Non-blocking PostgreSQL client for Node.js written in TypeScript.
To install the latest version of this library:
$ npm install ts-postgres@latest
- Supports both binary and text value formats
- Result data is currently sent in binary format only
- Multiple queries can be sent at once (pipeline)
- Extensible value model
- Hybrid query result object
- Iterable (synchronous or asynchronous; one row at a time)
The client uses an async/await-based programming model.
Waiting on the result iterator returns the complete query result.
If the query fails, an exception is thrown.
The client constructor takes an optional Configuration object.
For example, to connect to a remote host use the host configuration key:
The following table lists the various configuration options and their default value when applicable.
||The username of the process owner|
||Default value mapping for built-in types|
Passing query parameters
Query parameters use the format
When a specific data type is not inferrable from the query, PostgreSQL
DataType.Text as the default data type (which is mapped to the
string type in TypeScript). An explicit type can be provided in two
Using type cast in the query, e.g.
By passing a list of types to the query method:;;
Note that the
number type in TypeScript has a maximum safe integer
value which lies between and
DataType.Int8 – given by
Number.MAX_SAFE_INTEGER. The maximum safe integer data type to use
bigint type is not currently supported.
Whether we're operating on a stream or an already waited for result set, the iterator interface provides the most high-level row interface. This also applies when using the spread operator:
Each row provides direct access to values through its
data attribute, but we can also get a value by name using the
for of rows
Note that values are polymorphic and need to be explicitly cast to a concrete type such as
This interface is available on the already waited for result object. It makes data available in the
rows attribute as an array of arrays (of values).
for of result.rows
This is the most efficient way to work with result data. Column names are available as the
names attribute of a result.
The query command accepts a single query only. If you need to send multiple queries, just call the method multiple times. For example, to send an update command in a transaction:
client.query'begin';client.query'update ...';await client.query'commit';
The queries are sent back to back over the wire, but PostgreSQL still processes them one at a time, in the order they were sent (first in, first out).
You can prepare a query and subsequently execute it multiple times. This is also known as a "prepared statement".
;for await of statement.execute
When the prepared statement is no longer needed, it should be closed to release the resource.
Prepared statements can be used (executed) multiple times, even concurrently.
Queries with parameters are sent using the prepared statement variant of the extended query protocol. In this variant, the type of each parameter is determined prior to parameter binding, ensuring that values are encoded in the correct format.
If a query has no parameters, it uses the portal variant which saves a round trip.
The copy commands are not supported.
How do I set up a pool of connections? You can for example use the generic-pool library:;;pool.use...
Use the following environment variable to run tests in "benchmark" mode.
$ NODE_ENV=benchmark npm run test
ts-postgres is free software. If you encounter a bug with the library please open an issue on the GitHub repo.
Copyright (c) 2018-2020 Malthe Borch (email@example.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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