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ValKeyper is a Redis-compatible in-memory key-value store that supports a comprehensive set of commands for data manipulation, key management, streams, and transactions.

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Command Categories

Commands are organized into the following categories based on their functionality:

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String Commands

String commands operate on simple key-value pairs where values are strings.
  • SET - Set the string value of a key with optional expiry
  • GET - Get the value of a key
  • ECHO - Echo the given string
  • INCR - Increment the integer value of a key by one
View String Commands Documentation →

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Key Management Commands

Key management commands allow you to inspect, delete, and manage keys across the store.
  • DEL - Delete a key
  • KEYS - Find all keys matching a pattern
  • TYPE - Determine the type of value stored at a key
  • EXPIRE - Set a key’s time to live (handled via SET command)
View Key Management Documentation →

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Stream Commands

Streams are append-only log data structures that support powerful blocking read operations.
  • XADD - Append a new entry to a stream
  • XRANGE - Return a range of elements from a stream
  • XREAD - Read data from one or multiple streams, with optional blocking
View Stream Commands Documentation →

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Transaction Commands

Transactions allow you to execute multiple commands atomically.
  • MULTI - Mark the start of a transaction block
  • EXEC - Execute all commands issued after MULTI
  • DISCARD - Discard all commands issued after MULTI
View Transaction Commands Documentation →

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Connection Commands

  • PING - Ping the server to check connectivity
  • CONFIG - Get configuration parameters
  • INFO - Get information and statistics about the server

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Command Syntax

All commands follow the Redis protocol (RESP) format. Commands are case-insensitive, though this documentation uses uppercase for clarity.

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Example Usage

# Connect using redis-cli
redis-cli -p 6379

# Basic command
SET mykey "Hello World"
# Response: OK

GET mykey
# Response: "Hello World"

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Return Values

Commands return different types of values:
  • Simple strings - Prefixed with +, e.g., +OK
  • Errors - Prefixed with -, e.g., -ERR invalid command
  • Integers - Prefixed with :, e.g., :1
  • Bulk strings - Length-prefixed strings, e.g., $5\r\nHello\r\n
  • Arrays - Collections of other types, e.g., *2\r\n$3\r\nfoo\r\n$3\r\nbar\r\n
  • Null - Represented as $-1\r\n

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Error Handling

When commands fail, ValKeyper returns error messages that describe the issue: 
INCR noninteger
# Response: -ERR value is not an integer or out of range

EXEC
# Response: -ERR EXEC without MULTI

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