How AI is applied across API Evangelist and APIs.io. Read my AI disclosure →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

Need help?

Contact us
launchdarkly

launchdarkly Client-Side Evaluation API

Flag evaluation endpoints for client-side and mobile SDKs using environment IDs or mobile keys for authentication.

Documentation Provider Profile APIs.io OpenAPI GitHub

launchdarkly Client-Side Evaluation API is one of 27 APIs that launchdarkly publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Client-Side Evaluation. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

This API exposes 1 operation across 1 path, and defines 2 schemas. It is described by OpenAPI 3.1.0, at version 8.0.

Requests are made against a single base URL, http://localhost:8030.

1 operations 1 paths 2 schemas 1 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
8.0
Base URL
https://app.launchdarkly.com/api/v2
Authentication
API Key, API Key
Contact
LaunchDarkly Support
License
Apache 2.0
Resource Areas
1

Authentication & Security 2

launchdarkly Client-Side Evaluation API declares 2 security schemes for authenticating requests. An API key is passed in the header as Authorization (sdkKeyAuth). An API key is passed in the header as Authorization (mobileKeyAuth).

  • sdkKeyAuth — Server-side SDK key for authenticating with the Relay Proxy.
  • mobileKeyAuth — Mobile SDK key for authenticating with the Relay Proxy.

Paths & Operations 1

Across 1 path, the API surfaces 1 operation — 1 GET. Each is listed below with its method, path, parameters, and response codes.

Client-Side Evaluation 1

Flag evaluation endpoints for client-side and mobile SDKs using environment IDs or mobile keys for authentication.

GET
/sdk/evalx/{envId}/contexts/{contextBase64}
Evaluate all flags for a client-side context (GET)
evaluateAllFlagsClientSide 2 params → 200401503

Schemas 2

The contract defines 2 schemas that model the data the API accepts and returns. The most detailed is FlagEvaluation (6 properties). Each schema is shown below with its type and property counts.

FlagEvaluations
object
A map of flag keys to their evaluated results for a context.
FlagEvaluation
object
The evaluated result of a single feature flag.
6 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

launchdarkly-client-side-evaluation-api-openapi.yml Raw ↑

Other APIs launchdarkly publishes across the network.

LaunchDarkly Webhooks API
AE Profile APIs.io
launchdarkly Access Tokens API
AE Profile APIs.io
launchdarkly Account Members API
AE Profile APIs.io
launchdarkly Approvals API
AE Profile APIs.io
launchdarkly Audit Log API
AE Profile APIs.io
launchdarkly Client-Side Streaming API
AE Profile APIs.io
launchdarkly Code References API
AE Profile APIs.io
launchdarkly Custom Roles API
AE Profile APIs.io
launchdarkly Environments API
AE Profile APIs.io
launchdarkly Experiments API
AE Profile APIs.io
launchdarkly Feature Flags API
AE Profile APIs.io
launchdarkly Flag Triggers API
AE Profile APIs.io
#Client-Side Evaluation
← Back to L APIs
API Details
ID
launchdarkly:launchdarkly-client-side-evaluation-api
Base URL
https://app.launchdarkly.com/api/v2
Docs
https://apidocs.launchdarkly.com/
Provider
launchdarkly
APIs.io →  GitHub →
Explore more
All APIs Providers APIs.io Network
Work with this as data

Every API here is available over the API and to AI agents over MCP. APIs is not yet its own endpoint on the v1 API. Reach this content through network search and the tag graph, or the MCP server below.

Installs https://mcp.apievangelist.com/mcp in Claude, Cursor, VS Code and the rest — one button, every client.

MCP tools for apis
4 tools reach this content
  • search_api_evangelistSearch every content type across the network at once.
  • find_relatedThe shared-tag relevance graph — what else covers this.
  • get_tagEverything one tag labels, across all content types.
  • guide_topicPRO — a curated bundle for a topic: area, guidance, rules, papers, stories, services.
All tools & prompts
Call it yourself
curl for this page
Search the network for this 
curl "https://api.apievangelist.com/v1/search?q=launchdarkly-client-side-evaluation-api&limit=10"
Everything under a tag 
curl "https://api.apievangelist.com/v1/tags/launchdarkly-client-side-evaluation-api"

Discovery needs no key. Full bodies and the synthesis endpoints are Pro.

Get an API key

Free tier, no email required. Sign in with whichever identity you already have.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have. Your account

Where this information came from

This is an independent, third-party profile of launchdarkly Client-Side Evaluation API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.