Serper Autocomplete API

openapi: 3.0.3
info:
  title: Serper Google Search Autocomplete API
  description: RESTful API providing real-time Google Search Engine Results Page (SERP) data in structured JSON format. Supports web search, image search, news, maps, places, videos, shopping, scholar, patents, and autocomplete via POST endpoints. Authentication uses an X-API-KEY header. Designed for high-throughput AI and LLM applications with up to 300 queries per second.
  version: 1.0.0
  contact:
    name: Serper Support
    url: https://serper.dev
  termsOfService: https://serper.dev/terms-of-service
  license:
    name: Commercial
    url: https://serper.dev
servers:
- url: https://google.serper.dev
  description: Serper API server
security:
- apiKeyHeader: []
tags:
- name: Autocomplete
  description: Search autocomplete suggestions
paths:
  /autocomplete:
    post:
      operationId: autocomplete
      summary: Autocomplete
      description: Retrieve Google search autocomplete suggestions for a given query string. Returns an ordered list of suggested search queries.
      tags:
      - Autocomplete
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AutocompleteRequest'
            example:
              q: how to build
              gl: us
              hl: en
      responses:
        '200':
          description: Successful autocomplete response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AutocompleteResponse'
              example:
                suggestions:
                - value: how to build your own house
                - value: how to build your own pc
                - value: how to build your own website
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
components:
  schemas:
    AutocompleteSuggestion:
      type: object
      properties:
        value:
          type: string
          description: Autocomplete suggestion text.
    AutocompleteResponse:
      type: object
      properties:
        suggestions:
          type: array
          description: List of autocomplete suggestions.
          items:
            $ref: '#/components/schemas/AutocompleteSuggestion'
    ErrorResponse:
      type: object
      properties:
        message:
          type: string
          description: Human-readable error description.
    AutocompleteRequest:
      type: object
      required:
      - q
      properties:
        q:
          type: string
          description: The partial search query for autocomplete suggestions.
          example: how to build
        gl:
          type: string
          description: Country code for geolocation (ISO 3166-1 alpha-2).
          example: us
          default: us
        hl:
          type: string
          description: Language code for results (ISO 639-1).
          example: en
          default: en
  responses:
    Unauthorized:
      description: Unauthorized — invalid or missing API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    BadRequest:
      description: Bad request — missing or invalid parameters.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    TooManyRequests:
      description: Too many requests — rate limit exceeded or credits exhausted.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    apiKeyHeader:
      type: apiKey
      in: header
      name: X-API-KEY
      description: API key obtained from https://serper.dev/api-key