Filtering Memories - supermemory | Memory API for the AI era

Supermemory provides two complementary filtering mechanisms that work independently or together to help you find exactly what you need.

How Filtering Works

Supermemory uses two types of filters for different purposes:

Container Tags

Organize memories into isolated spaces by user, project, or workspace

Metadata Filtering

Query memories by custom properties like category, status, or date

Both filtering types can be used:

Independently - Use container tags alone OR metadata filters alone
Together - Combine both for precise filtering (most common)

Think of it as: [Container Tags] → [Your Memories] ← [Metadata Filters]

Container Tags

Container tags create isolated memory spaces. They’re perfect for multi-tenant applications, user profiles, and project organization.

How Container Tags Work

Exact matching: Arrays must match exactly. A memory tagged with ["user_123", "project_ai"] will NOT match a search for just ["user_123"]
Isolation: Each container tag combination creates a separate knowledge graph
Naming patterns: Use consistent patterns like user_{id}, project_{id}, or org_{id}_team_{id}

Basic Usage

TypeScript
Python
cURL

// Search within a user's memories
const results = await client.search.documents({
  q: "machine learning notes",
  containerTags: ["user_123"],
  limit: 10
});

// Search within a project
const projectResults = await client.search.documents({
  q: "requirements",
  containerTags: ["project_ai"],
  limit: 10
});

Container Tag Patterns

Best Practice: Use single container tags when possible. Multi-tag arrays require exact matching, which can be restrictive.

Recommended Patterns

User isolation: user_{userId}
Project grouping: project_{projectId}
Workspace separation: workspace_{workspaceId}
Hierarchical: org_{orgId}_team_{teamId}
Temporal: user_{userId}_2024_q1

API Differences

Endpoint	Field Name	Type	Example
`/v3/search`	`containerTags`	Array	`["user_123"]`
`/v4/search`	`containerTag`	String	`"user_123"`
`/v3/documents/list`	`containerTags`	Array	`["user_123"]`

Metadata Filtering

Metadata filters let you query memories by any custom property. They use SQL-like AND/OR logic with explicit grouping.

Filter Structure

All metadata filters must be wrapped in AND or OR arrays:

// ✅ Correct - wrapped in AND array
filters: {
  AND: [
    { key: "category", value: "tech", negate: false }
  ]
}

// ❌ Wrong - not wrapped
filters: {
  key: "category", value: "tech", negate: false
}

Why Explicit Grouping?

Without explicit grouping, this SQL query is ambiguous:

category = 'tech' OR status = 'published' AND priority = 'high'

Our structure forces clarity:

// Clear: (category = 'tech') OR (status = 'published' AND priority = 'high')
{
  OR: [
    { key: "category", value: "tech" },
    { AND: [
      { key: "status", value: "published" },
      { key: "priority", value: "high" }
    ]}
  ]
}

Basic Metadata Filtering

TypeScript
Python
cURL

// Single condition
const results = await client.search.documents({
  q: "neural networks",
  filters: {
    AND: [
      { key: "category", value: "ai", negate: false }
    ]
  },
  limit: 10
});

// Multiple AND conditions
const filtered = await client.search.documents({
  q: "research",
  filters: {
    AND: [
      { key: "category", value: "science", negate: false },
      { key: "status", value: "published", negate: false },
      { key: "year", value: "2024", negate: false }
    ]
  },
  limit: 10
});

Filter Types in Detail

Supermemory supports four filter types, each designed for specific use cases.

1. String Equality (Default)

Exact string matching with optional case-insensitive comparison.

Basic
Case-Insensitive
Negation

// Case-sensitive exact match (default)
{
  key: "status",
  value: "Published",
  negate: false
}

2. String Contains

Search for substrings within text fields.

Basic
Case-Insensitive
Exclusion

// Find all documents containing "machine learning"
{
  filterType: "string_contains",
  key: "description",
  value: "machine learning",
  negate: false
}

3. Numeric Comparisons

Filter by numeric values with comparison operators.

