---
title: "Validate Expression"
method: POST
path: "/workspaces/{workspace_id}/editor/expressions/validate"
tags: ["editor"]
---

# Validate Expression

`POST /workspaces/{workspace_id}/editor/expressions/validate`

## Request

- Base URL: `https://platform.tracecat.com/api`
- URL: `https://platform.tracecat.com/api/workspaces/{workspace_id}/editor/expressions/validate`
- Auth: one of:
  - API key in cookie `fastapiusersauth`
  - HTTP bearer

LSP endpoint for validating template expressions using the Lark grammar.

This endpoint provides syntax validation and token information for syntax highlighting
of template expressions like: ACTIONS.step1.result, SECRETS.api_key, etc.

## Path parameters

- `workspace_id` string, uuid, required

## Request body

- ExpressionValidationRequest
  - `expression` string, required

## Response `200`

Successful Response

- ExpressionValidationResponse
  - `is_valid` boolean, required
  - `errors` ValidationError[]
    - `loc` union[], required
      - union
        - string
        - integer
    - `msg` string, required
    - `type` string, required
    - `input` unknown
    - `ctx` object
  - `tokens` SyntaxToken[]
    - `type` string, required
    - `value` string, required
    - `start` integer, required
    - `end` integer, required

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/tracecat/apis/tracecat-api.md) - [All operations](https://skmtc.dev/tracecat/apis/tracecat-api/llms.txt) - [OpenAPI document](https://skmtc.dev/tracecat/apis/tracecat-api/revisions/2efdda25045f?raw)