zulip/templates/zerver/api/rest-error-handling.md

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# Error Handling
Zulip's API will always return a JSON format response.
The HTTP status code indicates whether the request was successful
(200 = success, 40x = user error, 50x = server error). Every response
will contain at least two keys: `msg` (a human-readable error message)
and `result`, which will be either `error` or `success` (this is
redundant with the HTTP status code, but is convenient when printing
responses while debugging).
For some common errors, Zulip provides a `code` attribute. Where
present, clients should check `code`, rather than `msg`, when looking
for specific error conditions, since the `msg` strings are
internationalized (e.g. the server will send the error message
translated into French if the user has a French locale).
Each endpoint documents its own unique errors; below, we document
errors common to many endpoints:
## Invalid API key
A typical failed JSON response for when the API key is invalid:
{generate_code_example|invalid-api-key|fixture}
## Missing request argument(s)
A typical failed JSON response for when a required request argument
is not supplied:
{generate_code_example|missing-request-argument-error|fixture}
## User not authorized for query
A typical failed JSON response for when the user is not authorized
for a query:
{generate_code_example|user-not-authorized-error|fixture}