bash - Exporting JSON to environment variables

Bash - Exporting JSON to environment variables

Exporting JSON data to environment variables in Bash involves converting the JSON data into a format suitable for export. One common approach is to use the jq tool, which is a lightweight and flexible command-line JSON processor.

Here's a step-by-step guide:

1. Install jq:

Ensure that you have jq installed on your system. You can install it using package managers like apt (for Debian/Ubuntu) or brew (for macOS).

# For Debian/Ubuntu sudo apt-get install jq # For macOS (using Homebrew) brew install jq

2. Create a Bash script:

Create a Bash script that reads the JSON data, processes it with jq, and exports the variables.

#!/bin/bash json_data='{"key1": "value1", "key2": "value2", "key3": "value3"}' # Convert JSON to Bash variables using jq export $(echo $json_data | jq -r 'to_entries | .[] | "export \(.key)=\(.value)"')

Replace the json_data variable with your actual JSON data.

3. Run the script:

Save the script to a file (e.g., export_json.sh) and make it executable:

chmod +x export_json.sh

Run the script:

./export_json.sh

4. Verify the exported variables:

Check if the variables are correctly exported:

echo $key1 echo $key2 echo $key3

You should see the corresponding values.

Note:

  • This approach assumes that the keys and values in the JSON are simple strings. If your JSON contains nested structures or non-string values, you might need to adjust the jq filter accordingly.

  • Ensure that your JSON data is properly formatted and escaped within the script.

  • If your JSON data is in a file, you can use jq with the -f option to read from a file:

    json_data=$(cat your_file.json) export $(echo $json_data | jq -r 'to_entries | .[] | "export \(.key)=\(.value)"')

Adjust the script based on your specific JSON structure and requirements.

Examples

  1. "Bash export JSON to environment variable"

    • Code Implementation:
      export MY_VARIABLE=$(echo '{"key": "value"}' | jq -r '.key')
    • Description: Uses jq to extract a specific key from a JSON string and exports it as an environment variable.

  2. "Bash set environment variable from JSON"

    • Code Implementation:
      export MY_VARIABLE=$(jq -r '.key' <<< '{"key": "value"}')
    • Description: Utilizes a here-string to pass JSON data to jq and sets the result as an environment variable.

  3. "Bash parse JSON and export variable"

    • Code Implementation:
      export MY_VARIABLE=$(echo '{"key": "value"}' | jq -r '.key')
    • Description: Uses jq to parse the JSON and extract a specific key, exporting it as an environment variable.

  4. "Bash convert JSON to environment variable"

    • Code Implementation:
      export MY_VARIABLE=$(jq -r '.key' <<< '{"key": "value"}')
    • Description: Uses jq to extract a key from JSON data and sets it as an environment variable using a here-string.

  5. "Bash export JSON value to variable"

    • Code Implementation:
      MY_VARIABLE=$(echo '{"key": "value"}' | jq -r '.key') export MY_VARIABLE
    • Description: Uses jq to extract a key from JSON data and then exports the variable in a separate step.

  6. "Bash JSON to environment variable using jq"

    • Code Implementation:
      export MY_VARIABLE=$(jq -r '.key' <<< '{"key": "value"}')
    • Description: Uses jq to extract a key from JSON data and exports it as an environment variable.

  7. "Bash set variable from JSON with jq"

    • Code Implementation:
      MY_VARIABLE=$(echo '{"key": "value"}' | jq -r '.key') export MY_VARIABLE
    • Description: Parses JSON using jq and sets a variable, followed by exporting it as an environment variable.

  8. "Bash JSON to environment variable example"

    • Code Implementation:
      export MY_VARIABLE=$(jq -r '.key' <<< '{"key": "value"}')
    • Description: Demonstrates an example of using jq to extract a key from JSON and export it as an environment variable.

  9. "Bash extract value from JSON to variable"

    • Code Implementation:
      MY_VARIABLE=$(echo '{"key": "value"}' | jq -r '.key') export MY_VARIABLE
    • Description: Uses jq to extract a key from JSON data and sets it as a variable, then exports it.

  10. "Bash set environment variable from JSON string"

    • Code Implementation:
      export MY_VARIABLE=$(echo '{"key": "value"}' | jq -r '.key')
    • Description: Uses jq to extract a key from a JSON string and exports it as an environment variable.

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