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feat(api): add clerk api --fapi for the public Frontend API#345

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feat/api-fapi-passthrough
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feat(api): add clerk api --fapi for the public Frontend API#345
rafa-thayto wants to merge 3 commits into
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feat/api-fapi-passthrough

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@rafa-thayto

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Summary

clerk api spoke only BAPI (default) and PLAPI (--platform). After a config change, the natural way to verify it took effect is the instance's public FAPI /v1/environment payload (what clerk-js actually consumes) — but that meant dropping to curl plus decoding the FAPI domain out of the publishable key by hand.

This adds --fapi:

clerk api --fapi /environment --app <id> --instance dev
  • Resolves the FAPI host from the instance's publishable key (looked up via --app/--instance or the linked project through the Platform API), reusing the existing lib/fapi.ts client and decodePublishableKey.
  • The request itself is unauthenticated — these endpoints are public.
  • Paths are /v1-normalized like the other modes, so both /environment and /v1/environment work.
  • --fapi and --platform are mutually exclusive.

Implementation reuses the request-target resolution: api() now builds a { baseUrl, runRequest } pair, which also de-duplicates the BAPI/PLAPI branches. The local error handler was broadened from BapiError to ApiError so FAPI error bodies still print to stdout for piping.

Test plan

  • New tests in src/commands/api/index.test.ts: host resolution + no auth header; --fapi/--platform conflict; FAPI error body printed to stdout with exit 1
  • Full api + completion + api-queries integration suites pass

Closes #332

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changeset-bot Bot commented Jun 16, 2026

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🦋 Changeset detected

Latest commit: e1b5db3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
Name Type
clerk Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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Reviewing files that changed from the base of the PR and between 4240dd5 and 64f6f75.

📒 Files selected for processing (6)
  • .changeset/api-fapi-passthrough.md
  • packages/cli-core/src/commands/api/README.md
  • packages/cli-core/src/commands/api/fapi.ts
  • packages/cli-core/src/commands/api/index.test.ts
  • packages/cli-core/src/commands/api/index.ts
  • packages/cli-core/src/lib/fapi.ts

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@wyattjoh wyattjoh left a comment

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Clean, well-scoped addition that mirrors the existing BAPI/PLAPI passthrough patterns. A few follow-ups around dry-run semantics, a duplicated version constant, and silently-ignored flags.

Comment thread packages/cli-core/src/commands/api/index.ts Outdated
Comment thread packages/cli-core/src/commands/api/fapi.ts
Comment thread packages/cli-core/src/commands/api/fapi.ts
Comment thread packages/cli-core/src/commands/api/index.ts
Comment thread packages/cli-core/src/commands/api/index.test.ts
clerk api spoke only BAPI and PLAPI, so verifying a config change against the
instance's public FAPI /v1/environment (what clerk-js consumes) meant dropping
to curl and decoding the FAPI domain out of the publishable key by hand.

Add --fapi: resolve the FAPI host from the instance's publishable key (via
--app/--instance or the linked project) and do an unauthenticated passthrough,
reusing the existing lib/fapi.ts client. --fapi and --platform are mutually
exclusive.

Closes #332
- Move dry-run check before resolveFapiHost so --fapi --dry-run avoids
  the Platform API round-trip; shows <fapi-host> placeholder instead
- Import CLERK_JS_API_VERSION from lib/fapi.ts instead of redeclaring it
- Warn when --secret-key is provided with --fapi (key is ignored)
- Add tests: --fapi no-app NOT_LINKED error, /environment and
  /v1/environment path normalization, --secret-key warning, --dry-run
  no network call
@rafa-thayto rafa-thayto force-pushed the feat/api-fapi-passthrough branch from 8f9d521 to 64f6f75 Compare June 18, 2026 12:19
@rafa-thayto rafa-thayto requested a review from wyattjoh June 18, 2026 12:19
Comment thread packages/cli-core/src/lib/fapi.ts Outdated
Comment thread packages/cli-core/src/commands/api/index.ts Outdated

@dmoerner dmoerner left a comment

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I think we should just be clearer that this only hits public endpoints.

Because it is possible to use the command line to hit FAPI with curl, and use auth, you just need to use a cookie jar. This is how I do it in my local skill for testing:

FAPI=""
jar=$(mktemp)

# 1. Create a dev browser; capture its token.
tok=$(curl -s -c "$jar" -X POST "$FAPI/v1/dev_browser" -H "Origin: $FAPI" | jq -r '.token')

# 2. Inspect what the instance has enabled (strategies, factors).
curl -s -b "$jar" -c "$jar" "$FAPI/v1/environment?__clerk_db_jwt=$tok" -H "Origin: $FAPI" \
  | jq '.auth_config | {first_factors, identification_strategies, password}'

# 3. The client state (sessions, sign_in, sign_up).
curl -s -b "$jar" -c "$jar" "$FAPI/v1/client?__clerk_db_jwt=$tok" -H "Origin: $FAPI" \
  | jq '.response | {sessions: (.sessions|length)}'

- Refactor fallback branch of resolveInstance to use
  resolveFetchedApplicationInstance instead of hand-rolling
  app.instances.find (addresses wyattjoh comment 3)
- Bump CLERK_JS_API_VERSION from "5" to "6" to match current clerk-js
  major (addresses dmoerner comment 6)
- Clarify --fapi help text: "unauthenticated endpoints only" instead of
  "no auth" to avoid implying it skips auth on authenticated endpoints
  (addresses dmoerner comment 7)
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Feature: fetch an instance's public FAPI /v1/environment for config verification

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