  • Non-JSON error responses
  • Over-permissioned integration role
  • Unbounded result sets

Frequently Asked Questions

Should I use a RESTlet or the standard REST record API?

Use the standard REST record API or SuiteQL when it already covers the need, since it needs no custom code to maintain. Use a RESTlet when you need custom logic, a combined operation or a tailored payload.

Which authentication should I document?

Document what you actually use, commonly token-based authentication or OAuth 2.0 for integrations, and the specific role. Never put keys or secrets in the specification.

How do I make a POST safe to retry?

Accept a request identifier or use an external ID, check whether it was processed, and return the original result if so. Store the identifier on the record or a custom record.

Does the spec need versioning?

Yes. Put a version in the document and in the deployment or URL parameter, and record changes so consumers know when a field was added or changed.

If you plan to expose NetSuite data to AI agents or other systems through controlled endpoints, Netray can help design and build that layer.

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