Pricing

from $20.00 / 1,000 change event emitteds

Change Watcher - Push Events for Web and API Changes

Watches URLs with a CSS/XPath/regex selector or a JSONPath query, filters out timestamps, tokens, counters and other rendering noise, and emits a normalized change event only when the watched block really changed. No change, no event, no charge.

Pricing

from $20.00 / 1,000 change event emitteds

Rating

0.0

(0)

Developer

Ernest Marzá

Actor stats

Bookmarked

Total users

Monthly active users

a day ago

Last modified

Categories

Automation

Developer tools

Watchers

watchers

Required

One entry per watched target. Each entry accepts: url (required), selector, selectorType (css | xpath | regex | jsonpath | wholeBody), mode (text | json), extractAs (text | html), label, id, topic, method, headers, body, joinWith. Omit the selector to watch the whole body. A plain URL string is also accepted and means 'watch this whole page'. Maximum 50 entries per run.

Type:array

Stability window (consecutive checks)

stabilityChecks

Optional

How many consecutive checks a new value has to survive before it is reported. 1 fires on the first difference. 2 or 3 filters out A/B buckets, staggered cache invalidation and half-deployed clusters, which otherwise produce a change event every time the load balancer picks a different node.

Type:integer

Minimum:1

Maximum:10

Checks per run

checksPerRun

Optional

How many times each target is checked within a single run. Set it above 1 to close the stability window inside one run instead of across several scheduled runs. Note that the run stays alive for (checksPerRun - 1) x check interval, which costs compute.

Type:integer

Minimum:1

Maximum:20

Default:1

Seconds between checks in a run

checkIntervalSeconds

Optional

Only used when checks per run is greater than 1.

Type:integer

Minimum:1

Maximum:900

Default:30

Minimum change ratio (0-1)

minChangeRatio

Optional

Ignore differences smaller than this fraction of the block. 0 reports every difference that survives the noise filters. 0.02 means 'at least two percent of the block has to move'. Use it for targets with residual jitter the generic rules cannot catch, such as a rotating advert or a randomised testimonial.

Type:number

Minimum:0

Maximum:1

Default:0

Emit an event for the first observation

emitInitialState

Optional

By default the first time a target is seen it only records a baseline: there is nothing to compare against, so calling it a change would be noise. Turn this on to receive a 'created' event carrying the initial value, which is useful when the subscriber wants to seed its own copy.

Type:boolean

Default:false

Noise filters to apply

ignoreRules

Optional

Which parts of the anti-noise catalogue to run before hashing. Leave empty for the recommended set (everything except epoch masking). Available ids: unicode, jwt, isoTimestamp, httpDate, epochMillis, dateNumeric, dateTextual, clockTime, relativeTime, uuid, tokenAssignment, hexBlob, base64Blob, cacheBusting, trackingParams, viewCounters, whitespace.

Type:array

Extra patterns to ignore

customIgnorePatterns

Optional

Regular expressions applied after the catalogue; every match is replaced with . Both 'pattern' and '/pattern/flags' forms are accepted. The global flag is forced on.

Type:array

Case sensitive comparison

caseSensitive

Optional

Turn off to ignore changes that are only a difference in letter case.

Type:boolean

Default:true

Include the diff in every event

includeDiff

Optional

Adds added lines, removed lines, a unified diff and a similarity score to each event. Turning it off makes events smaller but leaves the subscriber to work out what moved.

Type:boolean

Default:true

Maximum characters per value

maxValueLength

Optional

Old and new values longer than this are truncated with an explicit marker. Guards against a watcher on a large page filling the dataset.

Type:integer

Minimum:100

Maximum:200000

Default:8000

Topic prefix

topicPrefix

Optional

Every event carries a topic built as prefix.host.label, for example change.example-com.pricing-table. Subscribers route on it without opening the payload. A per-watcher 'topic' field overrides it entirely.

Type:string

Default:change

State store name

stateStoreName

Optional

Named key-value store that holds the baseline between runs. This is what turns a series of one-shot runs into a watcher with a memory. Use different names to keep unrelated watch sets apart.

Type:string

Default:change-watcher-state

Reset stored state before this run

resetState

Optional

Drops the stored baseline for every watcher in this run and starts over. Use after changing the noise filters, since the old baseline was normalized with different rules.

Type:boolean

Default:false

Use conditional requests (ETag / If-Modified-Since)

useConditionalRequests

Optional

Sends the validators from the previous fetch so a server that supports them can answer 304 with no body at all. Much cheaper on targets that support it. Turn it off for servers that return misleading validators.

Type:boolean

Default:true

Request timeout (seconds)

requestTimeoutSecs

Optional

How long a single request may take before it is aborted and retried.

Type:integer

Minimum:5

Maximum:300

Default:30

Retries per check

maxRetries

Optional

Attempts before a check is recorded as failed. 5xx and timeouts are retried with backoff; 4xx is not, because it will not get better.

Type:integer

Minimum:1

Maximum:6

Default:3

User agent

userAgent

Optional

Sent with every request. Identify yourself honestly; some sites block generic agents.

Type:string

Default:Mozilla/5.0 (compatible; ApifyChangeWatcher/0.1; +https://apify.com)

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