Debugging your function

When you write a function in Function service, you may encounter errors while running the function. In this case, you can debug your code by checking the logs from your function.

Example

Assuming you have a function like below:

import { gql, request } from "graphql-request";

globalThis.main = async function (args) {
  const document = gql`
    query ExampleQuery($pokemon: String!) {
      getFuzzyPokemon(pokemon: $pokemon) {
        species
      }
    }
  `;

  console.log(JSON.stringify(args)); // log the input args

  const variables = {
    pokemon: args.pokemon, // e.g., "rayquaza"
  };
  let res = await request("https://graphqlpokemon.favware.tech/v8", document, variables);
  console.log(JSON.stringify(res)); // log the response

  return { species: res.getFuzzyPokemon[0].species };
};

After deploying the function with these steps, you can view the function execution logs using the SDK CLI.

Viewing Function Logs

Use the tailor function logs command to view function execution logs:

tailor function logs

tailor function logs <execution-id>

Example output:

Execution ID: abc123-def456-ghi789
Status: SUCCESS
Started: 2025-02-14T07:16:31Z
Finished: 2025-02-14T07:16:32Z

Logs:
2025-02-14T07:16:31.590771150Z INFO {"pokemon":"ay"}
2025-02-14T07:16:32.467262922Z INFO {"getFuzzyPokemon":[{"species":"rayquaza"}]}

Result:
{"species":"rayquaza"}

Options:

• --json / -j: Output as JSON
• --workspace-id / -w: Specify workspace ID
• --profile / -p: Use workspace profile

For more details, see the Function CLI Reference