> ## Documentation index > Fetch the complete documentation index at: https://upstash.com/docs/llms.txt > Ask it with GET https://upstash.com/docs/ask?q=. Short keywords rank best. > Use these to discover all available pages before exploring further. > Feature requests: https://upstash.com/docs/common/help/feature-requests.md lists what users asked for and how to vote for a request or add one. > Page rating: `GET https://upstash.com/docs/feedback?path=/docs/redis/commands/string/overview&helpful=true` (or `false`) records whether this page helped. An optional `comment` (URL-encoded, at most 500 characters) says what was missing or wrong. It is anonymous and needs no key. Comments hold no code, secrets or personal data. # String commands > Commands for storing and manipulating string values. Append value to a string Decrement integer value by 1 Decrement integer by amount Delete a string when a condition matches Get the digest of a string value Get string value Get value and delete key Get value and set expiration Get substring of string Set value and return old value Increment integer value by 1 Increment integer by amount Increment float by amount Get values of multiple keys Set multiple keys at once Set multiple keys with one expiration Set multiple keys if none exist Set value with ms expiration Set string value Set value with expiration Set value if key doesn't exist Overwrite part of string Get string length