Exa Known Pitfalls

Prerequisites

• A defined research/search task, approved data classification, current policy/rules, and a non-sensitive evaluation query.

Instructions

1. Identify the relevant pitfall before accepting a search result, changing retrieval settings, or automating an action.
2. Constrain source domain, recency, data, and output expectations, then validate citations and policy requirements.
3. Record recurring failures in reviewed guidance and keep sensitive queries/outputs out of diagnostics.

Output

• A documented prevention or remediation for a specific retrieval, data, policy, or automation risk.

Error Handling

Examples

For a compliance research task, constrain Exa to approved primary domains and date range, inspect each result/citation, and retain only the summarized, non-sensitive evidence. Reject results that lack support rather than widening the query into private data.

Overview

Real gotchas when integrating Exa's neural search API. Exa uses embeddings-based search rather than keyword matching, which creates a different class of failure modes than traditional search APIs. This skill covers the top pitfalls with wrong/right examples.

Pitfall 1: Keyword-Style Queries

Exa's neural search interprets natural language semantically. Boolean operators and keyword syntax degrade results.

import Exa from "exa-js";
const exa = new Exa(process.env.EXA_API_KEY);

// BAD: keyword/boolean style — Exa ignores AND/OR
const bad = await exa.search(
  "python AND machine learning OR deep learning 2024"
);

// GOOD: natural language statement
const good = await exa.search(
  "recent tutorials on building ML models with Python",
  { type: "neural", numResults: 10 }
);

Pitfall 2: Wrong Search Type

Using neural search for exact lookups (URLs, names) or keyword search for conceptual queries silently degrades quality.

// BAD: neural search for a specific URL/identifier
const bad = await exa.search("arxiv.org/abs/2301.00001", { type: "neural" });

// GOOD: keyword for exact terms, neural for concepts
const exactMatch = await exa.search("arxiv.org/abs/2301.00001", {
  type: "keyword",
});
const conceptual = await exa.search(
  "transformer architecture improvements for long context",
  { type: "neural" }
);

Pitfall 3: Expecting Content from search()

search() returns metadata only (URL, title, score). Content requires searchAndContents() or getContents().

// BAD: accessing .text from search() — it's undefined
const results = await exa.search("AI safety research");
const text = results.results[0].text;  // undefined!

// GOOD: use searchAndContents for text/highlights
const withContent = await exa.searchAndContents("AI safety research", {
  numResults: 5,
  text: { maxCharacters: 2000 },
  highlights: { maxCharacters: 500 },
});
console.log(withContent.results[0].text);       // actual content
console.log(withContent.results[0].highlights);  // key excerpts

Pitfall 4: Narrow Date Filters Return Empty

Date filters silently exclude results. A single-day window often returns nothing without error.

// BAD: too narrow, likely returns empty array
const bad = await exa.search("AI news", {
  startPublishedDate: "2025-03-15T00:00:00.000Z",
  endPublishedDate: "2025-03-15T23:59:59.000Z",
});

// GOOD: reasonable window with fallback
let results = await exa.search("AI news", {
  startPublishedDate: "2025-03-01T00:00:00.000Z",
  endPublishedDate: "2025-03-31T23:59:59.000Z",
  numResults: 10,
});
// Fallback if no results
if (results.results.length === 0) {
  results = await exa.search("AI news", { numResults: 10 });
}

Pitfall 5: findSimilar Takes a URL, Not a Query

findSimilar expects a URL as its first argument. Passing a query string gives meaningless results.

// BAD: passing a query string to findSimilar
const bad = await exa.findSimilar("machine learning research papers");

// GOOD: pass a URL — findSimilar finds pages semantically similar to it
const good = await exa.findSimilar("https://arxiv.org/abs/2301.00001", {
  numResults: 10,
  excludeSourceDomain: true,
});

Pitfall 6: Date Filters with company/people Categories

The company and people categories do NOT support date filters. Using them returns a 400 error.

// BAD: date filter with company category → 400 error
const bad = await exa.search("AI startups", {
  category: "company",
  startPublishedDate: "2024-01-01T00:00:00.000Z",  // not supported!
});

// GOOD: company search without date filters
const good = await exa.search("AI startups", {
  category: "company",
  numResults: 10,
});

Pitfall 7: Not Limiting Content Size

Requesting full text without maxCharacters can return massive payloads, increasing latency and cost.

// BAD: unlimited text retrieval
const bad = await exa.searchAndContents("topic", {
  numResults: 20,
  text: true,  // could return megabytes of content
});

// GOOD: limit content size
const good = await exa.searchAndContents("topic", {
  numResults: 10,
  text: { maxCharacters: 2000 },  // cap at 2000 chars per result
  highlights: { maxCharacters: 500 },
});

Pitfall 8: Creating New Client Per Request

Each new Exa() call creates a new HTTP client. Reuse a singleton for connection pooling.

// BAD: new client every request (in a route handler)
app.get("/search", async (req, res) => {
  const exa = new Exa(process.env.EXA_API_KEY);  // wasteful!
  const results = await exa.search(req.query.q);
  res.json(results);
});

// GOOD: singleton client
const exa = new Exa(process.env.EXA_API_KEY);
app.get("/search", async (req, res) => {
  const results = await exa.search(req.query.q);
  res.json(results);
});

Pitfall 9: Ignoring the requestId in Errors

Exa error responses include requestId for support debugging. Always log it.

// BAD: generic error handling
try {
  await exa.search("query");
} catch (err) {
  console.error("Search failed");  // loses diagnostic info
}

// GOOD: capture requestId
try {
  await exa.search("query");
} catch (err: any) {
  console.error("Search failed:", {
    status: err.status,
    message: err.message,
    requestId: err.requestId,  // include when contacting support
    tag: err.error_tag,
  });
}

Quick Review Checklist

• [ ] Queries are natural language, not keyword/boolean syntax
• [ ] Search type matches the query intent (neural vs keyword)
• [ ] Using searchAndContents when page content is needed
• [ ] Date filter windows are wide enough (7+ days)
• [ ] findSimilar receives URLs, not query strings
• [ ] No date filters on company or people categories
• [ ] maxCharacters set on text and highlights
• [ ] Exa client is a singleton, not created per request
• [ ] Error handling captures requestId

Resources

• Exa Search Reference
• Exa Error Codes
• Exa Contents Retrieval

Next Steps

For SDK patterns, see exa-sdk-patterns. For common errors, see exa-common-errors.