REST Client

REST Client is a Visual Studio Code extension developed by Huachao Mao that enables developers to send HTTP requests and view responses directly within the VS Code editor. It supports RFC 2616 HTTP request format using .http and .rest files, GraphQL queries, cURL commands, multiple authentication schemes (Basic, Digest, SSL Client Certificates, Azure AD, AWS Signature v4, AWS Cognito), environment and file variables, request chaining, cookie management, code generation to multiple languages, and response saving. The extension is installed via the VS Code Marketplace under the identifier humao.rest-client and is widely used as a lightweight alternative to dedicated API clients like Postman and Insomnia.

REST Client is listed with 1 API on the APIs.io network. Tagged areas include Clients, HTTP Client, IDE Extension, VS Code, and API Testing.

The REST Client catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

REST Client’s developer surface includes documentation and 12 more developer resources.

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25.8/100 emerging ▬ flat Agent 2/100 human only Heartbeat 13/100 dormant self hosted · MIT Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 API

Clients HTTP Client IDE Extension VS Code API Testing Developer Tools

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 25.8/100 · emerging

Contract Quality 5.3 / 19

Developer Ergonomics 3.2 / 15

Access Clarity 1.2 / 15

Operational Transparency 2.6 / 10

Contract Governance 2.1 / 9

Discoverability 4.3 / 8

Regulatory Posture 1.6 / 15

Open Source Surface 4.0 / 10

Agent readiness — 2/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 75 points between them, because both conditional facets apply and carry 25 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

11 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 7.9 — up to +18.4 composite points
Contract Quality scores 28.4 — up to +17.9 composite points
Developer Ergonomics scores 21.4 — up to +15.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/rest-client/apis.yml: open an issue on github.com/api-evangelist/rest-client to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
IDE Extension Marketplaces (JetBrains, VS Code, Open VSX, Docker Verified Publishers, PyPI orgs)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

REST Client

REST Client is a Visual Studio Code extension for sending HTTP requests and viewing responses directly within the editor. It supports .http and .rest file formats, GraphQL, cURL...

GraphQL 1

GraphQL schemas published by this provider.

REST Client GraphQL API

REST Client is a Visual Studio Code extension for sending HTTP requests and viewing responses directly within the editor. It supports .http and .rest file formats, GraphQL, cURL...

GRAPHQL

REST Client API pricing

Not yet checked against REST Client's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against REST Client's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Rest Client Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rest Client Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Rest Client Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Rest Client Context

8 classes · 13 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

REST Client — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

REST Client HTTP Request

9 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Rest Client Request Structure

0 properties

JSON STRUCTURE

Examples 2

Example request and response payloads for these APIs.

Rest Client Get Request Example

5 fields

EXAMPLE

Rest Client Request Chaining Example

4 fields

EXAMPLE

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Rest Client Domain Security

TLSv1.3

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

JSONLDContext

JSONLDContext

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

IssueTracker

IssueTracker

Releases

Releases

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: rest-client
name: REST Client
description: REST Client is a Visual Studio Code extension developed by Huachao Mao that enables developers to send HTTP requests
  and view responses directly within the VS Code editor. It supports RFC 2616 HTTP request format using .http and .rest files,
  GraphQL queries, cURL commands, multiple authentication schemes (Basic, Digest, SSL Client Certificates, Azure AD, AWS Signature
  v4, AWS Cognito), environment and file variables, request chaining, cookie management, code generation to multiple languages,
  and response saving. The extension is installed via the VS Code Marketplace under the identifier humao.rest-client and is
  widely used as a lightweight alternative to dedicated API clients like Postman and Insomnia.
type: Index
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/rest-client.png
tags:
- Clients
- HTTP Client
- IDE Extension
- VS Code
- API Testing
- Developer Tools
url: https://raw.githubusercontent.com/api-evangelist/rest-client/refs/heads/main/apis.yml
created: '2026-03-27'
modified: '2026-05-02'
specificationVersion: '0.23'
apis:
- aid: rest-client:rest-client
  name: REST Client
  description: REST Client is a Visual Studio Code extension for sending HTTP requests and viewing responses directly within
    the editor. It supports .http and .rest file formats, GraphQL, cURL, multiple auth schemes, environment variables, request
    chaining, and code generation.
  humanURL: https://marketplace.visualstudio.com/items?itemName=humao.rest-client
  tags:
  - Clients
  - HTTP Client
  - IDE Extension
  - VS Code
  - API Testing
  - GraphQL
  - CURL
  tags_raw:
  - Clients
  - HTTP Client
  - IDE Extension
  - VS Code
  - API Testing
  - GraphQL
  - cURL
  properties:
  - type: Documentation
    url: https://github.com/Huachao/vscode-restclient#readme
  - type: GettingStarted
    url: https://github.com/Huachao/vscode-restclient#usage
  - type: GitHubRepository
    url: https://github.com/Huachao/vscode-restclient
  - type: VS Code Marketplace
    url: https://marketplace.visualstudio.com/items?itemName=humao.rest-client
  - type: ChangeLog
    url: https://github.com/Huachao/vscode-restclient/blob/master/CHANGELOG.md
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/rest-client/refs/heads/main/json-schema/rest-client-request-schema.json
  - type: JSONStructure
    url: https://raw.githubusercontent.com/api-evangelist/rest-client/refs/heads/main/json-structure/rest-client-request-structure.json
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/rest-client/refs/heads/main/examples/rest-client-get-request-example.json
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/rest-client/refs/heads/main/examples/rest-client-request-chaining-example.json
  - url: graphql/rest-client-graphql.md
    type: GraphQL
common:
- type: Plans
  url: plans/rest-client-plans-pricing.yml
- type: RateLimits
  url: rate-limits/rest-client-rate-limits.yml
- type: FinOps
  url: finops/rest-client-finops.yml
- type: IssueTracker
  url: https://github.com/Huachao/vscode-restclient/issues
- type: Releases
  url: https://github.com/Huachao/vscode-restclient/releases
- type: CodeOfConduct
  url: https://github.com/Huachao/vscode-restclient/blob/master/CODE_OF_CONDUCT.md
- type: License
  name: MIT
  url: https://github.com/Huachao/vscode-restclient/blob/master/LICENSE
- type: DomainSecurity
  url: security/rest-client-domain-security.yml
- type: Website
  url: https://marketplace.visualstudio.com/items?itemName=humao.rest-client
- type: Documentation
  url: https://github.com/Huachao/vscode-restclient#readme
- type: GitHubOrganization
  url: https://github.com/Huachao/vscode-restclient
- type: Vocabulary
  url: https://raw.githubusercontent.com/api-evangelist/rest-client/refs/heads/main/vocabulary/rest-client-vocabulary.yml
- type: JSONLDContext
  url: https://raw.githubusercontent.com/api-evangelist/rest-client/refs/heads/main/json-ld/rest-client-context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: vs-code-marketplace
x-relationship: product

REST Client API — frequently asked questions

Does REST Client have an API?

Yes. APIs.io lists 1 API from REST Client, including REST Client.

How much does the REST Client API cost?

APIs.io lists 3 pricing plans for REST Client, with each plan's price, limits and inclusions under Pricing on this page.

Is the REST Client API ready for AI agents?

REST Client has a Kin Score of 25.8 out of 100 (emerging) and an Agent Readiness score of 1.9 (human-only), scored by API Evangelist on 2026-11-06.

Work with this as data

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get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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