Feature

Multiple Output Formats

JSON, XML, CSV, and other selectable representations.

26 providers 103 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.

26 API providers on the APIs.io network offer multiple output formats. The highest-rated are Bright Data, Soracom, reducto-ai, Onfleet, Amazon Kinesis Data Firehose.

Providers

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

Strong 9 Solid coverage with minor gaps
Bright Data Bright Data is an Israeli web data platform and operator of the world's largest legitimate residential prox... 11 APIs 68.3 Soracom Soracom is a global IoT cellular connectivity and platform provider headquartered in Tokyo, founded in 2014... 18 APIs 67.5 reducto-ai Reducto is an AI document-parsing platform that turns unstructured PDFs, images, spreadsheets, slides, and ... 10 APIs 64.7 Onfleet Onfleet is an AI-powered last-mile delivery management platform that orchestrates fleet operations, dispatc... 8 APIs 64.0 Amazon Kinesis Data Firehose Amazon Kinesis Data Firehose is the easiest way to reliably load streaming data into data lakes, data store... 1 API 63.2 Mockaroo Mockaroo is a realistic mock data generator and API mocking service used by developers and QA teams to prod... 1 API 63.1 Agricultural Statistics Service The National Agricultural Statistics Service (NASS) is an agency of the United States Department of Agricul... 4 APIs 61.8 Holiday API Holiday API is a commercial reference-data service that delivers verified public holidays, observances, cou... 4 APIs 61.0 positionstack Forward and Reverse Batch Geocoding REST API by positionstack (an apilayer product, owned by Idera, Inc.). ... 1 API 60.6
Developing 8 Usable, with meaningful gaps to close
Wolfram|Alpha Wolfram|Alpha is a computational knowledge engine that provides answers to natural language queries using a... 6 APIs 59.3 Workday Report Writer APIs for Workday Report Writer - a tool for creating custom reports and data extracts from Workday HCM and ... 4 APIs 58.2 LALAL.AI LALAL.AI is an AI-powered audio separation and voice technology platform operated by OmniSale GmbH. It uses... 1 API 57.5 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 54.7 Wolfram|Alpha Wolfram|Alpha is a computational knowledge engine that provides answers to natural language queries using a... 5 APIs 54.0 U.S. Treasury Fiscal Data The U.S. Treasury Bureau of the Fiscal Service manages the government's finances including collecting reven... 1 API 52.0 Weather.gov Weather.gov is the official website of the National Weather Service (NWS), operated by NOAA within the US D... 1 API 49.5 Apache HttpComponents Apache HttpComponents is a set of Java HTTP components, including a feature-rich HTTP client (HttpClient 5.... 2 APIs 48.3
Thin 8 Limited public surface area
Allianz Allianz is one of the world's largest insurance and financial services companies, serving over 86 million c... 3 APIs 43.5 Random User Generator Free random user data API for generating realistic fake user profiles with names, addresses, photos, and co... 1 API 42.9 NOAA — National Oceanic and Atmospheric Administration The National Oceanic and Atmospheric Administration (NOAA) is the United States scientific and regulatory a... 12 APIs 42.2 Cataas Cataas (Cat as a Service) is a free, open-source REST API that returns random cat images and GIFs with opti... 1 API 41.5 Nominatim Nominatim is an open-source (BSD-2-Clause) search engine for OpenStreetMap data, supporting forward geocodi... 1 API 41.3 Frankfurter Frankfurter is an open-source (MIT) currency exchange rates API that blends foreign-exchange reference rate... 2 APIs 41.0 Vegeta Vegeta is an open source HTTP load testing tool and library written in Go for generating constant request r... 1 API 37.6 Arrow Electronics Arrow Electronics is a global provider of products, services, and solutions to industrial and commercial us... 2 APIs 31.6
Emerging 1 Early or largely undocumented
Azure CLI Azure CLI is the official cross-platform command-line tool for managing Microsoft Azure resources and servi... 1 API 23.9

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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