Require spacing around infix operators

🔧 Fixable

Some problems reported by this rule are automatically fixable by the --fix command line option

This rule was deprecated in ESLint v8.53.0. Please use the corresponding rule in @stylistic/eslint-plugin-js.

While formatting preferences are very personal, a number of style guides require spaces around operators, such as:

var sum = 1 + 2;

Proponents of this rule believe that it makes code easier to read and can more easily highlight potential errors, such as:

var sum = i+++2;

While this is valid JavaScript syntax, it is hard to determine what the author intended.

Rule Details

This rule is aimed at ensuring there are spaces around infix operators.


This rule accepts a single options argument with the following defaults:

"space-infix-ops": ["error", { "int32Hint": false }]


Set the int32Hint option to true (default is false) to allow write a|0 without space.

var foo = bar|0; // `foo` is forced to be signed 32 bit integer

Examples of incorrect code for this rule:

Open in Playground
/*eslint space-infix-ops: "error"*/


a+ b

a +b


const a={b:1};

var {b=0}=bar;

function foo(a=0) { }

Examples of correct code for this rule:

Open in Playground
/*eslint space-infix-ops: "error"*/

a + b

a       + b

a ? b : c

const a = {b:1};

var {b = 0} = bar;

function foo(a = 0) { }

When Not To Use It

You can turn this rule off if you are not concerned with the consistency of spacing around infix operators.


This rule was introduced in ESLint v0.2.0.


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