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© 2026 — Integration TrailsContent — CC BY-NC-SA | Code — MIT LicenseVER:2026-08-27-815c939
Challenges/map-external-api-error-to-standard-jsonapi-format·DataWeave·ELEMENTARY
DataWeaveELEMENTARY

Map External API Error to Standard JSON:API Format

Learn to handle external API failures by transforming a proprietary error response into a standardized JSON:API format. You will practice extracting data from the Mule `error` object, specifically accessing the response body and HTTP headers via `error.errorMessage`, to construct a unified error structure for a System API.

#error-handling#rest-api
BY @patryk_bandurski
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DWL
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%dw 2.0
output application/json
---
payload
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The fastest way
to learn integration.

01.
Production payloads
Real CSV/JSON/XML you'll meet on day one — null fields, mixed casing, partial records.
02.
Design problems
What practitioners actually solve — null-safety, idempotency, retries, batch boundaries.
03.
Edge cases that break
Empty arrays, type coercion, deeply nested transforms, locale-specific dates.
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CHALLENGES
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MODULES
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// WHAT YOU'LL BUILDHOW IT WORKS ↓
01.
Live DataWeave editor
Real DWL 2.0 IDE with helpers, modules, syntax highlighting.
02.
Test cases run on real runner
Same Go runner used in prod. Diffs show exactly which fields fail.
03.
3 graded attempts
Submit when you're ready. Score persists. Solution unlocks after pass or last attempt.
04.
Helpers & multi-module DWL
Bring in reusable %dw modules. Import, export, compose.
05.
XP & leaderboard
Points + XP awarded per challenge. Trail progress synced.
06.
Production-style payloads
Real CSV/JSON/XML — null fields, mixed casing, partial records.