How to query JSON fields in Supabase?

 

Step 1: Set Up Your Supabase Project

 

To begin querying JSON fields in Supabase, you first need to set up your Supabase project:

1. Go to the Supabase website.
2. Sign in to your account or create a new one.
3. Create a new project and name it appropriately.

 

Step 2: Create a Table with JSON Field

 

Create a table that contains a JSON field:

In your Supabase dashboard:

• Navigate to the "Table Editor" on the left sidebar.
• Click "New Table" and name your table (e.g., users).
• Add columns to your table. Ensure you add at least one column with the data type jsonb to store JSON data.

For example:

• id: integer (Primary Key, Auto-increment)
• name: text
• metadata: jsonb

After setting up the columns, click "Save" to create your table.

 

Step 3: Insert Data into JSON Field

 

To insert data into the JSON field, you can use the SQL editor within the Supabase dashboard:

Open the SQL editor, and enter the following SQL command to insert data into your users table:

INSERT INTO users (name, metadata) 
VALUES ('Jane Doe', '{"age": 28, "occupation": "developer"}');

Run the query to insert the data.

 

Step 4: Query JSON Fields

 

You can query the JSON fields using SQL queries. Here are some examples:

To select all rows where the metadata includes the occupation of 'developer,' use:

SELECT \* FROM users WHERE metadata->>'occupation' = 'developer';

To extract specific keys from the JSON field, you can use:

SELECT metadata->>'age' AS age FROM users;

This query extracts the age from the JSON field for all users.

 

Step 5: Update Data in JSON Field

 

To update data within the JSON field, use the following approach:

If you wish to update the 'age' for a specific user, you can execute:

UPDATE users 
SET metadata = jsonb\_set(metadata, '{age}', '30') 
WHERE name = 'Jane Doe';

This command updates Jane Doe's age to 30.

 

Step 6: Use Supabase Client for JSON Queries

 

For interacting programmatically, use the Supabase client. Here's an example using JavaScript:

Install the Supabase client:

npm install @supabase/supabase-js

Then, use the client to query JSON data:

import { createClient } from '@supabase/supabase-js'

const supabaseUrl = 'https://your-project-ref.supabase.co'
const supabaseKey = 'your-anon-key'
const supabase = createClient(supabaseUrl, supabaseKey)

const { data, error } = await supabase
  .from('users')
  .select()
  .eq('metadata->>occupation', 'developer')

Replace 'your-project-ref' and 'your-anon-key' with your actual Supabase project credentials.

 

Conclusion

 

You now have a comprehensive understanding of querying JSON fields in Supabase. From setting up the project and creating a table to inserting, querying, updating data, and using the Supabase client, this guide helps you manage JSON data effectively within Supabase. Remember to replace placeholder values with your actual project details when implementing.