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History
This warning has existed in two forms in JSHint and ESLint. It has never
existing in JSLint. It was introduced in the r11 version of JSHint and has
remained both JSHint and ESLint ever since.

In JSHint prior to version 1.0.0 the warning given is "Too many parameters
per function. ({a})"

In JSHint 1.0.0 and above the message is "This function has too many
parameters ({a})"

In ESLint the message is the slightly more descriptive "This function has too
many parameters ({a}). Maximum allowed is {b}"


The situations that produce the warning have not changed despite changes to the
text of the warning itself.
When do I get this error?
The "Too many parameters    per function. ({a})" error, and the alternative
"This function has too many    parameters ({a})", is thrown when JSHint or
ESLint encounters an attempt to a function signature with more named
parameters than specified by the configuration. In JSHint the configuration is
controlled by the maxparams option. In ESLint it's max-params. Here's an
example in which we attempt to declare a function that takes 3 arguments:
​x
 
1
/*jshint maxparams: 2 */
2
/*eslint max-params: [1, 2] */
3
function Person(name, age, gender) {
4
    "use strict";
5
    this.name = name;
6
    this.age = age;
7
    this.gender = gender;
8
}
9
​
JSHint found 1 error
Which linter should be used for this code snippet:
 JSLint JSHint ESLint
Which version of the linter should be used:
Update
Version 2.9.0
Line 3:
This function has too many parameters. (3)

Why do I get this error?
This error is raised to highlight a deviation from a coding style. The
ECMAScript standard does not specify a minimum or maximum number of arguments a
function (the following excerpt applies to function declarations but the grammar
for function expressions is almost identical) can accept (ES5
§13):

FunctionDeclaration :

    function Identifier (
FormalParameterListopt ) { FunctionBody }


FormalParameterList :

    Identifier

    FormalParameterList , Identifier

You can see from the grammar quoted above that any number of formal parameters
are valid syntax. However, you may wish to enforce a maximum number to help keep
code readable and maintainable. A common strategy is to accept a single argument
e.g. options, which is usually an object with various properties. We could
rewrite our Person constructor from the example above to use a single named
parameter and therefore conform to the specified coding style:
9
 
1
/*jshint maxparams: 2 */
2
/*eslint max-params: [1, 2] */
3
function Person(options) {
4
    "use strict";
5
    this.name = options.name;
6
    this.age = options.age;
7
    this.gender = options.gender;
8
}
9
​
JSHint found no errors
Which linter should be used for this code snippet:
 JSLint JSHint ESLint
Which version of the linter should be used:
Update
Version 2.9.0

In JSHint 1.0.0 and above you have the ability to ignore any warning with a
special option syntax. The identifier of this warning is W072.
This means you can tell JSHint to not issue this warning with the /*jshint
-W072 */ directive.
In ESLint the rule that generates this warning is named max-params. You can
disable it by setting it to 0, or enable it by setting it to 1.