Basic Operators
With Negation

// Greater than or equal
{
  filterType: "numeric",
  key: "score",
  value: "80",
  numericOperator: ">=",
  negate: false
}

// Less than
{
  filterType: "numeric",
  key: "readingTime",
  value: "10",
  numericOperator: "<",
  negate: false
}

Numeric Negation Mapping: When using negate: true with numeric filters, operators are reversed:

< → >=
<= → >
> → <=
>= → <
= → !=

4. Array Contains

Check if an array field contains a specific value.

Basic
Exclusion
Multiple Checks

// Find documents with specific participant
{
  filterType: "array_contains",
  key: "participants",
  value: "john.doe",
  negate: false
}

Common Patterns

Ready-to-use filtering patterns for common scenarios.

User-Specific Content with Category

TypeScript
Python

const results = await client.search.documents({
  q: "project updates",
  containerTags: ["user_123"],
  filters: {
    AND: [
      { key: "category", value: "work", negate: false },
      { key: "visibility", value: "private", negate: false }
    ]
  },
  limit: 10
});

Recent High-Priority Content

TypeScript
Python

const results = await client.search.documents({
  q: "important tasks",
  filters: {
    AND: [
      {
        filterType: "numeric",
        key: "priority",
        value: "7",
        numericOperator: ">=",
        negate: false
      },
      {
        filterType: "numeric",
        key: "created_timestamp",
        value: "1704067200", // 2024-01-01
        numericOperator: ">=",
        negate: false
      }
    ]
  },
  limit: 20
});

Team Collaboration Filter

TypeScript
Python

const results = await client.search.documents({
  q: "meeting notes",
  containerTags: ["project_alpha"],
  filters: {
    AND: [
      {
        OR: [
          {
            filterType: "array_contains",
            key: "participants",
            value: "alice"
          },
          {
            filterType: "array_contains",
            key: "participants",
            value: "bob"
          }
        ]
      },
      {
        key: "type",
        value: "meeting",
        negate: false
      }
    ]
  },
  limit: 15
});

Exclude Drafts and Deprecated Content

TypeScript
Python

const results = await client.search.documents({
  q: "documentation",
  filters: {
    AND: [
      {
        key: "status",
        value: "draft",
        negate: true  // Exclude drafts
      },
      {
        filterType: "string_contains",
        key: "content",
        value: "deprecated",
        negate: true  // Exclude deprecated
      },
      {
        filterType: "array_contains",
        key: "tags",
        value: "archived",
        negate: true  // Exclude archived
      }
    ]
  },
  limit: 10
});

API-Specific Notes

Different endpoints have slightly different requirements:

Endpoint	Container Tag Field	Type	Filter Format	Notes
`/v3/search`	`containerTags`	Array	JSON object	Document search
`/v4/search`	`containerTag`	String	JSON object	Memory search
`/v3/documents/list`	`containerTags`	Array	JSON string	Must use `JSON.stringify()`

List API Special Requirement: The /v3/documents/list endpoint requires filters as a JSON string:

// ✅ Correct for List API
filters: JSON.stringify({ AND: [...] })

// ❌ Wrong for List API (but correct for Search API)
filters: { AND: [...] }

Combining Container Tags and Metadata

Most real-world applications combine both filtering types for precise control.

Example: User’s Work Documents from 2024

TypeScript
Python

const results = await client.search.documents({
  q: "quarterly report",
  containerTags: ["user_123"],  // User isolation
  filters: {
    AND: [
      { key: "category", value: "work" },
      { key: "type", value: "report" },
      {
        filterType: "numeric",
        key: "year",
        value: "2024",
        numericOperator: "="
      }
    ]
  },
  limit: 10
});

Example: Project’s Active High-Priority Tasks

TypeScript
Python

const results = await client.search.documents({
  q: "implementation",
  containerTags: ["project_alpha"],  // Project isolation
  filters: {
    AND: [
      {
        key: "status",
        value: "completed",
        negate: true  // Not completed
      },
      {
        filterType: "numeric",
        key: "priority",
        value: "7",
        numericOperator: ">=",
        negate: false
      },
      {
        filterType: "array_contains",
        key: "assignees",
        value: "current_user"
      }
    ]
  },
  limit: 20
});

Document-Specific Search

Search within a single large document using the docId parameter:

