Upstash REST wrong number of arguments: your path segments dont match the command arity

TL;DR: ERR wrong number of arguments means your REST path has too many or too few segments versus the Redis command signature. Confirm Count the segments. Compare against the Redis command reference for that command.

The error

{ "error": "ERR wrong number of arguments for 'get' command" }

The fix

1. GET foo becomes /get/foo (one argument)
2. /get/foo/bar is two arguments to GET: wrong.
3. MGET takes many: /mget/foo1/foo2/foo3 is correct. The usual mistake is forgetting that some commands take option flags as extra path segments: SET with expiry is /set/foo/bar/EX/100, not /set/foo/bar with the expiry somewhere else.
4. Values containing slashes break positional parsing: a value like "a/b" becomes two segments. POST the value as the request body instead: the body is appended as the last parameter.
5. For SET with options after the value, pass the options as query params on a POST: /set/foo?EX=100 with the value in the body.
6. Or send the whole command as a JSON array body: '["SET", "foo", "bar", "EX", 100]'.

When to use this

• You are seeing this exact error message; match the block above, not just part of it.
• The failing call matches the scenario in the title: Upstash REST wrong number of arguments.
• You want the fastest verified fix before digging through logs.

When not to use this

• Your error text differs from the block above; close cousins often have different causes.
• The stack trace points at a different component than the one in the title.
• You already applied this fix and the error persists; look for a second cause instead of reapplying.

Compatibility

• Not pinned to a specific version; follows current Upstash behavior.

Verified against Upstash REST API docs: the REST convention is REST_URL/COMMAND/arg1/.../argN in Redis protocol order; error example { error: ERR wrong number of arguments for 'get' command }. Source: https://upstash.com/docs/redis/features/restapi