Testing Streams Just Got Easier

Testing for streaming APIs, right at your desktop.

Your one-stop shop for sending, monitoring, and testing RESTful, gRPC, GraphQL, Websocket, OpenAPI, WebRTC, and streaming API requests. Now supporting Webhooks and featuring Dark Mode.

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swell dashboard

All the protocols you'll ever need.

Multiple streams. A single connection.

HTTP/2

Swell supports full HTTP2 multiplexing of requests and responses. HTTP requests to the same host will be sent over the same connection. Swell will attempt to initiate an HTTP2 connection for all HTTPS requests by default, but will revert to HTTP1.1 for legacy servers. Multiple concurrent streams are allowed for each connection.

Stay connected.

Server-sent Events (SSEs)

Initiated by a simple toggle box, Swell displays SSE events one by one as they come in. Similar to HTTP/2 streams, multiple open connection streams are allowed for SSE.

Keeping in touch

Web Sockets

Swell enables connecting directly to WebSocket servers with an HTTP handshake. Developers can directly send data to the connected WS server in the form of simple strings or binary data. Messages and images are displayed in chatbox format, clearly indicating outgoing and incoming messages.

Queries, Mutations, Subscriptions

GraphQL

Swell includes full support for all three root types of GraphQL — queries, mutations, and subscriptions as well as Introspection - with and without variables. Smart code editor allows for easy query creation.

Bring Your Own Proto (BYOP)

gRPC

Swell includes full support for all four streaming types of gRPC - unary, client stream, server stream, bidirectional stream.

Built In Test Suite Editor

Testing

Compose test suites in JavaScript with built in Chai-style TDD/BDD assertion syntax. Tests will resolve on response data and all results will appear in the new Test Response pane.

Advanced Testing Capabilities

WebSockets

Connect to a Websocket server and test with a variety of data types: binary data (i.e. Binary Large oBjects or array buffers) and strings. Conveniently write mocha/chai assertion tests on data transfers. Further, export data logs as well as measure client/server latency.

ICE, ICE Baby

WebRTC and OpenAPI 3.1

Make API requests based on a range of provided options that are generated according to specifications defined in a yaml or json-formatted OpenAPI document. Plus, test WebRTC signaling by verifying ICE candidates and generating an SDP.

Additional Testing Capability

WebHook Testing

Swell includes user-defined HTTP callback connection testing designed to test other server's connection to the web and ability to send data. The test insures that when an event occurs, the source site makes an HTTP request to the URL configured for the webhook.

Now Featuring:

Dark Mode

Additionally, Swell v1.0.0 now features a toggle to activate Dark mode. Now users can personalize their layout to enhance their endpoint testing experience.

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Get Swell desktop app

The desktop distribution is suggested for Linux, Mac, and Windows users.

Contributors

Christopher Pan

@ChristopherJPan

Michael Prince

@MichaelGPrince

Adrian Uesugui

@auesugui

Jacob Viesselman

@JacobViesselman

Jennifer Wu

@jsh-wu

Ted Craig

@tedcraig

Anthony Wong

@awong428

John Jongsun Suh

@MajorLift

Colin Gibson

@cgefx

Paul Ramirez

@pauleramirez

Nathan Fleming

@njfleming

Andrea Li

@Andrea-gli

TJ Wetmore

@TWetmore

Konrad

@konradkop

Edward Cho

@EdwardCho1231

Jason Liggayu

@JasonLigg

Miguel Gonzalez

@MigGonzalez

Warren Tait

@Whtait

Nathaniel Adams

@nathanielBadams

Sam Haar

@samhaar

Gary Slootskiy

@garyslootskiy

Robin Yoong

@robinyoong

Grace Kim

@gracekiim

Alex Sanhueza

@alexsanhueza

Wyatt Bell

@wcbell51

John Madrigal

@johnmadrigal

Michael Miller

@mjmiguel

Grace Spletzer

@gspletzer

Hideaki Aomori

@h15200

Nick Healy

@nickhealy

Matt Gin

@chunsonhoag

Stephanie Wood

@stephwood

Kyle Combs

@texpatnyc

Jason Ou

@jasonou1994

Anthony Terruso

@discrete-projects

Brandon Marrero

@barndon6190

Kwadwo Asamoah

@addoasa

Abby Chao

@abbychao

Amanda Flink

@aflinky

Kajol Thapa

@kajolthapa

Billy Tran

@btctrl

Paul Rhee

@prheee

Sam Parsons

@sam-parsons

Yoon Choi

@cyoonique

Nancy Dao

@nancyddao

Evan Grobar

@egrobar

Dan Stein

@danst3in

Amruth Uppaluri

@amuuth