47705a8968
* fix: rewrite relative URLs when syncing to GitHub discussion Relative URLs back to supabse.com won't work in GitHub discussions, so rewrite them back to absolute URLs starting with https://supabase.com * fix: replace all supabase urls with relative urls * chore: add linting for relative urls * chore: bump linter version * Prettier --------- Co-authored-by: Chris Chinchilla <chris.ward@supabase.io>
117 lines
3.7 KiB
Plaintext
117 lines
3.7 KiB
Plaintext
---
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id: 'pgjwt'
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title: 'pgjwt: JSON Web Tokens'
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description: 'Encode and decode JWTs in PostgreSQL'
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---
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{/* supa-mdx-lint-disable-next-line Rule004ExcludeWords */}
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<Admonition type="deprecation">
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The `pgjwt` extension is deprecated in projects using Postgres 17. It continues to be supported in projects using Postgres 15, but will need to dropped before those projects are upgraded to Postgres 17. See the [Upgrading to Postgres 17 notes](/docs/guides/platform/upgrading#upgrading-to-postgres-17) for more information.
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</Admonition>
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The [`pgjwt`](https://github.com/michelp/pgjwt) (Postgres JSON Web Token) extension allows you to create and parse [JSON Web Tokens (JWTs)](https://en.wikipedia.org/wiki/JSON_Web_Token) within a Postgres database. JWTs are commonly used for authentication and authorization in web applications and services.
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## Enable the extension
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<Tabs
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scrollable
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size="small"
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type="underlined"
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defaultActiveId="dashboard"
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queryGroup="database-method"
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>
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<TabPanel id="dashboard" label="Dashboard">
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1. Go to the [Database](/dashboard/project/_/database/tables) page in the Dashboard.
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2. Click on **Extensions** in the sidebar.
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3. Search for `pgjwt` and enable the extension.
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</TabPanel>
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<TabPanel id="sql" label="SQL">
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{/* prettier-ignore */}
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```sql
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-- Enable the "pgjwt" extension
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create extension pgjwt schema extensions;
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-- Disable the "pgjwt" extension
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drop extension if exists pgjwt;
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```
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Even though the SQL code is `create extension`, this is the equivalent of enabling the extension.
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To disable an extension you can call `drop extension`.
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It's good practice to create the extension within a separate schema (like `extensions`) to keep the `public` schema clean.
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</TabPanel>
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</Tabs>
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## API
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- [`sign(payload json, secret text, algorithm text default 'HSA256')`](https://github.com/michelp/pgjwt#usage): Signs a JWT containing _payload_ with _secret_ using _algorithm_.
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- [`verify(token text, secret text, algorithm text default 'HSA256')`](https://github.com/michelp/pgjwt#usage): Decodes a JWT _token_ that was signed with _secret_ using _algorithm_.
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Where:
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- `payload` is an encrypted JWT represented as a string.
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- `secret` is the private/secret passcode which is used to sign the JWT and verify its integrity.
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- `algorithm` is the method used to sign the JWT using the secret.
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- `token` is an encrypted JWT represented as a string.
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## Usage
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Once the extension is installed, you can use its functions to create and parse JWTs. Here's an example of how you can use the `sign` function to create a JWT:
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{/* prettier-ignore */}
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```sql
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select
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extensions.sign(
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payload := '{"sub":"1234567890","name":"John Doe","iat":1516239022}',
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secret := 'secret',
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algorithm := 'HS256'
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);
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```
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The `pgjwt_encode` function returns a string that represents the JWT, which can then be safely transmitted between parties.
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{/* prettier-ignore */}
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```
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sign
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---------------------------------
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eyJhbGciOiJIUzI1NiIsInR5cCI6IkpX
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VCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiw
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ibmFtZSI6IkpvaG4gRG9lIiwiaWF0Ijo
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xNTE2MjM5MDIyfQ.XbPfbIHMI6arZ3Y9
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22BhjWgQzWXcXNrz0ogtVhfEd2o
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(1 row)
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```
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To parse a JWT and extract its claims, you can use the `verify` function. Here's an example:
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{/* prettier-ignore */}
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```sql
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select
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extensions.verify(
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token := 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYW1lIjoiRm9vIn0.Q8hKjuadCEhnCPuqIj9bfLhTh_9QSxshTRsA5Aq4IuM',
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secret := 'secret',
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algorithm := 'HS256'
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);
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```
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Which returns the decoded contents and some associated metadata.
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{/* prettier-ignore */}
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```sql
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header | payload | valid
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-----------------------------+----------------+-------
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{"alg":"HS256","typ":"JWT"} | {"name":"Foo"} | t
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(1 row)
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```
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## Resources
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- Official [`pgjwt` documentation](https://github.com/michelp/pgjwt)
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