Feature

Multiple Output Formats

JSON, XML, CSV, and other selectable representations.

27 providers 191 APIs 13 declared variants

The API can return more than one representation — commonly JSON plus XML, CSV, GeoJSON, or Parquet — via content negotiation or a format parameter. Saves integrators a transformation step.

27 API providers on the APIs.io network offer multiple output formats. The highest-rated are Bright Data, Onfleet, reducto-ai, positionstack, Mockaroo.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 5 Complete, well-documented, and agent-ready
Bright Data Bright Data is an Israeli web data platform and operator of the world's largest legitimate residential prox... 17 APIs 69.0 Onfleet Onfleet is an AI-powered last-mile delivery management platform that orchestrates fleet operations, dispatc... 9 APIs 68.3 reducto-ai Reducto is an AI document-parsing platform that turns unstructured PDFs, images, spreadsheets, slides, and ... 10 APIs 67.1 positionstack Forward and Reverse Batch Geocoding REST API by positionstack (an apilayer product, owned by Idera, Inc.). ... 3 APIs 67.0 Mockaroo Mockaroo is a realistic mock data generator and API mocking service used by developers and QA teams to prod... 4 APIs 66.3
Strong 5 Solid coverage with minor gaps
Amazon Kinesis Data Firehose Amazon Kinesis Data Firehose is the easiest way to reliably load streaming data into data lakes, data store... 1 API 65.2 Soracom Soracom is a global IoT cellular connectivity and platform provider headquartered in Tokyo, founded in 2014... 45 APIs 63.9 LALAL.AI LALAL.AI is an AI-powered audio separation and voice technology platform operated by OmniSale GmbH. It uses... 4 APIs 61.4 Workday Report Writer APIs for Workday Report Writer - a tool for creating custom reports and data extracts from Workday HCM and ... 9 APIs 59.5 Holiday API Holiday API is a commercial reference-data service that delivers verified public holidays, observances, cou... 4 APIs 59.1
Developing 9 Usable, with meaningful gaps to close
APIs.guru APIs.guru is an open source, community-driven directory of public REST API definitions in OpenAPI 2.0/3.x f... 1 API 49.4 Weather.gov Weather.gov is the official website of the National Weather Service (NWS), operated by NOAA within the US D... 13 APIs 48.6 Wolfram|Alpha Wolfram|Alpha is a computational knowledge engine that provides answers to natural language queries using a... 2 APIs 47.8 Apache HttpComponents Apache HttpComponents is a set of Java HTTP components, including a feature-rich HTTP client (HttpClient 5.... 3 APIs 47.3 Agricultural Statistics Service The National Agricultural Statistics Service (NASS) is an agency of the United States Department of Agricul... 5 APIs 45.9 Frankfurter Frankfurter is an open-source (MIT) currency exchange rates API that blends foreign-exchange reference rate... 6 APIs 43.9 Nominatim Nominatim is an open-source (BSD-2-Clause) search engine for OpenStreetMap data, supporting forward geocodi... 7 APIs 43.4 NOAA — National Oceanic and Atmospheric Administration The National Oceanic and Atmospheric Administration (NOAA) is the United States scientific and regulatory a... 24 APIs 43.1 Radio Browser Radio Browser is a free, community-driven directory of internet radio stations. The project publishes a pub... 4 APIs 43.1
Thin 6 Limited public surface area
Wolfram|Alpha Wolfram|Alpha is a computational knowledge engine that provides answers to natural language queries using a... 1 API 41.9 U.S. Treasury Fiscal Data The U.S. Treasury Bureau of the Fiscal Service manages the government's finances including collecting reven... 4 APIs 37.4 Arrow Electronics Arrow Electronics is a global provider of products, services, and solutions to industrial and commercial us... 2 APIs 35.1 Random User Generator Free random user data API for generating realistic fake user profiles with names, addresses, photos, and co... 1 API 34.2 Allianz Allianz is one of the world's largest insurance and financial services companies, serving over 86 million c... 6 APIs 33.5 Vegeta Vegeta is an open source HTTP load testing tool and library written in Go for generating constant request r... 1 API 32.6
Emerging 2 Early or largely undocumented
Cataas Cataas (Cat as a Service) is a free, open-source REST API that returns random cat images and GIFs with opti... 4 APIs 26.7 Azure CLI Azure CLI is the official cross-platform command-line tool for managing Microsoft Azure resources and servi... 1 API 22.5

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

24-character URL-safe resource IDs; GeoJSON [longitude, latitude] coordinates; Unix-millisecond timestamps; E.164 phone numbersContent NegotiationDirect billing endpoints (/v1/bills) with daily and monthly granularity and CSV exportFormat ConversionGeoJSON, JSON-LD, CAP, ATOM, and DWML response formats via content negotiation on NWS APIJSON, NDJSON, CSV, XLSX, and Parquet output formatsMulti-Format OutputMulti-Format SupportMulti-format outputMultiple Output FormatsMultiple Response FormatsOutput formats MP3, WAV, FLAC, AAC, OGG (defaults to source format)Table output formats — HTML, JSON, Markdown, CSV, and AI-JSON

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