AdminConsole
Tutorials/Beginner
Beginner25 minREST

Build a server-side geocoding boundary

Resolve addresses on a trusted server, retain provider identity, and return a narrow application contract.

By the endA credential-safe geocoding service with typed errors and provenance.
Real-world scenario

Build against an explicit contract

A backend must convert submitted addresses to candidates while keeping Mappls credentials and provider response complexity away from clients.

A Mappls developer projectA restricted REST applicationFixture data with no production credentialsA request, aggregate, or correlation ID strategy
Step 1

Define the user and system contract

A backend must convert submitted addresses to candidates while keeping Mappls credentials and provider response complexity away from clients. Record the region, data freshness, latency budget, privacy purpose, credential owner, and fallback before choosing an SDK or endpoint.

Step 2

Define a narrow request contract

Accept bounded address text plus explicit region/bias fields, attach an application request ID, and reject markup or oversized input before the provider call.

Search & Places · SDK or product slice
import { createMapplsClientFromEnvironment } from "@mappls/server-sdk";

// MAPPLS_STATIC_KEY is applied using the current documented query contract.
// Keep the restricted key inside this trusted server process.
const mappls = createMapplsClientFromEnvironment();
const suggestions = await mappls.autosuggest({
  query: "coffee",
  region: "IND"
});
Step 3

Call through the trusted adapter

Acquire a bearer token, encode query parameters, cap timeout/body size, retain provider request identity, and return typed unavailable, denied, empty, or ambiguous outcomes.

Step 4

Return candidates, not false certainty

Expose normalized label, Mappls Pin, coordinates, confidence/context available from the source, and require the caller to choose when multiple candidates remain.

Step 5

Prove the production behavior

Automate the happy path and every named failure. The release is ready only when credentials appear only in bearer headers; ambiguous results stay explicit; provider identity follows the selected candidate. Capture provider request identity without logging credentials or unnecessary precise location.

Recovery design

Failure modes you must exercise

invalid address input

Fail fast with a typed, user-safe outcome and preserve the original request identity.

no candidate or multiple candidates

Keep the last verified state, mark freshness honestly, and retry only within the documented idempotency boundary.

token, quota, or provider timeout

Reconcile durable local and provider evidence before declaring success or issuing a compensating command.

Never turn uncertainty into success

Timeout after a stateful command is an unknown outcome. Query by provider/idempotency identity or wait for authoritative events; do not blindly retry a new command.

Acceptance criteria

Definition of done

credentials appear only in bearer headersambiguous results stay explicitprovider identity follows the selected candidate

REST production checks

Credentials never reach a browser or mobile bundleTimeout, retry, and idempotency policies are explicitCoordinates, addresses, and identifiers have data-retention rulesEvery operation is attributable in logs and usage reporting
Grounded implementation

Continue from source, contracts, and a full app

These links resolve to repository-derived evidence; unsupported package names and endpoints are not filled in from guesswork.

Study the complete Consented address verification state machine
Tutorial complete

Run it, break it, then observe it

Start with fixture credentials, execute the failure plan, and use request logs, usage, webhook evidence, and operational metrics before promoting traffic.