Safely generate and compose SQL statements with tagged template literals. Written in TypeScript.

import {sql} from '@mojojs/sql';

// {text: 'SELECT * FROM users WHERE name = $1', values: ['sebastian']}
const {text, values} = sql`SELECT * FROM users WHERE name = ${'sebastian'}`.toQuery();

To prevent SQL injection attacks, all interpolated values become placeholders in the generated query. Partial statements can even be used recursively to build more complex queries.

const role = 'admin';
const partialQuery = sql`AND role = ${role}`;
const name = 'root';

// {text: 'SELECT * FROM users WHERE name = $1 AND role = $2', values: ['root', 'admin']}
const {text, values} = sql`SELECT * FROM users WHERE name = ${name} ${partialQuery}`.toQuery();

Make partial statements optional to dynamically generate WHERE clauses.

const optionalPart = foo === true ? sql`AND foo IS NOT NULL` : sql``;
const {text, values} = sql`SELECT * FROM users WHERE name = ${'sebastian'} ${optionalPart}`.toQuery();

And if you need a little more control over the generated SQL query, you can of course also bypass safety features with the tagged template literal sqlUnsafe. But make sure to handle unsafe values yourself with appropriate escaping functions for your database. For PostgreSQL there are escapeLiteral and escapeIdentifier functions included with this package.

import {sql, sqlUnsafe, escapeLiteral} from '@mojojs/sql';

const role = 'role = ' + escapeLiteral('power user');
const partialQuery = sqlUnsafe`AND ${role}`;
const name = 'root';

// {text: "SELECT * FROM users WHERE name = $1 AND role = 'power user'", values: ['root']}
const {text, values} = sql`SELECT * FROM users WHERE name = ${name} ${partialQuery}`.toQuery();

For databases that do not support numbered placeholders like $1 and $2, you can set a custom character with the placeholder option.

// {text: 'SELECT * FROM users WHERE name = ?', values: ['root']}
const {text, values} = sql`SELECT * FROM users WHERE name = ${'root'}`.toQuery({placeholder: '?'});

Editor Support

• Visual Studio Code

Installation

All you need is Node.js 16.0.0 (or newer).

$ npm install @mojojs/sql

Support

If you have any questions the documentation might not yet answer, don't hesitate to ask in the Forum, on Matrix, or IRC.