TypeScript
Python

// Search within a specific book or manual
const results = await client.search.documents({
  q: "neural architecture",
  docId: "doc_textbook_ml_2024",
  limit: 20
});

Use this for:

Large textbooks or manuals
Multi-chapter books
Long podcast transcripts
Course materials

Validation & Limits

Metadata Key Requirements

Pattern: /^[a-zA-Z0-9_.-]+$/
Allowed: Letters, numbers, underscore, hyphen, dot
Max length: 64 characters
No spaces or special characters

Valid vs Invalid Keys

// ✅ Valid keys
"user_email"
"created-date"
"version.number"
"priority_level_2"

// ❌ Invalid keys
"user email"        // Spaces not allowed
"created@date"      // @ not allowed
"priority!"         // ! not allowed
"very_long_key_name_that_exceeds_64_characters_limit"  // Too long

Query Complexity Limits

Maximum conditions: 200 per query
Maximum nesting depth: 8 levels
Container tag arrays: Must match exactly

Troubleshooting

No Results Returned

Container tag mismatch

Problem: Container tags must match exactly as arrays.Solution: Verify the exact array structure. ["user_123"] ≠ ["user_123", "project_1"]

Wrong metadata key casing

Problem: Keys are case-sensitive by default.Solution: Check exact key spelling and casing, or use ignoreCase: true for values.

Incorrect negate value

Problem: Using negate: true when you meant false.Solution: Review your negate values. false = include, true = exclude.

Validation Errors

Invalid metadata key format

Error: “Invalid metadata key: contains unsafe characters”Solution: Remove spaces, special characters. Use only alphanumeric, underscore, hyphen, dot.

Filter structure error

Error: “Invalid filter structure”Solution: Ensure all conditions are wrapped in AND or OR arrays.

List API filter error

Error: “Invalid filter format”Solution: For /v3/documents/list, use JSON.stringify() on the filter object.

Performance Issues

Slow queries

Problem: Complex nested OR conditions with many branches.Solution: Simplify logic, reduce nesting, or split into multiple queries.

Hitting complexity limits

Problem: “Query exceeds maximum complexity”Solution: Reduce conditions (max 200) or nesting depth (max 8).

Getting Started

Memory API

Memory Router

Integrations with no-code tools

Migration Guides

Deployment

​How Filtering Works

Container Tags

Metadata Filtering

​Container Tags

​How Container Tags Work

​Basic Usage

​Container Tag Patterns

​Recommended Patterns

​API Differences

​Metadata Filtering

​Filter Structure

​Why Explicit Grouping?

​Basic Metadata Filtering

​Filter Types in Detail

​1. String Equality (Default)

​2. String Contains

​3. Numeric Comparisons

​4. Array Contains

​Common Patterns

​User-Specific Content with Category

​Recent High-Priority Content

​Team Collaboration Filter

​Exclude Drafts and Deprecated Content

​API-Specific Notes

​Combining Container Tags and Metadata

​Example: User’s Work Documents from 2024

​Example: Project’s Active High-Priority Tasks

​Document-Specific Search

​Validation & Limits

​Metadata Key Requirements

​Valid vs Invalid Keys

​Query Complexity Limits

​Troubleshooting

​No Results Returned

​Validation Errors

​Performance Issues

How Filtering Works

Container Tags

How Container Tags Work

Basic Usage

Container Tag Patterns

Recommended Patterns

API Differences

Metadata Filtering

Filter Structure

Why Explicit Grouping?

Basic Metadata Filtering

Filter Types in Detail

1. String Equality (Default)

2. String Contains

3. Numeric Comparisons

4. Array Contains

Common Patterns

User-Specific Content with Category

Recent High-Priority Content

Team Collaboration Filter

Exclude Drafts and Deprecated Content

API-Specific Notes

Combining Container Tags and Metadata

Example: User’s Work Documents from 2024

Example: Project’s Active High-Priority Tasks

Document-Specific Search

Validation & Limits

Metadata Key Requirements

Valid vs Invalid Keys

Query Complexity Limits

Troubleshooting

No Results Returned

Validation Errors

Performance Issues