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🔍Intermediate9 lessons · 3 free

Search for Builders

Learn to add professional search to any web application — from Postgres full-text search for simple use cases, to Typesense and Algolia for fuzzy matching, faceted filtering, and typo tolerance. Includes React search UI components and search analytics.

Basic SQL and React knowledge helpful but not required
Start free (3 free lessons)
$49one-time · lifetime access

What you'll learn

When Postgres full-text search is enough vs when to use a dedicated engine
Typesense: open-source, typo-tolerant search self-hosted or in the cloud
Algolia: hosted search with an instant-results React UI component
Faceted filtering, relevance scoring, and custom ranking rules
Building a search UI with instant results and keyboard navigation
Synonyms, stop words, and boosting rules for better relevance
Handling multi-language content in search indexes
Search analytics: what users search for and where they abandon

Course outline

Full course — $49 one-time

04

Faceted Search and Filtering

Multi-select filters that update counts and results in real time

11 min
05

Fuzzy Search and Typo Tolerance

Matching 'recieve' when users mean 'receive'

8 min
06

Algolia — The Managed Option

When to pay for managed search and how to set it up

9 min
07

Instant Search UI with React

Search box, hits, pagination, and refinements components

12 min
08

Geosearch and Location Queries

Search within a radius and sort by distance

9 min
09

Search Analytics

What users search for, what returns no results, and how to fix it

10 min

Get the full course

All 9 lessons. Ship search that actually works — instant results, typo tolerance, facets.

✓ Typesense + Algolia✓ Lifetime access✓ Certificate
$49one-time

Written by the RadarTrek editorial team · Reviewed June 2026

About this course

Search is one of the features most commonly requested by users and most commonly implemented badly by developers. The instinct is to reach for SQL LIKE queries — they are simple and already use your existing database. But LIKE queries are case-sensitive unless you use ILIKE, they do not handle typos, they do not rank results by relevance, and they perform full table scans that become unacceptably slow at tens of thousands of rows. The result is a search box that frustrates users and drives them away from the feature they asked for.

The right approach depends on your scale and complexity requirements. For applications with fewer than 100,000 documents, PostgreSQL's full-text search (tsvector, tsquery, GIN indexes) is often sufficient — it supports stemming, ranking, and multi-column search without any additional infrastructure. For applications that need typo tolerance, faceted filtering, geosearch, or instant-search UI, a dedicated search engine like Typesense (self-hosted, open-source) or Algolia (managed SaaS) is the right tool. This course teaches all three layers: Postgres FTS for simple cases, Typesense for self-hosted full-featured search, and Algolia for the managed option — along with React UI components for instant search experiences.

Frequently asked questions

What is full-text search and how is it different from a LIKE query?

A SQL LIKE query does substring matching — it scans every row looking for the exact string you provide, making it slow and inflexible. Full-text search works by pre-processing text into indexed tokens (removing stopwords, stemming "running" to "run"), which enables fast matching, relevance ranking, and language-aware searching. PostgreSQL's full-text search uses tsvector documents (pre-processed text) and tsquery expressions (search terms), indexed with GIN for performance. The result is faster queries, better relevance ranking, and support for natural language variations.

When should I use Typesense vs Algolia vs Postgres full-text search?

Use Postgres FTS when: your dataset is small to medium (under 100k documents), you want to avoid additional infrastructure, and your search requirements are modest. Use Typesense when: you need typo tolerance, faceted filtering, geosearch, or instant-search speed, and you are comfortable self-hosting via Docker. Use Algolia when: you want a fully managed service with zero infrastructure management, are building an e-commerce or content site with heavy search requirements, or need their advanced UI component library. Typesense and Algolia have similar capabilities; the choice is usually managed vs self-hosted.

What is typo tolerance and why does it matter?

Typo tolerance means returning relevant results even when users misspell their query. A user searching for "recieve" should find results for "receive". Standard SQL queries and basic full-text search do not handle this — they match text exactly. Dedicated search engines like Typesense and Algolia calculate edit distance between the query and indexed terms, allowing matches that are one or two characters different. This dramatically improves search quality, particularly on mobile where typing errors are common.

What is faceted search?

Faceted search lets users filter results by multiple categories simultaneously — the way Amazon lets you filter by brand, price range, rating, and delivery time at the same time, with counts updating for each combination. Implementing faceted search with SQL requires complex GROUP BY queries that become slow as data grows. Dedicated search engines maintain pre-computed facet counts in their index, returning filters and counts in a single fast query. Typesense and Algolia both have native faceting support that renders in React with their UI component libraries.

How do I keep my search index in sync with my database?

Search indexes are a denormalised copy of your database data, so they need to be updated when the source data changes. The three main patterns are: 1) Synchronous indexing — call the search API immediately after writing to the database in the same request (simple but adds latency and risks partial failures). 2) Webhook/event-driven indexing — trigger index updates from database webhooks or Supabase Realtime events. 3) Background job indexing — queue index update jobs via BullMQ or similar after each write. For most applications, synchronous indexing with retry logic is sufficient to start.

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