The init context (aka "init code") is code in the global context that has access to a few functions not accessible during main script execution (aka "VU context" or "VU code"). For a more detailed description see Running k6.
|open( filePath, [mode] )||Opens a file and reads all the contents into memory.|
The k6 module contains k6-specific functionality.
|check(val, sets, [tags])||Runs one or more checks on a value and generates a pass/fail result but does not throw errors or otherwise interrupt execution upon failure.|
|fail([err])||Throws an error, failing and aborting the current VU script iteration immediately.|
|group(name, fn)||Runs code inside a group. Used to organize results in a test.|
|randomSeed(int)||Set seed to get a reproducible pseudo-random number using Math.random.|
|sleep(t)||Suspends VU execution for the specified duration.|
The k6/crypto module provides common hashing functionality available in the GoLang crypto package.
|createHash(algorithm)||Create a Hasher object, allowing the user to add data to hash multiple times, and extract hash digests along the way.|
|createHMAC(algorithm, secret)||Create an HMAC hashing object, allowing the user to add data to hash multiple times, and extract hash digests along the way.|
|hmac(algorithm, secret, data, outputEncoding)||Use HMAC to sign an input string.|
|md4(input, outputEncoding)||Use MD4 to hash an input string.|
|md5(input, outputEncoding)||Use MD5 to hash an input string.|
|randomBytes(int)||Return an array with a number of cryptographically random bytes.|
|ripemd160(input, outputEncoding)||Use RIPEMD-160 to hash an input string.|
|sha1(input, outputEncoding)||Use SHA-1 to hash an input string.|
|sha256(input, outputEncoding)||Use SHA-256 to hash an input string.|
|sha384(input, outputEncoding)||Use SHA-384 to hash an input string.|
|sha512(input, outputEncoding)||Use SHA-512 to hash an input string.|
|sha512_224(input, outputEncoding)||Use SHA-512/224 to hash an input string.|
|sha512_256(input, outputEncoding)||Use SHA-512/256 to hash an input string.|
The data module, added in k6 v0.30.0, provides helpers to work with data.
|SharedArray||read-only array like structure that shares memory between VUs|
The k6/http module contains functionality for performing HTTP transactions.
|batch( requests )||Issue multiple HTTP requests in parallel (like e.g. browsers tend to do).|
|cookieJar()||Get active HTTP Cookie jar.|
|del( url, [body], [params] )||Issue an HTTP DELETE request.|
|file( data, [filename], [contentType] )||Create a file object that is used for building multi-part requests.|
|get( url, [params] )||Issue an HTTP GET request.|
|options( url, [body], [params] )||Issue an HTTP OPTIONS request.|
|patch( url, [body], [params] )||Issue an HTTP PATCH request.|
|post( url, [body], [params] )||Issue an HTTP POST request.|
|put( url, [body], [params] )||Issue an HTTP PUT request.|
|request( method, url, [body], [params] )||Issue any type of HTTP request.|
|setResponseCallback(expectedStatuses)||Sets a response callback to mark responses as expected.|
|expectedStatuses( statusCodes )||Create a callback for setResponseCallback that checks status codes.|
|CookieJar||Used for storing cookies, set by the server and/or added by the client.|
|FileData||Used for wrapping data representing a file when doing multipart requests (file uploads).|
|Params||Used for setting various HTTP request-specific parameters such as headers, cookies, etc.|
|Response||Returned by the http.* methods that generate HTTP requests.|
All values added to a custom metric can optionally be tagged which can be useful when analysing the test results.
|Counter||A metric that cumulatively sums added values.|
|Gauge||A metric that stores the min, max and last values added to it.|
|Rate||A metric that tracks the percentage of added values that are non-zero.|
|Trend||A metric that allows for calculating statistics on the added values (min, max, average and percentiles).|
The k6/net/grpc module, added in k6 v0.29.0, provides a gRPC client for Remote Procedure Calls (RPC) over HTTP/2.
