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OpenAPI Specification
openapi: 3.2.0
info:
title: WeChat Mini Program Server API (subset) Access Token Login API
description: 'Subset OpenAPI description for the WeChat (Weixin) Mini Programs server-side
API hosted at `api.weixin.qq.com`. Covers the foundational endpoints needed
to bootstrap a Mini Program backend: exchanging a temporary login code for
a session via `auth.code2Session`, minting an application access token via
`auth.getAccessToken`, and retrieving a paid-only UnionID via
`auth.getPaidUnionId`.
Authentication for these foundational endpoints is keyed on the Mini
Program''s AppID and AppSecret, passed as query parameters. Subsequent
business APIs (template messages, content moderation, analytics, QR codes,
logistics, etc.) require the `access_token` obtained from
`auth.getAccessToken`.
'
version: 1.0.0
contact:
name: WeChat Developer Community
url: https://developers.weixin.qq.com/community/
license:
name: Proprietary
servers:
- url: https://api.weixin.qq.com
description: WeChat production API
tags:
- name: Login
description: Mini Program login and session exchange.
paths:
/sns/jscode2session:
get:
tags:
- Login
summary: auth.code2Session
description: 'Exchange a temporary login `code` returned by `wx.login()` in the Mini
Program client for a stable `openid` and `session_key`. The
`session_key` is used to decrypt encrypted user data delivered by other
Mini Program APIs.
'
operationId: code2Session
parameters:
- in: query
name: appid
required: true
schema:
type: string
description: Mini Program AppID.
- in: query
name: secret
required: true
schema:
type: string
description: Mini Program AppSecret.
- in: query
name: js_code
required: true
schema:
type: string
description: Temporary login credential `code` from `wx.login()`.
- in: query
name: grant_type
required: true
schema:
type: string
enum:
- authorization_code
description: Must be `authorization_code`.
responses:
'200':
description: Session exchange result.
content:
application/json:
schema:
oneOf:
- type: object
properties:
openid:
type: string
description: Mini Program-scoped user identifier.
session_key:
type: string
description: Session key used to decrypt encrypted payloads.
unionid:
type: string
description: WeChat Open Platform-wide UnionID (when applicable).
- $ref: '#/components/schemas/WeChatError'
components:
schemas:
WeChatError:
type: object
description: Standard WeChat API error envelope.
properties:
errcode:
type: integer
description: Numeric WeChat error code; `0` indicates success.
errmsg:
type: string
description: Human-readable error message.
externalDocs:
description: WeChat Mini Program Server API
url: https://developers.weixin.qq.com/miniprogram/en/dev/api-backend/