# babel-plugin-transform-es3-property-literals > Ensure that reserved words are quoted in object property keys ## Example **In** ```javascript var foo = { catch: function () {} }; ``` **Out** ```javascript var foo = { "catch": function () {} }; ``` ## Installation ```sh npm install --save-dev babel-plugin-transform-es3-property-literals ``` ## Usage ### Via `.babelrc` (Recommended) **.babelrc** ```json { "plugins": ["transform-es3-property-literals"] } ``` ### Via CLI ```sh babel --plugins transform-es3-property-literals script.js ``` ### Via Node API ```javascript require("babel-core").transform("code", { plugins: ["transform-es3-property-literals"] }); ```