HAR Analyzer

Token-efficient HAR analysis. Uses a reference system - large data shown once gets a ref ID, subsequent views show [ref:ID] + preview instead of repeating.

Critical Rule

NEVER cat, jq, or directly read a HAR file. Always use tools har-analyzer commands. Raw HAR reading wastes 10-100x more tokens.

Optimal Workflow

1. tools har-analyzer load <file.har>     # Parse + dashboard (always start here)
2. tools har-analyzer list --status 4xx   # Filter to what matters
3. tools har-analyzer domain <domain>     # Drill into specific API
4. tools har-analyzer show e14            # Detail for one entry
5. tools har-analyzer show e14 --raw      # Full body/headers if needed
6. tools har-analyzer expand e14.rs.body  # Re-show a referenced value

Command Reference

Command	Purpose	Key Options
load <file>	Parse HAR, show dashboard
dashboard	Re-show overview stats
list	Compact entry table	--domain --status --method --url --limit
show <eN>	Entry detail (L2)	--raw --section body|headers|cookies
expand <ref>	Show full referenced data	--schema [skeleton|typescript|schema]
domains	List domains with stats
domain <name>	Drill-down: paths + body previews	--status --method
search <query>	Grep across entries	--scope url|body|header|all
errors	4xx/5xx focus with body previews
waterfall	ASCII timing chart	--domain --limit
security	Find JWT, API keys, insecure cookies
size	Bandwidth breakdown by type
headers	Deduplicated header analysis	--scope request|response|both
redirects	Redirect chain tracking
cookies	Cookie flow (set/sent tracking)
diff <e1> <e2>	Compare two entries
export	Export filtered HAR subset	--sanitize --strip-bodies -o file

Global Options

Flag	Purpose
--format md|json|toon	Output format (default: md)
--full	Bypass ref system, show everything
--include-all	Show CSS/JS/image/font bodies (skipped by default)

Reference System

• Data >200 chars gets a ref ID on first show: [ref:e14.rs.body] {"users":[...]}
• Same data in later commands shows: [ref:e14.rs.body] {"users":[{"id":1,... (1.8KB)
• Use expand <refId> to see full content again
• Ref format: e{N}.{rq|rs}.{body|headers|cookies}
• --full flag bypasses refs entirely

Content Skipping

By default, bodies of static assets are skipped (CSS, JS, images, fonts, WASM). Only JSON, HTML, XML, and plain text bodies are shown. Use --include-all to override.

Common Patterns

Understand API shape before expanding full body (token-efficient!):

tools har-analyzer expand e14.rs.body --schema            # compact skeleton
tools har-analyzer expand e14.rs.body --schema typescript  # TS interfaces
tools har-analyzer expand e14.rs.body                      # full content only if needed

Debug API errors:

tools har-analyzer load capture.har
tools har-analyzer errors                    # See all 4xx/5xx
tools har-analyzer show e14 --raw            # Full error response

Analyze specific API:

tools har-analyzer domain api.example.com    # All requests to that domain
tools har-analyzer domain api.example.com --status 4xx

Find sensitive data:

tools har-analyzer security                  # JWT, API keys, insecure cookies

Compare working vs failing request:

tools har-analyzer diff e5 e14               # Side-by-side comparison

MCP Server

If configured as MCP server (tools har-analyzer mcp), use MCP tools directly: har_load, har_overview, har_list, har_detail, har_expand, har_search, har_analyze, har_flow, har_diff, har_export