knex.js
A SQL query builder that is flexible, portable, and fun to use!
A batteries-included, multi-dialect (MSSQL, MySQL, PostgreSQL, SQLite3, Oracle (including Oracle Wallet Authentication)) query builder for Node.js, featuring:
- transactions
- connection pooling
- streaming queries
- both a promise and callback API
- a thorough test suite
Node.js versions 10+ are supported.
- Take a look at the full documentation to get started!
- Browse the list of plugins and tools built for knex
- Check out our recipes wiki to search for solutions to some specific problems
- In case of upgrading from an older version, see migration guide
You can report bugs and discuss features on the GitHub issues page or send tweets to @kibertoad.
For support and questions, join our Gitter channel.
For knex-based Object Relational Mapper, see:
- https://github.com/Vincit/objection.js
- https://github.com/mikro-orm/mikro-orm
- https://bookshelfjs.org
To see the SQL that Knex will generate for a given query, you can use Knex Query Lab
Examples
We have several examples on the website. Here is the first one to get you started:
const knex = require('knex')({
client: 'sqlite3',
connection: {
filename: './data.db',
},
});
try {
// Create a table
await knex.schema
.createTable('users', table => {
table.increments('id');
table.string('user_name');
})
// ...and another
.createTable('accounts', table => {
table.increments('id');
table.string('account_name');
table
.integer('user_id')
.unsigned()
.references('users.id');
})
// Then query the table...
const insertedRows = await knex('users').insert({ user_name: 'Tim' })
// ...and using the insert id, insert into the other table.
await knex('accounts').insert({ account_name: 'knex', user_id: insertedRows[0] })
// Query both of the rows.
const selectedRows = await knex('users')
.join('accounts', 'users.id', 'accounts.user_id')
.select('users.user_name as user', 'accounts.account_name as account')
// map over the results
const enrichedRows = selectedRows.map(row => ({ ...row, active: true }))
// Finally, add a catch statement
} catch(e) {
console.error(e);
};
TypeScript example
import { Knex, knex } from 'knex'
interface User {
id: number;
age: number;
name: string;
active: boolean;
departmentId: number;
}
const config: Knex.Config = {
client: 'sqlite3',
connection: {
filename: './data.db',
},
});
const knexInstance = knex(config);
try {
const users = await knex<User>('users').select('id', 'age');
} catch (err) {
// error handling
}
Usage as ESM module
If you are launching your Node application with --experimental-modules, knex.mjs should be picked up automatically and named ESM import should work out-of-the-box. Otherwise, if you want to use named imports, you'll have to import knex like this:
import { knex } from 'knex/knex.mjs'
You can also just do the default import:
import knex from 'knex'
If you are not using TypeScript and would like the IntelliSense of your IDE to work correctly, it is recommended to set the type explicitly:
/**
* @type {Knex}
*/
const database = knex({
client: 'mysql',
connection: {
host : '127.0.0.1',
user : 'your_database_user',
password : 'your_database_password',
database : 'myapp_test'
}
});
database.migrate.latest();
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