Remove Memories Safely

Deleting memories is how you honor compliance requests, undo bad data, or clean up expired sessions. Mem0 lets you delete a specific memory, a list of IDs, or everything that matches a filter.

Key terms

• memory_id: Unique ID returned by add/search identifying the record to delete.
• batch_delete: API call that removes up to 1000 memories in one request.
• delete_all: Filter-based deletion by user, agent, run, or metadata.
• immutable: Flagged memories that cannot be updated; delete + re-add instead.

How the delete flow works

Delete a single memory (Platform)

client = MemoryClient(api_key="your-api-key")

memory_id = "your_memory_id" client.delete(memory_id=memory_id)

```javascript JavaScript
import MemoryClient from 'mem0ai';

const client = new MemoryClient({ apiKey: "your-api-key" });

client.delete("your_memory_id")
  .then(result => console.log(result))
  .catch(error => console.error(error));

Batch delete multiple memories (Platform)

client = MemoryClient(api_key="your-api-key")

delete_memories = [ {"memory_id": "id1"}, {"memory_id": "id2"} ]

response = client.batch_delete(delete_memories) print(response)

```javascript JavaScript
import MemoryClient from 'mem0ai';

const client = new MemoryClient({ apiKey: "your-api-key" });

const deleteMemories = [
  { memory_id: "id1" },
  { memory_id: "id2" }
];

client.batchDelete(deleteMemories)
  .then(response => console.log('Batch delete response:', response))
  .catch(error => console.error(error));

Delete memories by filter (Platform)

client = MemoryClient(api_key="your-api-key")

Delete all memories for a specific user

client.delete_all(user_id="alice")

Delete all memories for a specific agent

client.delete_all(agent_id="support-bot")

Delete all memories for a specific run

client.delete_all(run_id="session-xyz")

```javascript JavaScript
import MemoryClient from 'mem0ai';

const client = new MemoryClient({ apiKey: "your-api-key" });

client.deleteAll({ userId: "alice" })
  .then(result => console.log(result))
  .catch(error => console.error(error));

You can also filter by other parameters such as:

• agent_id
• run_id
• metadata (as JSON string)

Wildcard deletes

Setting a filter to "*" deletes all memories for that entity type across the entire project. This is an intentionally explicit opt-in to bulk deletion.

client = MemoryClient(api_key="your-api-key")

Delete all memories across every user in the project

client.delete_all(user_id="*")

Delete all memories across every agent in the project

client.delete_all(agent_id="*")

Full project wipe: all four filters must be explicitly set to "*"

client.delete_all(user_id="", agent_id="", app_id="", run_id="")

```javascript JavaScript
import MemoryClient from 'mem0ai';

const client = new MemoryClient({ apiKey: "your-api-key" });

// Delete all memories across every user in the project
client.deleteAll({ userId: "*" })
  .then(result => console.log(result))
  .catch(error => console.error(error));

// Full project wipe: all four filters must be explicitly set to "*"
client.deleteAll({ userId: "*", agentId: "*", appId: "*", runId: "*" })
  .then(result => console.log(result))
  .catch(error => console.error(error));

Delete with Mem0 OSS

memory = Memory()

memory.delete(memory_id="mem_123") memory.delete_all(user_id="alice")

```typescript TypeScript
import { Memory } from "mem0ai/oss";

const memory = new Memory();

await memory.delete("mem_123");
await memory.deleteAll({ userId: "alice" });

Use cases recap

• Forget a user’s preferences at their request.
• Remove outdated or incorrect facts before they spread.
• Clean up memories after session expiration or retention deadlines.
• Comply with privacy legislation (GDPR, CCPA) and internal policies.

Method comparison

Put it into practice

• Review the <Link href="/api-reference/memory/delete-memory">Delete Memory API reference</Link>, plus <Link href="/api-reference/memory/batch-delete">Batch Delete</Link> and <Link href="/api-reference/memory/delete-memories">Filtered Delete</Link>.
• Pair deletes with the <Link href="/api-reference/memory/update-memory">expiration date field</Link> to automate retention.

See it live

• <Link href="/cookbooks/operations/support-inbox">Support Inbox with Mem0</Link> demonstrates compliance-driven deletes.
• <Link href="/platform/features/direct-import">Data Management tooling</Link> shows how deletes fit into broader lifecycle flows.