Required. The name of the parameter to mutate. This value must: * be less than 40 characters. * be unique across across all mutations within the rule * consist only of letters, digits or _ (underscores) For event edit rules, the name may also be set to 'eventName' to modify the eventName in place.
parameterValue
string
Required. The value mutation to perform. * Must be less than 100 characters. * To specify a constant value for the param, use the value's string. * To copy value from another parameter, use syntax like "[[other_parameter]]" For more details, see thishelp center article.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-04-02 UTC."],[[["\u003cp\u003eDefines an event parameter for mutation using JSON representation with \u003ccode\u003eparameter\u003c/code\u003e and \u003ccode\u003eparameterValue\u003c/code\u003e fields.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eparameter\u003c/code\u003e specifies the event parameter's name for mutation, adhering to specific length, uniqueness, and character constraints.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eparameterValue\u003c/code\u003e defines the mutation, either as a constant string value or by copying from another parameter using a specific syntax.\u003c/p\u003e\n"]]],["The provided JSON structure defines event parameter mutations, requiring a `parameter` name and its `parameterValue`. The `parameter` must be a unique string (under 40 characters), containing letters, digits, or underscores; 'eventName' is also acceptable for event edits. `parameterValue` (under 100 characters) can be a constant string or reference another parameter using the format \"\\[\\[other_parameter\\]\\]\". This controls how an event's parameter should be changed.\n"],null,["# ParameterMutation\n\n- [JSON representation](#SCHEMA_REPRESENTATION)\n\nDefines an event parameter to mutate.\n\n| JSON representation |\n|-----------------------------------------------------------|\n| ``` { \"parameter\": string, \"parameterValue\": string } ``` |\n\n| Fields ||\n|------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `parameter` | `string` Required. The name of the parameter to mutate. This value must: \\* be less than 40 characters. \\* be unique across across all mutations within the rule \\* consist only of letters, digits or _ (underscores) For event edit rules, the name may also be set to 'eventName' to modify the eventName in place. |\n| `parameterValue` | `string` Required. The value mutation to perform. \\* Must be less than 100 characters. \\* To specify a constant value for the param, use the value's string. \\* To copy value from another parameter, use syntax like \"\\[\\[other_parameter\\]\\]\" For more details, see this [help center article](https://support.google.com/analytics/answer/10085872#modify-an-event&zippy=%2Cin-this-article%2Cmodify-parameters). |"]]