The k6 gRPC API is currently considered in beta and is subject to change. Future k6 versions might have slight differences in the method and type signatures described in this documentation.
|Client||gRPC client used for making RPC calls to a gRPC Server.|
|Client.load(importPaths, ...protoFiles)||Loads and parses the given protocol buffer definitions to be made available for RPC requests.|
|Client.connect(address [,params])||Connects to a given gRPC service.|
|Client.invoke(url, request [,params])||Makes an unary RPC for the given service/method and returns a Response.|
|Client.close()||Close the connection to the gRPC service.|
|Params||RPC Request specific options.|
|Response||Returned by RPC requests.|
|Constants||Define constants to distinguish between gRPC Response statuses.|
|connect( url, params, callback )||Create a WebSocket connection, and provides a Socket client to interact with the service. The method blocks the test finalization until the connection is closed.|
|Socket||WebSocket client used to interact with a WS connection.|
|Socket.close()||Close the WebSocket connection.|
|Socket.on(event, callback)||Set up an event listener on the connection for any of the following events:|
|Socket.ping()||Send a ping.|
|Socket.setInterval(callback, interval)||Call a function repeatedly at certain intervals, while the connection is open.|
|Socket.setTimeout(callback, period)||Call a function with a delay, if the connection is open.|
|utils||Small utility functions useful in every day load testing|
|expect||Micro-framework for writing tests in a style of Jest or ava.|
|httpx||Wrapper around the http that simplifies session handling|
|-||Documentation for other libraries will be added shortly.|
The complete list of supported libraries can be viewed on jslib.k6.io.
Libraries hosted on jslib have versions. For example "httpx.js" library currently has v0.0.1, v0.0.2 and v0.0.3.
We recommend that you use the last version available at the time of writing your k6 scripts. Older versions will continue to be hosted on jslib, so you don't have to worry about your scripts breaking.
This documentation is for the last version of these libraries. If the examples documented here don't work, please check that you are using the latest version.
If you don't want to depend on jslib or want to make modifications to the code, you can download the libraries and use them locally.
Error codes are unique numbers that can be used to identify and handle different application and network errors more easily. For the moment, these error codes are applicable only for errors that happen during HTTP requests, but they will be reused and extended to support other protocols in future k6 releases.
When an error occurs, its code is determined and returned as both the error_code field of the http.Response object, and also attached as the error_code tag to any metrics associated with that request. Additionally, for more details, the error metric tag and http.Response field will still contain the actual string error message.
Error codes for different errors are as distinct as possible, but for easier handling and grouping, codes in different error categories are also grouped in broad ranges. The current error code ranges are:
- 1000-1099 - General errors
- 1100-1199 - DNS errors
- 1200-1299 - TCP errors
- 1300-1399 - TLS errors
- 1400-1499 - HTTP 4xx errors
- 1500-1599 - HTTP 5xx errors
- 1600-1699 - HTTP/2 specific errors
The following specific error codes are currently defined:
- 1000: A generic error that isn't any of the ones listed below.
- 1010: A non-TCP network error - this is a place holder there is no error currently known to trigger it.
- 1100: A generic DNS error that isn't any of the ones listed below.
- 1101: No IP for the provided host was found.
- 1110: Blacklisted IP was resolved or a connection to such was tried to be established.
- 1111: Blacklisted hostname using The Block Hostnames option.
- 1200: A generic TCP error that isn't any of the ones listed below.
- 1201: A "broken pipe" on write - the other side has likely closed the connection.
- 1202: An unknown TCP error - We got an error that we don't recognize but it is from the operating system and has errno set on it. The message in error includes the operation(write,read) and the errno, the OS, and the original message of the error.
- 1210: General TCP dial error.
- 1211: Dial timeout error - the timeout for the dial was reached.
- 1212: Dial connection refused - the connection was refused by the other party on dial.
- 1213: Dial unknown error.
- 1220: Reset by peer - the connection was reset by the other party, most likely a server.
- 1300: General TLS error
- 1310: Unknown authority - the certificate issuer is unknown.
- 1311: The certificate doesn't match the hostname.
- 1400 to 1499: error codes that correspond to the HTTP 4xx status codes for client errors
- 1500 to 1599: error codes that correspond to the HTTP 5xx status codes for server errors
- 1600: A generic HTTP/2 error that isn't any of the ones listed below.
- 1610: A general HTTP/2 GoAway error.
- 1611 to 1629: HTTP/2 GoAway errors with the value of the specific HTTP/2 error code added to 1611.
- 1630: A general HTTP/2 stream error.
- 1631 to 1649: HTTP/2 stream errors with the value of the specific HTTP/2 error code added to 1631.
- 1650: A general HTTP/2 connection error.
- 1651 to 1669: HTTP/2 connection errors with the value of the specific HTTP/2 error code added to 1651.
- 1701: Decompression error.