@babel/helper-validator-identifier
Advanced tools
The @babel/helper-validator-identifier npm package is a utility library used by Babel to validate string identifiers according to the ECMAScript specification. It provides functions to determine if a string is a valid identifier name, which is useful when manipulating code in a way that needs to adhere to JavaScript naming conventions.
isValidIdentifier
Checks if a string is a valid ECMAScript identifier name.
const isValid = require('@babel/helper-validator-identifier').isValidIdentifier;
console.log(isValid('validName')); // true
console.log(isValid('123invalid')); // falseisIdentifierStart
Checks if a character code can start an ECMAScript identifier.
const isIdentifierStart = require('@babel/helper-validator-identifier').isIdentifierStart;
console.log(isIdentifierStart('v'.charCodeAt(0))); // true
console.log(isIdentifierStart('1'.charCodeAt(0))); // falseisIdentifierChar
Checks if a character code can be part of an ECMAScript identifier.
const isIdentifierChar = require('@babel/helper-validator-identifier').isIdentifierChar;
console.log(isIdentifierChar('n'.charCodeAt(0))); // true
console.log(isIdentifierChar('!'.charCodeAt(0))); // falseesutils is a utility box for ECMAScript language tools. It includes a keyword check similar to @babel/helper-validator-identifier, but also provides other utilities for AST manipulation and code generation.
jstransform is a simple utility for pluggable JS syntax transforms using the visitor pattern. It includes utilities for identifier validation, but it is more focused on transforming code rather than just validating identifiers.
jscodeshift is a toolkit for running codemods over multiple JavaScript or TypeScript files. It includes utilities for working with identifiers within the context of transforming code, but it is more comprehensive and is designed for writing and applying codemods.
Validate identifier/keywords name
See our website @babel/helper-validator-identifier for more information.
Using npm:
npm install --save @babel/helper-validator-identifier
or using yarn:
yarn add @babel/helper-validator-identifier
v7.27.1 (2025-04-30)
babel-parser
babel-parser, babel-types
babel-plugin-proposal-destructuring-private, babel-plugin-proposal-do-expressions, babel-traverse
babel-helper-wrap-function, babel-plugin-transform-async-to-generator
babel-helper-remap-async-to-generator, babel-plugin-transform-async-to-generator
babel-helper-fixtures, babel-parser
babel-generator, babel-parser
babel-parser
babel-compat-data, babel-preset-env
babel-traverse
babel-generator
babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining, babel-plugin-proposal-decorators, babel-plugin-transform-arrow-functions, babel-plugin-transform-class-properties, babel-plugin-transform-destructuring, babel-plugin-transform-object-rest-spread, babel-plugin-transform-optional-chaining, babel-plugin-transform-parameters, babel-traverse
babel-runtime-corejs2, babel-runtime-corejs3, babel-runtime
regenerator-runtime dep in @babel/runtime (@nicolo-ribaudo)babel-compat-data, babel-preset-env
babel-compat-data, babel-standalone
babel-register
@babel/register to cts (@liuxingbaoyu)babel-cli, babel-compat-data, babel-core, babel-generator, babel-helper-compilation-targets, babel-helper-fixtures, babel-helper-module-imports, babel-helper-module-transforms, babel-helper-plugin-test-runner, babel-helper-transform-fixture-test-runner, babel-helpers, babel-node, babel-parser, babel-plugin-transform-modules-amd, babel-plugin-transform-modules-commonjs, babel-plugin-transform-modules-systemjs, babel-plugin-transform-modules-umd, babel-plugin-transform-react-display-name, babel-plugin-transform-regenerator, babel-plugin-transform-runtime, babel-plugin-transform-typeof-symbol, babel-plugin-transform-typescript, babel-preset-env, babel-register, babel-standalone, babel-types
babel-plugin-transform-regenerator
babel-helpers, babel-plugin-transform-async-generator-functions, babel-plugin-transform-regenerator, babel-preset-env, babel-runtime-corejs3
babel-helpers, babel-plugin-transform-regenerator
babel-helpers
babel-helpers, babel-plugin-transform-modules-commonjs, babel-runtime-corejs3
interopRequireWildcard size (@liuxingbaoyu)babel-helpers, babel-plugin-transform-async-generator-functions, babel-plugin-transform-regenerator, babel-preset-env, babel-runtime-corejs3
regeneratorRuntime size (@liuxingbaoyu)FAQs
Validate identifier/keywords name
The npm package @babel/helper-validator-identifier receives a total of 60,701,104 weekly downloads. As such, @babel/helper-validator-identifier popularity was classified as popular.
We found that @babel/helper-validator-identifier demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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